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Research Paper: A step-by-step guide: 3. Thesis Statement & Outline

  • 1. Getting Started
  • 2. Topic Ideas
  • 3. Thesis Statement & Outline
  • 4. Appropriate Sources
  • 5. Search Techniques
  • 6. Taking Notes & Documenting Sources
  • 7. Evaluating Sources
  • 8. Citations & Plagiarism
  • 9. Writing Your Research Paper

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About Thesis Statements

Qualities of a thesis statement.

Thesis statements:

  • state the subject matter and main ideas of a paper.
  • appear in the first paragraph and announces what you will discuss in your paper.
  • define the scope and focus of your essay, and tells your reader what to expect.  
  • are not a simple factual statement.  It is an assertion that states your claims and that you can prove with evidence.
  • should be the product of research and your own critical thinking.
  • can be very helpful in constructing an outline for your essay; for each point you make, ask yourself whether it is relevant to the thesis.

Steps you can use to create a thesis statement

1. Start out with the main topic and focus of your essay.

youth gangs + prevention and intervention programs

2. Make a claim or argument in one sentence.  It can be helpful to start with a question which you then turn into an argument

Can prevention and intervention programs stop youth gang activities?  How?  ►►►  "Prevention and intervention programs can stop youth gang activities by giving teens something else to do."

3. Revise the sentence by using specific terms.

"Early prevention programs in schools are the most effective way to prevent youth gang involvement by giving teens good activities that offer a path to success."

4. Further revise the sentence to cover the scope of your essay and make a strong statement.

"Among various prevention and intervention efforts that have been made to deal with the rapid growth of youth gangs, early school-based prevention programs are the most effective way to prevent youth gang involvement, which they do by giving teens meaningful activities that offer pathways to achievement and success."

5. Keep your thesis statement flexible and revise it as needed. In the process of researching and writing, you may find new information or refine your understanding of the topic.

You can view this short video for more tips on how to write a clear thesis statement.

An outline is the skeleton of your essay, in which you list the arguments and subtopics in a logical order. A good outline is an important element in writing a good paper. An outline helps to target your research areas, keep you within the scope without going off-track, and it can also help to keep your argument in good order when writing the essay.  Once your outline is in good shape, it is much easier to write your paper; you've already done most of the thinking, so you just need to fill in the outline with a paragraph for each point.

To write an outline: The most common way to write an outline is the list format.  List all the major topics and subtopics with the key points that support them. Put similar topics and points together and arrange them in a logical order.    Include an introduction, a body, and a conclusion. 

A list outline should arrange the main points or arguments in a hierarchical structure indicated by Roman numerals for main ideas (I, II, III...), capital letters for subtopics (A, B, C...), Arabic numerals for details (1,2,3...), and lower-case letters for fine details if needed (a,b,c...). This helps keep things organized.  

Here is a shortened example of an outline:

Introduction: background and thesis statement

I. First topic

1. Supporting evidence 2. Supporting evidence

II. Second Topic

III. Third Topic

I. Summarize the main points of your paper II. Restate your thesis in different words III. Make a strong final statement

You can see examples of a few different kinds of outlines and get more help at the Purdue OWL .

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What is a thesis | A Complete Guide with Examples

Madalsa

Table of Contents

A thesis is a comprehensive academic paper based on your original research that presents new findings, arguments, and ideas of your study. It’s typically submitted at the end of your master’s degree or as a capstone of your bachelor’s degree.

However, writing a thesis can be laborious, especially for beginners. From the initial challenge of pinpointing a compelling research topic to organizing and presenting findings, the process is filled with potential pitfalls.

Therefore, to help you, this guide talks about what is a thesis. Additionally, it offers revelations and methodologies to transform it from an overwhelming task to a manageable and rewarding academic milestone.

What is a thesis?

A thesis is an in-depth research study that identifies a particular topic of inquiry and presents a clear argument or perspective about that topic using evidence and logic.

Writing a thesis showcases your ability of critical thinking, gathering evidence, and making a compelling argument. Integral to these competencies is thorough research, which not only fortifies your propositions but also confers credibility to your entire study.

Furthermore, there's another phenomenon you might often confuse with the thesis: the ' working thesis .' However, they aren't similar and shouldn't be used interchangeably.

A working thesis, often referred to as a preliminary or tentative thesis, is an initial version of your thesis statement. It serves as a draft or a starting point that guides your research in its early stages.

As you research more and gather more evidence, your initial thesis (aka working thesis) might change. It's like a starting point that can be adjusted as you learn more. It's normal for your main topic to change a few times before you finalize it.

While a thesis identifies and provides an overarching argument, the key to clearly communicating the central point of that argument lies in writing a strong thesis statement.

What is a thesis statement?

A strong thesis statement (aka thesis sentence) is a concise summary of the main argument or claim of the paper. It serves as a critical anchor in any academic work, succinctly encapsulating the primary argument or main idea of the entire paper.

Typically found within the introductory section, a strong thesis statement acts as a roadmap of your thesis, directing readers through your arguments and findings. By delineating the core focus of your investigation, it offers readers an immediate understanding of the context and the gravity of your study.

Furthermore, an effectively crafted thesis statement can set forth the boundaries of your research, helping readers anticipate the specific areas of inquiry you are addressing.

Different types of thesis statements

A good thesis statement is clear, specific, and arguable. Therefore, it is necessary for you to choose the right type of thesis statement for your academic papers.

Thesis statements can be classified based on their purpose and structure. Here are the primary types of thesis statements:

Argumentative (or Persuasive) thesis statement

Purpose : To convince the reader of a particular stance or point of view by presenting evidence and formulating a compelling argument.

Example : Reducing plastic use in daily life is essential for environmental health.

Analytical thesis statement

Purpose : To break down an idea or issue into its components and evaluate it.

Example : By examining the long-term effects, social implications, and economic impact of climate change, it becomes evident that immediate global action is necessary.

Expository (or Descriptive) thesis statement

Purpose : To explain a topic or subject to the reader.

Example : The Great Depression, spanning the 1930s, was a severe worldwide economic downturn triggered by a stock market crash, bank failures, and reduced consumer spending.

Cause and effect thesis statement

Purpose : To demonstrate a cause and its resulting effect.

Example : Overuse of smartphones can lead to impaired sleep patterns, reduced face-to-face social interactions, and increased levels of anxiety.

Compare and contrast thesis statement

Purpose : To highlight similarities and differences between two subjects.

Example : "While both novels '1984' and 'Brave New World' delve into dystopian futures, they differ in their portrayal of individual freedom, societal control, and the role of technology."

When you write a thesis statement , it's important to ensure clarity and precision, so the reader immediately understands the central focus of your work.

What is the difference between a thesis and a thesis statement?

While both terms are frequently used interchangeably, they have distinct meanings.

A thesis refers to the entire research document, encompassing all its chapters and sections. In contrast, a thesis statement is a brief assertion that encapsulates the central argument of the research.

Here’s an in-depth differentiation table of a thesis and a thesis statement.

Aspect

Thesis

Thesis Statement

Definition

An extensive document presenting the author's research and findings, typically for a degree or professional qualification.

A concise sentence or two in an essay or research paper that outlines the main idea or argument.  

Position

It’s the entire document on its own.

Typically found at the end of the introduction of an essay, research paper, or thesis.

Components

Introduction, methodology, results, conclusions, and bibliography or references.

Doesn't include any specific components

Purpose

Provides detailed research, presents findings, and contributes to a field of study. 

To guide the reader about the main point or argument of the paper or essay.

Now, to craft a compelling thesis, it's crucial to adhere to a specific structure. Let’s break down these essential components that make up a thesis structure

15 components of a thesis structure

Navigating a thesis can be daunting. However, understanding its structure can make the process more manageable.

Here are the key components or different sections of a thesis structure:

Your thesis begins with the title page. It's not just a formality but the gateway to your research.

title-page-of-a-thesis

Here, you'll prominently display the necessary information about you (the author) and your institutional details.

  • Title of your thesis
  • Your full name
  • Your department
  • Your institution and degree program
  • Your submission date
  • Your Supervisor's name (in some cases)
  • Your Department or faculty (in some cases)
  • Your University's logo (in some cases)
  • Your Student ID (in some cases)

In a concise manner, you'll have to summarize the critical aspects of your research in typically no more than 200-300 words.

Abstract-section-of-a-thesis

This includes the problem statement, methodology, key findings, and conclusions. For many, the abstract will determine if they delve deeper into your work, so ensure it's clear and compelling.

Acknowledgments

Research is rarely a solitary endeavor. In the acknowledgments section, you have the chance to express gratitude to those who've supported your journey.

Acknowledgement-section-of-a-thesis

This might include advisors, peers, institutions, or even personal sources of inspiration and support. It's a personal touch, reflecting the humanity behind the academic rigor.

Table of contents

A roadmap for your readers, the table of contents lists the chapters, sections, and subsections of your thesis.

Table-of-contents-of-a-thesis

By providing page numbers, you allow readers to navigate your work easily, jumping to sections that pique their interest.

List of figures and tables

Research often involves data, and presenting this data visually can enhance understanding. This section provides an organized listing of all figures and tables in your thesis.

List-of-tables-and-figures-in-a-thesis

It's a visual index, ensuring that readers can quickly locate and reference your graphical data.

Introduction

Here's where you introduce your research topic, articulate the research question or objective, and outline the significance of your study.

Introduction-section-of-a-thesis

  • Present the research topic : Clearly articulate the central theme or subject of your research.
  • Background information : Ground your research topic, providing any necessary context or background information your readers might need to understand the significance of your study.
  • Define the scope : Clearly delineate the boundaries of your research, indicating what will and won't be covered.
  • Literature review : Introduce any relevant existing research on your topic, situating your work within the broader academic conversation and highlighting where your research fits in.
  • State the research Question(s) or objective(s) : Clearly articulate the primary questions or objectives your research aims to address.
  • Outline the study's structure : Give a brief overview of how the subsequent sections of your work will unfold, guiding your readers through the journey ahead.

The introduction should captivate your readers, making them eager to delve deeper into your research journey.

Literature review section

Your study correlates with existing research. Therefore, in the literature review section, you'll engage in a dialogue with existing knowledge, highlighting relevant studies, theories, and findings.

Literature-review-section-thesis

It's here that you identify gaps in the current knowledge, positioning your research as a bridge to new insights.

To streamline this process, consider leveraging AI tools. For example, the SciSpace literature review tool enables you to efficiently explore and delve into research papers, simplifying your literature review journey.

Methodology

In the research methodology section, you’ll detail the tools, techniques, and processes you employed to gather and analyze data. This section will inform the readers about how you approached your research questions and ensures the reproducibility of your study.

Methodology-section-thesis

Here's a breakdown of what it should encompass:

  • Research Design : Describe the overall structure and approach of your research. Are you conducting a qualitative study with in-depth interviews? Or is it a quantitative study using statistical analysis? Perhaps it's a mixed-methods approach?
  • Data Collection : Detail the methods you used to gather data. This could include surveys, experiments, observations, interviews, archival research, etc. Mention where you sourced your data, the duration of data collection, and any tools or instruments used.
  • Sampling : If applicable, explain how you selected participants or data sources for your study. Discuss the size of your sample and the rationale behind choosing it.
  • Data Analysis : Describe the techniques and tools you used to process and analyze the data. This could range from statistical tests in quantitative research to thematic analysis in qualitative research.
  • Validity and Reliability : Address the steps you took to ensure the validity and reliability of your findings to ensure that your results are both accurate and consistent.
  • Ethical Considerations : Highlight any ethical issues related to your research and the measures you took to address them, including — informed consent, confidentiality, and data storage and protection measures.

Moreover, different research questions necessitate different types of methodologies. For instance:

  • Experimental methodology : Often used in sciences, this involves a controlled experiment to discern causality.
  • Qualitative methodology : Employed when exploring patterns or phenomena without numerical data. Methods can include interviews, focus groups, or content analysis.
  • Quantitative methodology : Concerned with measurable data and often involves statistical analysis. Surveys and structured observations are common tools here.
  • Mixed methods : As the name implies, this combines both qualitative and quantitative methodologies.

The Methodology section isn’t just about detailing the methods but also justifying why they were chosen. The appropriateness of the methods in addressing your research question can significantly impact the credibility of your findings.

Results (or Findings)

This section presents the outcomes of your research. It's crucial to note that the nature of your results may vary; they could be quantitative, qualitative, or a mix of both.

Results-section-thesis

Quantitative results often present statistical data, showcasing measurable outcomes, and they benefit from tables, graphs, and figures to depict these data points.

Qualitative results , on the other hand, might delve into patterns, themes, or narratives derived from non-numerical data, such as interviews or observations.

Regardless of the nature of your results, clarity is essential. This section is purely about presenting the data without offering interpretations — that comes later in the discussion.

In the discussion section, the raw data transforms into valuable insights.

Start by revisiting your research question and contrast it with the findings. How do your results expand, constrict, or challenge current academic conversations?

Dive into the intricacies of the data, guiding the reader through its implications. Detail potential limitations transparently, signaling your awareness of the research's boundaries. This is where your academic voice should be resonant and confident.

Practical implications (Recommendation) section

Based on the insights derived from your research, this section provides actionable suggestions or proposed solutions.

Whether aimed at industry professionals or the general public, recommendations translate your academic findings into potential real-world actions. They help readers understand the practical implications of your work and how it can be applied to effect change or improvement in a given field.

When crafting recommendations, it's essential to ensure they're feasible and rooted in the evidence provided by your research. They shouldn't merely be aspirational but should offer a clear path forward, grounded in your findings.

The conclusion provides closure to your research narrative.

It's not merely a recap but a synthesis of your main findings and their broader implications. Reconnect with the research questions or hypotheses posited at the beginning, offering clear answers based on your findings.

Conclusion-section-thesis

Reflect on the broader contributions of your study, considering its impact on the academic community and potential real-world applications.

Lastly, the conclusion should leave your readers with a clear understanding of the value and impact of your study.

References (or Bibliography)

Every theory you've expounded upon, every data point you've cited, and every methodological precedent you've followed finds its acknowledgment here.

References-section-thesis

In references, it's crucial to ensure meticulous consistency in formatting, mirroring the specific guidelines of the chosen citation style .

Proper referencing helps to avoid plagiarism , gives credit to original ideas, and allows readers to explore topics of interest. Moreover, it situates your work within the continuum of academic knowledge.

To properly cite the sources used in the study, you can rely on online citation generator tools  to generate accurate citations!

Here’s more on how you can cite your sources.

Often, the depth of research produces a wealth of material that, while crucial, can make the core content of the thesis cumbersome. The appendix is where you mention extra information that supports your research but isn't central to the main text.

Appendices-section-thesis

Whether it's raw datasets, detailed procedural methodologies, extended case studies, or any other ancillary material, the appendices ensure that these elements are archived for reference without breaking the main narrative's flow.

For thorough researchers and readers keen on meticulous details, the appendices provide a treasure trove of insights.

Glossary (optional)

In academics, specialized terminologies, and jargon are inevitable. However, not every reader is versed in every term.

The glossary, while optional, is a critical tool for accessibility. It's a bridge ensuring that even readers from outside the discipline can access, understand, and appreciate your work.

Glossary-section-of-a-thesis

By defining complex terms and providing context, you're inviting a wider audience to engage with your research, enhancing its reach and impact.

Remember, while these components provide a structured framework, the essence of your thesis lies in the originality of your ideas, the rigor of your research, and the clarity of your presentation.

As you craft each section, keep your readers in mind, ensuring that your passion and dedication shine through every page.

Thesis examples

To further elucidate the concept of a thesis, here are illustrative examples from various fields:

Example 1 (History): Abolition, Africans, and Abstraction: the Influence of the ‘Noble Savage’ on British and French Antislavery Thought, 1787-1807 by Suchait Kahlon.
Example 2 (Climate Dynamics): Influence of external forcings on abrupt millennial-scale climate changes: a statistical modelling study by Takahito Mitsui · Michel Crucifix

Checklist for your thesis evaluation

Evaluating your thesis ensures that your research meets the standards of academia. Here's an elaborate checklist to guide you through this critical process.

Content and structure

  • Is the thesis statement clear, concise, and debatable?
  • Does the introduction provide sufficient background and context?
  • Is the literature review comprehensive, relevant, and well-organized?
  • Does the methodology section clearly describe and justify the research methods?
  • Are the results/findings presented clearly and logically?
  • Does the discussion interpret the results in light of the research question and existing literature?
  • Is the conclusion summarizing the research and suggesting future directions or implications?

Clarity and coherence

  • Is the writing clear and free of jargon?
  • Are ideas and sections logically connected and flowing?
  • Is there a clear narrative or argument throughout the thesis?

Research quality

  • Is the research question significant and relevant?
  • Are the research methods appropriate for the question?
  • Is the sample size (if applicable) adequate?
  • Are the data analysis techniques appropriate and correctly applied?
  • Are potential biases or limitations addressed?

Originality and significance

  • Does the thesis contribute new knowledge or insights to the field?
  • Is the research grounded in existing literature while offering fresh perspectives?

Formatting and presentation

  • Is the thesis formatted according to institutional guidelines?
  • Are figures, tables, and charts clear, labeled, and referenced in the text?
  • Is the bibliography or reference list complete and consistently formatted?
  • Are appendices relevant and appropriately referenced in the main text?

Grammar and language

  • Is the thesis free of grammatical and spelling errors?
  • Is the language professional, consistent, and appropriate for an academic audience?
  • Are quotations and paraphrased material correctly cited?

Feedback and revision

  • Have you sought feedback from peers, advisors, or experts in the field?
  • Have you addressed the feedback and made the necessary revisions?

Overall assessment

  • Does the thesis as a whole feel cohesive and comprehensive?
  • Would the thesis be understandable and valuable to someone in your field?

Ensure to use this checklist to leave no ground for doubt or missed information in your thesis.

After writing your thesis, the next step is to discuss and defend your findings verbally in front of a knowledgeable panel. You’ve to be well prepared as your professors may grade your presentation abilities.

Preparing your thesis defense

A thesis defense, also known as "defending the thesis," is the culmination of a scholar's research journey. It's the final frontier, where you’ll present their findings and face scrutiny from a panel of experts.

Typically, the defense involves a public presentation where you’ll have to outline your study, followed by a question-and-answer session with a committee of experts. This committee assesses the validity, originality, and significance of the research.

The defense serves as a rite of passage for scholars. It's an opportunity to showcase expertise, address criticisms, and refine arguments. A successful defense not only validates the research but also establishes your authority as a researcher in your field.

Here’s how you can effectively prepare for your thesis defense .

Now, having touched upon the process of defending a thesis, it's worth noting that scholarly work can take various forms, depending on academic and regional practices.

One such form, often paralleled with the thesis, is the 'dissertation.' But what differentiates the two?

Dissertation vs. Thesis

Often used interchangeably in casual discourse, they refer to distinct research projects undertaken at different levels of higher education.

To the uninitiated, understanding their meaning might be elusive. So, let's demystify these terms and delve into their core differences.

Here's a table differentiating between the two.

Aspect

Thesis

Dissertation

Purpose

Often for a master's degree, showcasing a grasp of existing research

Primarily for a doctoral degree, contributing new knowledge to the field

Length

100 pages, focusing on a specific topic or question.

400-500 pages, involving deep research and comprehensive findings

Research Depth

Builds upon existing research

Involves original and groundbreaking research

Advisor's Role

Guides the research process

Acts more as a consultant, allowing the student to take the lead

Outcome

Demonstrates understanding of the subject

Proves capability to conduct independent and original research

Wrapping up

From understanding the foundational concept of a thesis to navigating its various components, differentiating it from a dissertation, and recognizing the importance of proper citation — this guide covers it all.

As scholars and readers, understanding these nuances not only aids in academic pursuits but also fosters a deeper appreciation for the relentless quest for knowledge that drives academia.

It’s important to remember that every thesis is a testament to curiosity, dedication, and the indomitable spirit of discovery.

Good luck with your thesis writing!

Frequently Asked Questions

A thesis typically ranges between 40-80 pages, but its length can vary based on the research topic, institution guidelines, and level of study.

A PhD thesis usually spans 200-300 pages, though this can vary based on the discipline, complexity of the research, and institutional requirements.

To identify a thesis topic, consider current trends in your field, gaps in existing literature, personal interests, and discussions with advisors or mentors. Additionally, reviewing related journals and conference proceedings can provide insights into potential areas of exploration.

The conceptual framework is often situated in the literature review or theoretical framework section of a thesis. It helps set the stage by providing the context, defining key concepts, and explaining the relationships between variables.

A thesis statement should be concise, clear, and specific. It should state the main argument or point of your research. Start by pinpointing the central question or issue your research addresses, then condense that into a single statement, ensuring it reflects the essence of your paper.

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How to Write a Solid Thesis Statement

The important sentence expresses your central assertion or argument

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A thesis statement provides the foundation for your entire research paper or essay. This statement is the central assertion that you want to express in your essay. A successful thesis statement is one that is made up of one or two sentences clearly laying out your central idea and expressing an informed, reasoned answer to your research question.

Usually, the thesis statement will appear at the end of the first paragraph of your paper. There are a few different types, and the content of your thesis statement will depend upon the type of paper you’re writing.

Key Takeaways: Writing a Thesis Statement

  • A thesis statement gives your reader a preview of your paper's content by laying out your central idea and expressing an informed, reasoned answer to your research question.
  • Thesis statements will vary depending on the type of paper you are writing, such as an expository essay, argument paper, or analytical essay.
  • Before creating a thesis statement, determine whether you are defending a stance, giving an overview of an event, object, or process, or analyzing your subject

Expository Essay Thesis Statement Examples

An expository essay "exposes" the reader to a new topic; it informs the reader with details, descriptions, or explanations of a subject. If you are writing an expository essay , your thesis statement should explain to the reader what she will learn in your essay. For example:

  • The United States spends more money on its military budget than all the industrialized nations combined.
  • Gun-related homicides and suicides are increasing after years of decline.
  • Hate crimes have increased three years in a row, according to the FBI.
  • Post-traumatic stress disorder (PTSD) increases the risk of stroke and arterial fibrillation (irregular heartbeat).

These statements provide a statement of fact about the topic (not just opinion) but leave the door open for you to elaborate with plenty of details. In an expository essay, you don't need to develop an argument or prove anything; you only need to understand your topic and present it in a logical manner. A good thesis statement in an expository essay always leaves the reader wanting more details.

Types of Thesis Statements

Before creating a thesis statement, it's important to ask a few basic questions, which will help you determine the kind of essay or paper you plan to create:

  • Are you defending a stance in a controversial essay ?
  • Are you simply giving an overview or describing an event, object, or process?
  • Are you conducting an analysis of an event, object, or process?

In every thesis statement , you will give the reader a preview of your paper's content, but the message will differ a little depending on the essay type .

Argument Thesis Statement Examples

If you have been instructed to take a stance on one side of a controversial issue, you will need to write an argument essay . Your thesis statement should express the stance you are taking and may give the reader a preview or a hint of your evidence. The thesis of an argument essay could look something like the following:

  • Self-driving cars are too dangerous and should be banned from the roadways.
  • The exploration of outer space is a waste of money; instead, funds should go toward solving issues on Earth, such as poverty, hunger, global warming, and traffic congestion.
  • The U.S. must crack down on illegal immigration.
  • Street cameras and street-view maps have led to a total loss of privacy in the United States and elsewhere.

These thesis statements are effective because they offer opinions that can be supported by evidence. If you are writing an argument essay, you can craft your own thesis around the structure of the statements above.

Analytical Essay Thesis Statement Examples

In an analytical essay assignment, you will be expected to break down a topic, process, or object in order to observe and analyze your subject piece by piece. Examples of a thesis statement for an analytical essay include:

  • The criminal justice reform bill passed by the U.S. Senate in late 2018 (" The First Step Act ") aims to reduce prison sentences that disproportionately fall on nonwhite criminal defendants.
  • The rise in populism and nationalism in the U.S. and European democracies has coincided with the decline of moderate and centrist parties that have dominated since WWII.
  • Later-start school days increase student success for a variety of reasons.

Because the role of the thesis statement is to state the central message of your entire paper, it is important to revisit (and maybe rewrite) your thesis statement after the paper is written. In fact, it is quite normal for your message to change as you construct your paper.

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A thesis statement is a declarative sentence that asserts the position a paper will be taking. This statement should be both specific and arguable. Generally, the thesis statement will be placed at the end of the first paragraph of your paper. The remainder of your paper will support this thesis.

After you've landed on a satisfactory topic, your next step will be to solidify the position you would like to take and write a clear and succinct thesis statement which will lay the foundation for the rest of your paper.

For the sake of example, let's say that you've chosen to argue the merits of eating locally grown foods. You want to focus on the positive effects that this will have on one's health, the local economy, and on global ecology. You also want to dispel the myth that eating locally is more expensive, and therefore, the exclusive purview of the upper middle class.

An example of a thesis statement outlining your position might look like this:

The locavore movement that has gained popularity in the United States over the past several years offers a way to increase health, support the local economy, and promote global ecology by making some simple changes to the way that you and your family eat. Although frequently criticized for being far more expensive than eating factory-farmed foods, the truth is that the costs of home gardening and the prices for which you can purchase food at your local farmer's market are often far less expensive alternatives than buying from a chain grocer, not to mention safer and more nutritious.

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How to write a thesis statement + examples

Thesis statement

What is a thesis statement?

Is a thesis statement a question, how do you write a good thesis statement, how do i know if my thesis statement is good, examples of thesis statements, helpful resources on how to write a thesis statement, frequently asked questions about writing a thesis statement, related articles.

A thesis statement is the main argument of your paper or thesis.

The thesis statement is one of the most important elements of any piece of academic writing . It is a brief statement of your paper’s main argument. Essentially, you are stating what you will be writing about.

You can see your thesis statement as an answer to a question. While it also contains the question, it should really give an answer to the question with new information and not just restate or reiterate it.

Your thesis statement is part of your introduction. Learn more about how to write a good thesis introduction in our introduction guide .

A thesis statement is not a question. A statement must be arguable and provable through evidence and analysis. While your thesis might stem from a research question, it should be in the form of a statement.

Tip: A thesis statement is typically 1-2 sentences. For a longer project like a thesis, the statement may be several sentences or a paragraph.

A good thesis statement needs to do the following:

  • Condense the main idea of your thesis into one or two sentences.
  • Answer your project’s main research question.
  • Clearly state your position in relation to the topic .
  • Make an argument that requires support or evidence.

Once you have written down a thesis statement, check if it fulfills the following criteria:

  • Your statement needs to be provable by evidence. As an argument, a thesis statement needs to be debatable.
  • Your statement needs to be precise. Do not give away too much information in the thesis statement and do not load it with unnecessary information.
  • Your statement cannot say that one solution is simply right or simply wrong as a matter of fact. You should draw upon verified facts to persuade the reader of your solution, but you cannot just declare something as right or wrong.

As previously mentioned, your thesis statement should answer a question.

If the question is:

What do you think the City of New York should do to reduce traffic congestion?

A good thesis statement restates the question and answers it:

In this paper, I will argue that the City of New York should focus on providing exclusive lanes for public transport and adaptive traffic signals to reduce traffic congestion by the year 2035.

Here is another example. If the question is:

How can we end poverty?

A good thesis statement should give more than one solution to the problem in question:

In this paper, I will argue that introducing universal basic income can help reduce poverty and positively impact the way we work.

  • The Writing Center of the University of North Carolina has a list of questions to ask to see if your thesis is strong .

A thesis statement is part of the introduction of your paper. It is usually found in the first or second paragraph to let the reader know your research purpose from the beginning.

In general, a thesis statement should have one or two sentences. But the length really depends on the overall length of your project. Take a look at our guide about the length of thesis statements for more insight on this topic.

Here is a list of Thesis Statement Examples that will help you understand better how to write them.

Every good essay should include a thesis statement as part of its introduction, no matter the academic level. Of course, if you are a high school student you are not expected to have the same type of thesis as a PhD student.

Here is a great YouTube tutorial showing How To Write An Essay: Thesis Statements .

example of a scientific thesis statement

example of a scientific thesis statement

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Writing a Paper: Thesis Statements

Basics of thesis statements.

The thesis statement is the brief articulation of your paper's central argument and purpose. You might hear it referred to as simply a "thesis." Every scholarly paper should have a thesis statement, and strong thesis statements are concise, specific, and arguable. Concise means the thesis is short: perhaps one or two sentences for a shorter paper. Specific means the thesis deals with a narrow and focused topic, appropriate to the paper's length. Arguable means that a scholar in your field could disagree (or perhaps already has!).

Strong thesis statements address specific intellectual questions, have clear positions, and use a structure that reflects the overall structure of the paper. Read on to learn more about constructing a strong thesis statement.

Being Specific

This thesis statement has no specific argument:

Needs Improvement: In this essay, I will examine two scholarly articles to find similarities and differences.

This statement is concise, but it is neither specific nor arguable—a reader might wonder, "Which scholarly articles? What is the topic of this paper? What field is the author writing in?" Additionally, the purpose of the paper—to "examine…to find similarities and differences" is not of a scholarly level. Identifying similarities and differences is a good first step, but strong academic argument goes further, analyzing what those similarities and differences might mean or imply.

Better: In this essay, I will argue that Bowler's (2003) autocratic management style, when coupled with Smith's (2007) theory of social cognition, can reduce the expenses associated with employee turnover.

The new revision here is still concise, as well as specific and arguable.  We can see that it is specific because the writer is mentioning (a) concrete ideas and (b) exact authors.  We can also gather the field (business) and the topic (management and employee turnover). The statement is arguable because the student goes beyond merely comparing; he or she draws conclusions from that comparison ("can reduce the expenses associated with employee turnover").

Making a Unique Argument

This thesis draft repeats the language of the writing prompt without making a unique argument:

Needs Improvement: The purpose of this essay is to monitor, assess, and evaluate an educational program for its strengths and weaknesses. Then, I will provide suggestions for improvement.

You can see here that the student has simply stated the paper's assignment, without articulating specifically how he or she will address it. The student can correct this error simply by phrasing the thesis statement as a specific answer to the assignment prompt.

Better: Through a series of student interviews, I found that Kennedy High School's antibullying program was ineffective. In order to address issues of conflict between students, I argue that Kennedy High School should embrace policies outlined by the California Department of Education (2010).

Words like "ineffective" and "argue" show here that the student has clearly thought through the assignment and analyzed the material; he or she is putting forth a specific and debatable position. The concrete information ("student interviews," "antibullying") further prepares the reader for the body of the paper and demonstrates how the student has addressed the assignment prompt without just restating that language.

Creating a Debate

This thesis statement includes only obvious fact or plot summary instead of argument:

Needs Improvement: Leadership is an important quality in nurse educators.

A good strategy to determine if your thesis statement is too broad (and therefore, not arguable) is to ask yourself, "Would a scholar in my field disagree with this point?" Here, we can see easily that no scholar is likely to argue that leadership is an unimportant quality in nurse educators.  The student needs to come up with a more arguable claim, and probably a narrower one; remember that a short paper needs a more focused topic than a dissertation.

Better: Roderick's (2009) theory of participatory leadership  is particularly appropriate to nurse educators working within the emergency medicine field, where students benefit most from collegial and kinesthetic learning.

Here, the student has identified a particular type of leadership ("participatory leadership"), narrowing the topic, and has made an arguable claim (this type of leadership is "appropriate" to a specific type of nurse educator). Conceivably, a scholar in the nursing field might disagree with this approach. The student's paper can now proceed, providing specific pieces of evidence to support the arguable central claim.

Choosing the Right Words

This thesis statement uses large or scholarly-sounding words that have no real substance:

Needs Improvement: Scholars should work to seize metacognitive outcomes by harnessing discipline-based networks to empower collaborative infrastructures.

There are many words in this sentence that may be buzzwords in the student's field or key terms taken from other texts, but together they do not communicate a clear, specific meaning. Sometimes students think scholarly writing means constructing complex sentences using special language, but actually it's usually a stronger choice to write clear, simple sentences. When in doubt, remember that your ideas should be complex, not your sentence structure.

Better: Ecologists should work to educate the U.S. public on conservation methods by making use of local and national green organizations to create a widespread communication plan.

Notice in the revision that the field is now clear (ecology), and the language has been made much more field-specific ("conservation methods," "green organizations"), so the reader is able to see concretely the ideas the student is communicating.

Leaving Room for Discussion

This thesis statement is not capable of development or advancement in the paper:

Needs Improvement: There are always alternatives to illegal drug use.

This sample thesis statement makes a claim, but it is not a claim that will sustain extended discussion. This claim is the type of claim that might be appropriate for the conclusion of a paper, but in the beginning of the paper, the student is left with nowhere to go. What further points can be made? If there are "always alternatives" to the problem the student is identifying, then why bother developing a paper around that claim? Ideally, a thesis statement should be complex enough to explore over the length of the entire paper.

Better: The most effective treatment plan for methamphetamine addiction may be a combination of pharmacological and cognitive therapy, as argued by Baker (2008), Smith (2009), and Xavier (2011).

In the revised thesis, you can see the student make a specific, debatable claim that has the potential to generate several pages' worth of discussion. When drafting a thesis statement, think about the questions your thesis statement will generate: What follow-up inquiries might a reader have? In the first example, there are almost no additional questions implied, but the revised example allows for a good deal more exploration.

Thesis Mad Libs

If you are having trouble getting started, try using the models below to generate a rough model of a thesis statement! These models are intended for drafting purposes only and should not appear in your final work.

  • In this essay, I argue ____, using ______ to assert _____.
  • While scholars have often argued ______, I argue______, because_______.
  • Through an analysis of ______, I argue ______, which is important because_______.

Words to Avoid and to Embrace

When drafting your thesis statement, avoid words like explore, investigate, learn, compile, summarize , and explain to describe the main purpose of your paper. These words imply a paper that summarizes or "reports," rather than synthesizing and analyzing.

Instead of the terms above, try words like argue, critique, question , and interrogate . These more analytical words may help you begin strongly, by articulating a specific, critical, scholarly position.

Read Kayla's blog post for tips on taking a stand in a well-crafted thesis statement.

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example of a scientific thesis statement

How to Write a Strong Thesis Statement: 4 Steps + Examples

example of a scientific thesis statement

What’s Covered:

What is the purpose of a thesis statement, writing a good thesis statement: 4 steps, common pitfalls to avoid, where to get your essay edited for free.

When you set out to write an essay, there has to be some kind of point to it, right? Otherwise, your essay would just be a big jumble of word salad that makes absolutely no sense. An essay needs a central point that ties into everything else. That main point is called a thesis statement, and it’s the core of any essay or research paper.

You may hear about Master degree candidates writing a thesis, and that is an entire paper–not to be confused with the thesis statement, which is typically one sentence that contains your paper’s focus. 

Read on to learn more about thesis statements and how to write them. We’ve also included some solid examples for you to reference.

Typically the last sentence of your introductory paragraph, the thesis statement serves as the roadmap for your essay. When your reader gets to the thesis statement, they should have a clear outline of your main point, as well as the information you’ll be presenting in order to either prove or support your point. 

The thesis statement should not be confused for a topic sentence , which is the first sentence of every paragraph in your essay. If you need help writing topic sentences, numerous resources are available. Topic sentences should go along with your thesis statement, though.

Since the thesis statement is the most important sentence of your entire essay or paper, it’s imperative that you get this part right. Otherwise, your paper will not have a good flow and will seem disjointed. That’s why it’s vital not to rush through developing one. It’s a methodical process with steps that you need to follow in order to create the best thesis statement possible.

Step 1: Decide what kind of paper you’re writing

When you’re assigned an essay, there are several different types you may get. Argumentative essays are designed to get the reader to agree with you on a topic. Informative or expository essays present information to the reader. Analytical essays offer up a point and then expand on it by analyzing relevant information. Thesis statements can look and sound different based on the type of paper you’re writing. For example:

  • Argumentative: The United States needs a viable third political party to decrease bipartisanship, increase options, and help reduce corruption in government.
  • Informative: The Libertarian party has thrown off elections before by gaining enough support in states to get on the ballot and by taking away crucial votes from candidates.
  • Analytical: An analysis of past presidential elections shows that while third party votes may have been the minority, they did affect the outcome of the elections in 2020, 2016, and beyond.

Step 2: Figure out what point you want to make

Once you know what type of paper you’re writing, you then need to figure out the point you want to make with your thesis statement, and subsequently, your paper. In other words, you need to decide to answer a question about something, such as:

  • What impact did reality TV have on American society?
  • How has the musical Hamilton affected perception of American history?
  • Why do I want to major in [chosen major here]?

If you have an argumentative essay, then you will be writing about an opinion. To make it easier, you may want to choose an opinion that you feel passionate about so that you’re writing about something that interests you. For example, if you have an interest in preserving the environment, you may want to choose a topic that relates to that. 

If you’re writing your college essay and they ask why you want to attend that school, you may want to have a main point and back it up with information, something along the lines of:

“Attending Harvard University would benefit me both academically and professionally, as it would give me a strong knowledge base upon which to build my career, develop my network, and hopefully give me an advantage in my chosen field.”

Step 3: Determine what information you’ll use to back up your point

Once you have the point you want to make, you need to figure out how you plan to back it up throughout the rest of your essay. Without this information, it will be hard to either prove or argue the main point of your thesis statement. If you decide to write about the Hamilton example, you may decide to address any falsehoods that the writer put into the musical, such as:

“The musical Hamilton, while accurate in many ways, leaves out key parts of American history, presents a nationalist view of founding fathers, and downplays the racism of the times.”

Once you’ve written your initial working thesis statement, you’ll then need to get information to back that up. For example, the musical completely leaves out Benjamin Franklin, portrays the founding fathers in a nationalist way that is too complimentary, and shows Hamilton as a staunch abolitionist despite the fact that his family likely did own slaves. 

Step 4: Revise and refine your thesis statement before you start writing

Read through your thesis statement several times before you begin to compose your full essay. You need to make sure the statement is ironclad, since it is the foundation of the entire paper. Edit it or have a peer review it for you to make sure everything makes sense and that you feel like you can truly write a paper on the topic. Once you’ve done that, you can then begin writing your paper.

When writing a thesis statement, there are some common pitfalls you should avoid so that your paper can be as solid as possible. Make sure you always edit the thesis statement before you do anything else. You also want to ensure that the thesis statement is clear and concise. Don’t make your reader hunt for your point. Finally, put your thesis statement at the end of the first paragraph and have your introduction flow toward that statement. Your reader will expect to find your statement in its traditional spot.

If you’re having trouble getting started, or need some guidance on your essay, there are tools available that can help you. CollegeVine offers a free peer essay review tool where one of your peers can read through your essay and provide you with valuable feedback. Getting essay feedback from a peer can help you wow your instructor or college admissions officer with an impactful essay that effectively illustrates your point.

example of a scientific thesis statement

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example of a scientific thesis statement

How to write a thesis statement (with examples)

Since 2006, oxbridge essays has been the uk’s leading paid essay-writing and dissertation service.

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What exactly is a thesis statement?

What if I told you that one sentence in your essay or thesis could be the difference between a First and a Fail?

It may sound absurd – perhaps even unfair – but it’s true. I refer, of course, to the thesis statement. A thesis statement is your entire essay if it were condensed into a single sentence. If your essay title is a question, then your thesis statement is the one-sentence answer.

It tends to arrive near the end of the first paragraph of a thesis.

Let’s take a look at an example from a Master of Education degree thesis:

Thesis title What constitutes ‘good writing’ for GCSE students of English?

Thesis statement The examination rubric by which GCSE English writing performance is assessed, influenced by a long history of variable ‘tastes’, may now be said to describe ‘good writing’ as that which is grammatically accurate, sophisticated, and suited to purpose, genre and audience.

(The thesis statement would be located in paragraph 1, after a brief overview of the subject).

Why is a thesis statement important?

As I mentioned, the way your thesis statement is written can be the difference between a First and a Fail. But how?

To answer that, let’s think about what ‘thesis’ means. From the Greek thésis, meaning ‘proposition’, your thesis is your main argument.

It is the position you have to support and defend for the remainder of your essay. Without something clear to defend, the fortress you build will crumble and the army you deploy will run about like headless chickens.

In essence: without a clear thesis statement, you don’t have an essay.

“Establishing a clear thesis at the start of your essay is crucial for both you and your examiner. For your examiner, it’s evidence that you have answered the question. For you, it can function as an essay plan.”

For both of you, it’s a litmus test for the quality of the argument: if you can’t fit your essay’s arguments into a sentence, they are too diffuse; and if you can’t stick to your thesis statement’s focus throughout your essay, you are not focused.

A precisely focused and well-grounded essay is more worthy of a First Class grade than one with a scattergun approach.

example of a scientific thesis statement

What should a thesis statement include?

What your thesis statement includes is determined by three things:

1. The subject and topic of the essay. 2. The purpose of the essay. 3. The length of the essay.

Let’s examine each of those in more detail to see how they can help us refine our thesis statement.

The subject and topic of the essay

Look at this real-life title from an undergraduate Sports Science essay:

What are the key differences between training recommendations for maximising muscular strength and maximising muscular hypertrophy?

The first task is, of course, to determine the subject of the essay.

In this example, that would be ‘training recommendations for maximising muscular strength and training recommendations for maximising muscular hypertrophy’.

Knowing that means that I know I will need to deploy my knowledge about those two similar but distinct areas. It also means that I should be using the specialist terminology relevant to the field, such as load, isotonic and volume.

Next, I need to determine the topic.

Here it would be ‘the key differences’ between training recommendations for those two goals. That phrase ‘key differences’ is likely to be at the heart of my thesis statement, to show that I’m on track.

With that in mind, my thesis statement might look like this:

Whilst both training outcomes require resistance training centred upon isotonic contractions, it is likely that the absolute load requirements may need to be higher for strength purposes, whilst the total training volume may need to be higher for hypertrophy purposes.

It is by no means a complete essay, but it states clearly what the ‘short answer’ to the question is, whilst paving the way for the ‘long answer’ to follow.

But what if the essay isn’t just looking for the facts organised into a specific order? What if the essay is asking for analysis? Or an argument?

The purpose of the essay

Different essay purposes require different thesis statements. Fortunately, there are only three main essay purposes, and they’re pretty easy to recognise:

1. The expository essay: This is an essay type that asks for the key facts on a subject to be laid out, with explanations. The Sports Science question above is an example of this. It asks for the WHAT and HOW of something.

2. The analytical essay: This essay type asks you not only to lay out the facts, but also to analyse and deconstruct them to better understand them. It is typical in subjects such as English Literature and Fine Art. It asks for the WHY of something.

3. The argumentative essay: This type of essay asks you to use the facts available, to analyse them for value, and then to provide a point of view about the subject. It moves more quickly through the WHAT, HOW and WHY of a topic through to: WHY DOES IT MATTER?

All of the above essay types need a thesis statement that includes a proposition (a statement which answers the question or addresses the title).

Beyond that, these three essay types all require different additions.

For the expository essay , you need to add an overview of the details of the conclusion. Let’s look at an example:

Expository essay title: What are the key differences between training recommendations for maximising muscular strength and maximising muscular hypertrophy? (BSc in Sports Science)

Expository thesis statement: Whilst both training outcomes require resistance training centred upon isotonic contractions, it is likely that the absolute load requirements may need to be higher for strength purposes, whilst the total training volume may need to be higher for hypertrophy purposes. (The basic conclusion is that both approaches need isotonic resistance training; the details are teased out in bold.)

For the analytical essay , you need to add an overview of the analysis performed. Here’s an example:

Analytical essay title: Why did England and Wales vote to leave the European Union? (BA in Politics)

Analytical thesis statement: A close consideration of the voter demographics, the populist nature of political messages leading up to the referendum, and the history of Britain’s status in the EU, will demonstrate that Brexit was primarily motivated by the machinations of the Right.

(The basic conclusion is that Brexit was influenced by politicians; the analytical approach is in bold.)

For the argumentative essay , you need to add an overview of your reasoning. Another example:

Argumentative essay title: To what extent do you consider the authorship of Shakespeare’s plays to be in question? (BA in English Literature)

Argumentative thesis statement: Shakespeare’s authorship of his plays is beyond question, given both the entirely unconvincing nature of any counter-theories and the relatively unstable conception of the playwright’s identity as it stands. (The basic conclusion is that Shakespeare did write his plays; the reasoning is in bold.)

As you can see from these examples, the purpose of the essay gives a very clear demand for something beyond a simple answer.

But, there’s more!

The length of the essay

The prescribed length of the essay also defines what you need to do with your thesis statement.

Your thesis statement is a microcosm : a miniature, compressed version of your whole essay.

So, it makes sense that the length of the actual essay is going to impact upon the content of the thesis statement.

If, for example, your essay is expected to be 800 words long and on the subject of Eve in the Bible, then it would be overly ambitious for your thesis statement to say: ‘through comprehensive study of the Bible and extant criticism’. For an 800 essay, more precision will be necessary. It would be better for your thesis statement to say: ‘with due awareness of the complexity of the issue, focusing on feminist readings of Genesis .’

“Matching the scope given in your thesis statement to the depth you provide in your essay is a very effective way to ensure precision.”

Contrastingly, if your essay is expected to be 80,000 words long (a PhD thesis, for example), on the subject of stop-motion animation, it would be rather unambitious to suggest that the essay will ‘provide a visual analysis of Wallace and Gromit: The Wrong Trousers’, only. For a PhD, we would expect more content to be covered, and multiple approaches to analysis to be considered.

Indeed, matching the scope given in your thesis statement to the depth you provide in your essay is a very effective way to ensure precision.

example of a scientific thesis statement

So, to summarise, how do I write a thesis statement?

It’s a simple, three-part process:

1. Identify the question in the title (or make a question from the statement). 2. Answer that question in as few words as possible. 3. Complete the sentence by providing an overview of the foundation behind your answer.

Easy, right? It can be!

That said, there are plenty of traps that essayists can fall into with this part of the essay. Let’s look at some of these pitfalls and how to avoid them.

Pitalls to Avoid

Pitfall #1: amateurish style.

This is common throughout academic essays written by beginners. It’s not just the thesis statement that falls foul of sounding amateurish. There are plenty of ways this happens, which are beyond the scope of this argument, but the following example is a prime example: In this essay, I will explore the various pieces of evidence before concluding.

This is amateurish for a few reasons. Firstly, it doesn’t actually say anything. You could otherwise word it, ‘I will write an essay which answers the question’ – a rather wasted sentence. The next, and more forgivable issue is the use of the first-person. We want to get a sense that an individual wrote this essay, but we never want to hear them mentioned! Make sense? No? Sorry.

This should instead read more like:

This essay considers evidence from X in light of Y which ultimately reveals Z at the heart of the issue.

(It focuses on the specifics, X, Y, and Z, and is devoid of any mention of its author.)

Pitfall #2: empty phrasing

This is similar to amateurish style. However, empty phrasing is not just amateur-sounding; it’s manipulative-sounding.

Using phrases such as “in order to” instead of, simply, “to” – or “due to the fact that” instead of just “as” – look like attempts to fill up the word count with waffle rather than content. The same goes for phrases that can be substituted for one word: ‘it is evident that’ can (and should) become ‘evidently’.

Watch this thesis statement from a GCSE essay on Music go from hideous to tolerable:

Beethoven was unable to hear his work, due to the fact that he was deaf, so it is evident that he musically conceptualised the notes in order to compose. (Wordy!)

Beethoven was unable to hear his work, as he was deaf, so it is evident that he musically conceptualised the notes to compose. (Slightly less wordy.)

Beethoven’s deafness made him unable to hear his work, so evidently he musically conceptualised the notes to compose. (About as concise as such a complex sentence will get…)

Do not mistake wordiness for sophistication. Your ideas should be sophisticated; your writing should be clear.

Pitfall #3: non-standard grammar

For an examiner, the English language is not just a vehicle for your ideas. It should be, but the academic process always involves the assessment of your expression.

So, to satisfy our examiners’ prescriptive tastes, we need to adhere to the basic tenets of Standard English.

Take a look at the following thesis statement example from an A Level Sociology essay: Considering the status of BAME in Internet culture, the demonstrably racist treatment at the hands of the police, and the energy behind the BLM protests, concluding that there is hope for the future.

This sentence has no finite main verb, so it is technically not a sentence. To become a grammatical sentence, we would need to make ‘concluding’ finite: ‘it can be concluded’, or ‘we conclude’.

The writer got lost in this example because the sentence was so long!

Long sentences can also lead to a failure to make subject and verb agree, like in the next thesis statement example from a school Geography essay:

The most populous municipalities of Spain, Madrid, Barcelona, Valencia, Seville, and Zaragoza, does not rank in the top ten most dense populations of the country, with the exception of Barcelona.

Because the subject ‘municipalities’ is separated from the verb ‘does’ by eight words, it is easy to forget that they do not agree. It should, of course, be ‘do, not ‘does’.

Final words

The thesis statement, as I said at the start, can be the difference between a First and a Fail. So, take your time with it.

Write it carefully.

Then redraft and refine it several times, until it’s as good as you can make it.

The payoff is a slick, coherent thesis statement that paves the way to a great essay that really impresses your examiner.

example of a scientific thesis statement

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25 Thesis Statement Examples That Will Make Writing a Breeze

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Understanding what makes a good thesis statement is one of the major keys to writing a great research paper or argumentative essay. The thesis statement is where you make a claim that will guide you through your entire paper. If you find yourself struggling to make sense of your paper or your topic, then it's likely due to a weak thesis statement.

Let's take a minute to first understand what makes a solid thesis statement, and what key components you need to write one of your own.

Perfecting Your Thesis Statement

A thesis statement always goes at the beginning of the paper. It will typically be in the first couple of paragraphs of the paper so that it can introduce the body paragraphs, which are the supporting evidence for your thesis statement.

Your thesis statement should clearly identify an argument. You need to have a statement that is not only easy to understand, but one that is debatable. What that means is that you can't just put any statement of fact and have it be your thesis. For example, everyone knows that puppies are cute . An ineffective thesis statement would be, "Puppies are adorable and everyone knows it." This isn't really something that's a debatable topic.

Something that would be more debatable would be, "A puppy's cuteness is derived from its floppy ears, small body, and playfulness." These are three things that can be debated on. Some people might think that the cutest thing about puppies is the fact that they follow you around or that they're really soft and fuzzy.

All cuteness aside, you want to make sure that your thesis statement is not only debatable, but that it also actually thoroughly answers the research question that was posed. You always want to make sure that your evidence is supporting a claim that you made (and not the other way around). This is why it's crucial to read and research about a topic first and come to a conclusion later. If you try to get your research to fit your thesis statement, then it may not work out as neatly as you think. As you learn more, you discover more (and the outcome may not be what you originally thought).

Additionally, your thesis statement shouldn't be too big or too grand. It'll be hard to cover everything in a thesis statement like, "The federal government should act now on climate change." The topic is just too large to actually say something new and meaningful. Instead, a more effective thesis statement might be, "Local governments can combat climate change by providing citizens with larger recycling bins and offering local classes about composting and conservation." This is easier to work with because it's a smaller idea, but you can also discuss the overall topic that you might be interested in, which is climate change.

So, now that we know what makes a good, solid thesis statement, you can start to write your own. If you find that you're getting stuck or you are the type of person who needs to look at examples before you start something, then check out our list of thesis statement examples below.

Thesis statement examples

A quick note that these thesis statements have not been fully researched. These are merely examples to show you what a thesis statement might look like and how you can implement your own ideas into one that you think of independently. As such, you should not use these thesis statements for your own research paper purposes. They are meant to be used as examples only.

  • Vaccinations Because many children are unable to vaccinate due to illness, we must require that all healthy and able children be vaccinated in order to have herd immunity.
  • Educational Resources for Low-Income Students Schools should provide educational resources for low-income students during the summers so that they don't forget what they've learned throughout the school year.
  • School Uniforms School uniforms may be an upfront cost for families, but they eradicate the visual differences in income between students and provide a more egalitarian atmosphere at school.
  • Populism The rise in populism on the 2016 political stage was in reaction to increasing globalization, the decline of manufacturing jobs, and the Syrian refugee crisis.
  • Public Libraries Libraries are essential resources for communities and should be funded more heavily by local municipalities.
  • Cyber Bullying With more and more teens using smartphones and social media, cyber bullying is on the rise. Cyber bullying puts a lot of stress on many teens, and can cause depression, anxiety, and even suicidal thoughts. Parents should limit the usage of smart phones, monitor their children's online activity, and report any cyber bullying to school officials in order to combat this problem.
  • Medical Marijuana for Veterans Studies have shown that the use of medicinal marijuana has been helpful to veterans who suffer from Post-Traumatic Stress Disorder (PTSD). Medicinal marijuana prescriptions should be legal in all states and provided to these veterans. Additional medical or therapy services should also be researched and implemented in order to help them re-integrate back into civilian life.
  • Work-Life Balance Corporations should provide more work from home opportunities and six-hour workdays so that office workers have a better work-life balance and are more likely to be productive when they are in the office.
  • Teaching Youths about Consensual Sex Although sex education that includes a discussion of consensual sex would likely lead to less sexual assault, parents need to teach their children the meaning of consent from a young age with age appropriate lessons.
  • Whether or Not to Attend University A degree from a university provides invaluable lessons on life and a future career, but not every high school student should be encouraged to attend a university directly after graduation. Some students may benefit from a trade school or a "gap year" where they can think more intensely about what it is they want to do for a career and how they can accomplish this.
  • Studying Abroad Studying abroad is one of the most culturally valuable experiences you can have in college. It is the only way to get completely immersed in another language and learn how other cultures and countries are different from your own.
  • Women's Body Image Magazines have done a lot in the last five years to include a more diverse group of models, but there is still a long way to go to promote a healthy woman's body image collectively as a culture.
  • Cigarette Tax Heavily taxing and increasing the price of cigarettes is essentially a tax on the poorest Americans, and it doesn't deter them from purchasing. Instead, the state and federal governments should target those economically disenfranchised with early education about the dangers of smoking.
  • Veganism A vegan diet, while a healthy and ethical way to consume food, indicates a position of privilege. It also limits you to other cultural food experiences if you travel around the world.
  • University Athletes Should be Compensated University athletes should be compensated for their service to the university, as it is difficult for these students to procure and hold a job with busy academic and athletic schedules. Many student athletes on scholarship also come from low-income neighborhoods and it is a struggle to make ends meet when they are participating in athletics.
  • Women in the Workforce Sheryl Sandberg makes a lot of interesting points in her best-selling book, Lean In , but she only addressed the very privileged working woman and failed to speak to those in lower-skilled, lower-wage jobs.
  • Assisted Suicide Assisted suicide should be legal and doctors should have the ability to make sure their patients have the end-of-life care that they want to receive.
  • Celebrity and Political Activism Although Taylor Swift's lyrics are indicative of a feminist perspective, she should be more politically active and vocal to use her position of power for the betterment of society.
  • The Civil War The insistence from many Southerners that the South seceded from the Union for states' rights versus the fact that they seceded for the purposes of continuing slavery is a harmful myth that still affects race relations today.
  • Blue Collar Workers Coal miners and other blue-collar workers whose jobs are slowly disappearing from the workforce should be re-trained in jobs in the technology sector or in renewable energy. A program to re-train these workers would not only improve local economies where jobs have been displaced, but would also lead to lower unemployment nationally.
  • Diversity in the Workforce Having a diverse group of people in an office setting leads to richer ideas, more cooperation, and more empathy between people with different skin colors or backgrounds.
  • Re-Imagining the Nuclear Family The nuclear family was traditionally defined as one mother, one father, and 2.5 children. This outdated depiction of family life doesn't quite fit with modern society. The definition of normal family life shouldn't be limited to two-parent households.
  • Digital Literacy Skills With more information readily available than ever before, it's crucial that students are prepared to examine the material they're reading and determine whether or not it's a good source or if it has misleading information. Teaching students digital literacy and helping them to understand the difference between opinion or propaganda from legitimate, real information is integral.
  • Beauty Pageants Beauty pageants are presented with the angle that they empower women. However, putting women in a swimsuit on a stage while simultaneously judging them on how well they answer an impossible question in a short period of time is cruel and purely for the amusement of men. Therefore, we should stop televising beauty pageants.
  • Supporting More Women to Run for a Political Position In order to get more women into political positions, more women must run for office. There must be a grassroots effort to educate women on how to run for office, who among them should run, and support for a future candidate for getting started on a political career.

Still stuck? Need some help with your thesis statement?

If you are still uncertain about how to write a thesis statement or what a good thesis statement is, be sure to consult with your teacher or professor to make sure you're on the right track. It's always a good idea to check in and make sure that your thesis statement is making a solid argument and that it can be supported by your research.

After you're done writing, it's important to have someone take a second look at your paper so that you can ensure there are no mistakes or errors. It's difficult to spot your own mistakes, which is why it's always recommended to have someone help you with the revision process, whether that's a teacher, the writing center at school, or a professional editor such as one from ServiceScape .

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What Makes a Thesis Statement Spectacular? — 5 things to know

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Table of Contents

What Is a Thesis Statement?

A thesis statement is a declarative sentence that states the primary idea of an essay or a research paper . In this statement, the authors declare their beliefs or what they intend to argue in their research study. The statement is clear and concise, with only one or two sentences.

Thesis Statement — An Essential in Thesis Writing

A thesis statement distills the research paper idea into one or two sentences. This summary organizes your paper and develops the research argument or opinion. The statement is important because it lets the reader know what the research paper will talk about and how the author is approaching the issue. Moreover, the statement also serves as a map for the paper and helps the authors to track and organize their thoughts more efficiently.

A thesis statement can keep the writer from getting lost in a convoluted and directionless argument. Finally, it will also ensure that the research paper remains relevant and focused on the objective.

Where to Include the Thesis Statement?

The thesis statement is typically placed at the end of the introduction section of your essay or research paper. It usually consists of a single sentence of the writer’s opinion on the topic and provides a specific guide to the readers throughout the paper.

6 Steps to Write an Impactful Thesis Statement

Step 1 – analyze the literature.

Identify the knowledge gaps in the relevant research paper. Analyze the deeper implications of the author’s research argument. Was the research objective mentioned in the thesis statement reversed later in the discussion or conclusion? Does the author contradict themselves? Is there a major knowledge gap in creating a relevant research objective? Has the author understood and validated the fundamental theories correctly? Does the author support an argument without having supporting literature to cite? Answering these or related questions will help authors develop a working thesis and give their thesis an easy direction and structure.

Step 2 – Start with a Question

While developing a working thesis, early in the writing process, you might already have a research question to address. Strong research questions guide the design of studies and define and identify specific objectives. These objectives will assist the author in framing the thesis statement.

Step 3 – Develop the Answer

After initial research, the author could formulate a tentative answer to the research question. At this stage, the answer could be simple enough to guide the research and the writing process. After writing the initial answer, the author could elaborate further on why this is the chosen answer. After reading more about the research topic, the author could write and refine the answers to address the research question.

Step 4 – Write the First Draft of the Thesis Statement

After ideating the working thesis statement, make sure to write it down. It is disheartening to create a great idea for a thesis and then forget it when you lose concentration. The first draft will help you think clearly and logically. It will provide you with an option to align your thesis statement with the defined research objectives.

Step 5 – Anticipate Counter Arguments Against the Statement

After developing a working thesis, you should think about what might be said against it. This list of arguments will help you refute the thesis later. Remember that every argument has a counterargument, and if yours does not have one, what you state is not an argument — it may be a fact or opinion, but not an argument.

Step 6 – Refine the Statement

Anticipating counterarguments will help you refine your statement further. A strong thesis statement should address —

  • Why does your research hold this stand?
  • What will readers learn from the essay?
  • Are the key points of your argumentative or narrative?
  • Does the final thesis statement summarize your overall argument or the entire topic you aim to explain in the research paper?

example of a scientific thesis statement

5 Tips to Create a Compelling Thesis Statement

A thesis statement is a crucial part of any academic paper. Clearly stating the main idea of your research helps you focus on the objectives of your paper. Refer to the following tips while drafting your statement:

1. Keep it Concise

The statement should be short and precise. It should contain no more than a couple of sentences.

2. Make it Specific

The statement should be focused on a specific topic or argument. Covering too many topics will only make your paper weaker.

3. Express an Opinion

The statement should have an opinion on an issue or controversy. This will make your paper arguable and interesting to read.

4. Be Assertive

The statement should be stated assertively and not hesitantly or apologetically. Remember, you are making an argument — you need to sound convincing!

5. Support with Evidence

The thesis should be supported with evidence from your paper. Make sure you include specific examples from your research to reinforce your objectives.

Thesis Statement Examples *

Example 1 – alcohol consumption.

High levels of alcohol consumption have harmful effects on your health, such as weight gain, heart disease, and liver complications.

This thesis statement states specific reasons why alcohol consumption is detrimental. It is not required to mention every single detriment in your thesis.

Example 2 – Benefits of the Internet

The internet serves as a means of expediently connecting people across the globe, fostering new friendships and an exchange of ideas that would not have occurred before its inception.

While the internet offers a host of benefits, this thesis statement is about choosing the ability that fosters new friendships and exchange ideas. Also, the research needs to prove how connecting people across the globe could not have happened before the internet’s inception — which is a focused research statement.

*The following thesis statements are not fully researched and are merely examples shown to understand how to write a thesis statement. Also, you should avoid using these statements for your own research paper purposes.

A gripping thesis statement is developed by understanding it from the reader’s point of view. Be aware of not developing topics that only interest you and have less reader attraction. A harsh yet necessary question to ask oneself is — Why should readers read my paper? Is this paper worth reading? Would I read this paper if I weren’t its author?

A thesis statement hypes your research paper. It makes the readers excited about what specific information is coming their way. This helps them learn new facts and possibly embrace new opinions.

Writing a thesis statement (although two sentences) could be a daunting task. Hope this blog helps you write a compelling one! Do consider using the steps to create your thesis statement and tell us about it in the comment section below.

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25 Thesis Statement Examples

25 Thesis Statement Examples

Chris Drew (PhD)

Dr. Chris Drew is the founder of the Helpful Professor. He holds a PhD in education and has published over 20 articles in scholarly journals. He is the former editor of the Journal of Learning Development in Higher Education. [Image Descriptor: Photo of Chris]

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thesis statement examples and definition, explained below

A thesis statement is needed in an essay or dissertation . There are multiple types of thesis statements – but generally we can divide them into expository and argumentative. An expository statement is a statement of fact (common in expository essays and process essays) while an argumentative statement is a statement of opinion (common in argumentative essays and dissertations). Below are examples of each.

Strong Thesis Statement Examples

school uniforms and dress codes, explained below

1. School Uniforms

“Mandatory school uniforms should be implemented in educational institutions as they promote a sense of equality, reduce distractions, and foster a focused and professional learning environment.”

Best For: Argumentative Essay or Debate

Read More: School Uniforms Pros and Cons

nature vs nurture examples and definition

2. Nature vs Nurture

“This essay will explore how both genetic inheritance and environmental factors equally contribute to shaping human behavior and personality.”

Best For: Compare and Contrast Essay

Read More: Nature vs Nurture Debate

American Dream Examples Definition

3. American Dream

“The American Dream, a symbol of opportunity and success, is increasingly elusive in today’s socio-economic landscape, revealing deeper inequalities in society.”

Best For: Persuasive Essay

Read More: What is the American Dream?

social media pros and cons

4. Social Media

“Social media has revolutionized communication and societal interactions, but it also presents significant challenges related to privacy, mental health, and misinformation.”

Best For: Expository Essay

Read More: The Pros and Cons of Social Media

types of globalization, explained below

5. Globalization

“Globalization has created a world more interconnected than ever before, yet it also amplifies economic disparities and cultural homogenization.”

Read More: Globalization Pros and Cons

urbanization example and definition

6. Urbanization

“Urbanization drives economic growth and social development, but it also poses unique challenges in sustainability and quality of life.”

Read More: Learn about Urbanization

immigration pros and cons, explained below

7. Immigration

“Immigration enriches receiving countries culturally and economically, outweighing any perceived social or economic burdens.”

Read More: Immigration Pros and Cons

cultural identity examples and definition, explained below

8. Cultural Identity

“In a globalized world, maintaining distinct cultural identities is crucial for preserving cultural diversity and fostering global understanding, despite the challenges of assimilation and homogenization.”

Best For: Argumentative Essay

Read More: Learn about Cultural Identity

technology examples and definition explained below

9. Technology

“Medical technologies in care institutions in Toronto has increased subjcetive outcomes for patients with chronic pain.”

Best For: Research Paper

capitalism examples and definition

10. Capitalism vs Socialism

“The debate between capitalism and socialism centers on balancing economic freedom and inequality, each presenting distinct approaches to resource distribution and social welfare.”

cultural heritage examples and definition

11. Cultural Heritage

“The preservation of cultural heritage is essential, not only for cultural identity but also for educating future generations, outweighing the arguments for modernization and commercialization.”

pseudoscience examples and definition, explained below

12. Pseudoscience

“Pseudoscience, characterized by a lack of empirical support, continues to influence public perception and decision-making, often at the expense of scientific credibility.”

Read More: Examples of Pseudoscience

free will examples and definition, explained below

13. Free Will

“The concept of free will is largely an illusion, with human behavior and decisions predominantly determined by biological and environmental factors.”

Read More: Do we have Free Will?

gender roles examples and definition, explained below

14. Gender Roles

“Traditional gender roles are outdated and harmful, restricting individual freedoms and perpetuating gender inequalities in modern society.”

Read More: What are Traditional Gender Roles?

work-life balance examples and definition, explained below

15. Work-Life Ballance

“The trend to online and distance work in the 2020s led to improved subjective feelings of work-life balance but simultaneously increased self-reported loneliness.”

Read More: Work-Life Balance Examples

universal healthcare pros and cons

16. Universal Healthcare

“Universal healthcare is a fundamental human right and the most effective system for ensuring health equity and societal well-being, outweighing concerns about government involvement and costs.”

Read More: The Pros and Cons of Universal Healthcare

raising minimum wage pros and cons

17. Minimum Wage

“The implementation of a fair minimum wage is vital for reducing economic inequality, yet it is often contentious due to its potential impact on businesses and employment rates.”

Read More: The Pros and Cons of Raising the Minimum Wage

homework pros and cons

18. Homework

“The homework provided throughout this semester has enabled me to achieve greater self-reflection, identify gaps in my knowledge, and reinforce those gaps through spaced repetition.”

Best For: Reflective Essay

Read More: Reasons Homework Should be Banned

charter schools vs public schools, explained below

19. Charter Schools

“Charter schools offer alternatives to traditional public education, promising innovation and choice but also raising questions about accountability and educational equity.”

Read More: The Pros and Cons of Charter Schools

internet pros and cons

20. Effects of the Internet

“The Internet has drastically reshaped human communication, access to information, and societal dynamics, generally with a net positive effect on society.”

Read More: The Pros and Cons of the Internet

affirmative action example and definition, explained below

21. Affirmative Action

“Affirmative action is essential for rectifying historical injustices and achieving true meritocracy in education and employment, contrary to claims of reverse discrimination.”

Best For: Essay

Read More: Affirmative Action Pros and Cons

soft skills examples and definition, explained below

22. Soft Skills

“Soft skills, such as communication and empathy, are increasingly recognized as essential for success in the modern workforce, and therefore should be a strong focus at school and university level.”

Read More: Soft Skills Examples

moral panic definition examples

23. Moral Panic

“Moral panic, often fueled by media and cultural anxieties, can lead to exaggerated societal responses that sometimes overlook rational analysis and evidence.”

Read More: Moral Panic Examples

freedom of the press example and definition, explained below

24. Freedom of the Press

“Freedom of the press is critical for democracy and informed citizenship, yet it faces challenges from censorship, media bias, and the proliferation of misinformation.”

Read More: Freedom of the Press Examples

mass media examples definition

25. Mass Media

“Mass media shapes public opinion and cultural norms, but its concentration of ownership and commercial interests raise concerns about bias and the quality of information.”

Best For: Critical Analysis

Read More: Mass Media Examples

Checklist: How to use your Thesis Statement

✅ Position: If your statement is for an argumentative or persuasive essay, or a dissertation, ensure it takes a clear stance on the topic. ✅ Specificity: It addresses a specific aspect of the topic, providing focus for the essay. ✅ Conciseness: Typically, a thesis statement is one to two sentences long. It should be concise, clear, and easily identifiable. ✅ Direction: The thesis statement guides the direction of the essay, providing a roadmap for the argument, narrative, or explanation. ✅ Evidence-based: While the thesis statement itself doesn’t include evidence, it sets up an argument that can be supported with evidence in the body of the essay. ✅ Placement: Generally, the thesis statement is placed at the end of the introduction of an essay.

Try These AI Prompts – Thesis Statement Generator!

One way to brainstorm thesis statements is to get AI to brainstorm some for you! Try this AI prompt:

💡 AI PROMPT FOR EXPOSITORY THESIS STATEMENT I am writing an essay on [TOPIC] and these are the instructions my teacher gave me: [INSTUCTIONS]. I want you to create an expository thesis statement that doesn’t argue a position, but demonstrates depth of knowledge about the topic.

💡 AI PROMPT FOR ARGUMENTATIVE THESIS STATEMENT I am writing an essay on [TOPIC] and these are the instructions my teacher gave me: [INSTRUCTIONS]. I want you to create an argumentative thesis statement that clearly takes a position on this issue.

💡 AI PROMPT FOR COMPARE AND CONTRAST THESIS STATEMENT I am writing a compare and contrast essay that compares [Concept 1] and [Concept2]. Give me 5 potential single-sentence thesis statements that remain objective.

Chris

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  • Chris Drew (PhD) https://helpfulprofessor.com/author/chris-drew-phd/ All 6 Levels of Understanding (on Bloom’s Taxonomy)

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Examples

Good Hypothesis Statement

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example of a scientific thesis statement

Every great scientific journey begins with a well-framed hypothesis. This predictive statement serves as the backbone of a study, guiding research thesis statement with precision and purpose. Whether you’re a budding researcher or a seasoned scientist, crafting a compelling hypothesis is paramount. This guide offers a curated selection of exemplary hypothesis statements, invaluable writing insights, and best practices to ensure your research sets sail on the right course. Dive in to fortify your foundational understanding.

What is a good hypothesis statement?

A good hypothesis statement is a clear, concise, testable, and falsifiable proposition that predicts a particular outcome or relationship between variables based on prior knowledge, observation, or reasoning. It serves as the foundation for the research, guiding the direction and focus of the study.

What is an example of a strong hypothesis?

Example: “Increased exposure to sunlight (independent variable) will lead to an elevation in Vitamin D levels (dependent variable) in adults.”

This simple hypothesis is strong because it’s specific, suggesting a clear relationship between the two variables. It’s also testable, as one can measure Vitamin D levels in adults with varying exposure to sunlight, and it’s falsifiable, as findings might reveal no significant change in Vitamin D levels despite changes in sunlight exposure.

100 Good Hypothesis Statement Examples

Good Hypothesis Statement

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Crafting an impeccable thesis statement is the bedrock of any research. It’s a concise Thesis statement summary of your main point or claim. Here, we present a variety of thesis statement examples across disciplines to inspire and guide your own writing endeavors.

  • Climate Change: Human activities, primarily the burning of fossil fuels and deforestation, are the main drivers behind the alarming acceleration of global warming in the past century.
  • Health and Diet: Regular consumption of fast food, due to its high salt and saturated fat content, is a significant contributor to heart diseases among adults.
  • Social Media: Excessive use of social media platforms has led to increased rates of anxiety and depression among teenagers.
  • Economics: The 2008 financial crisis was precipitated primarily by deregulation in the financial industry and rampant speculation in the housing market.
  • Literature: Shakespeare’s “Macbeth” delves into the psychological repercussions of unchecked ambition, demonstrating its corrosive impact on one’s morality.
  • Education: Incorporating hands-on learning in the curriculum enhances student engagement and promotes better understanding of academic concepts.
  • Technology: The proliferation of smartphones has fundamentally transformed social interactions, leading to a decline in face-to-face communication skills.
  • History: The fall of the Roman Empire was a culmination of external military pressure, internal political corruption, economic decline, and social unrest.
  • Art: Renaissance art glorified human form and intellect, signifying a departure from the religious-centric art of the medieval period.
  • Science: Quantum mechanics challenges traditional Newtonian physics principles, introducing the concept of superposition and quantum entanglement.
  • Migration: The 20th-century Great Migration of African Americans from the rural South to the urban North was driven by the quest for better economic opportunities and escape from institutionalized racism.
  • Culture: The global spread of K-pop is indicative of the universal appeal of musical elements coupled with strategic marketing.
  • Psychology: Childhood traumas have long-lasting implications on adult mental health, often manifesting as anxiety, depression, or PTSD.
  • Gender Studies: Glass ceiling effects persist in contemporary corporate structures, hindering women from attaining top leadership positions.
  • Biology: Evolutionary processes, driven by natural selection, account for the diverse species observed in the natural world.
  • Philosophy: Sartre’s existentialism posits that humans are condemned to be free, bearing the weight of shaping their essence through choices.
  • Law: Mandatory minimum sentencing laws have not deterred drug offenses but have exacerbated the overpopulation issue in prisons.
  • Religion: The Protestant Reformation in the 16th century was a reaction against clerical abuses and the question of salvation in the Catholic Church.
  • Politics: The rise of populist movements in the 21st century can be attributed to increasing economic disparities and a sense of alienation from traditional political systems.
  • Environment: The decline in bee populations is intricately tied to the extensive use of pesticides, posing significant threats to global agriculture.
  • Film Studies: The “Star Wars” franchise revolutionized cinematic storytelling, introducing pioneering visual effects and a uniquely immersive universe.
  • Medicine: The overprescription of antibiotics has led to the emergence of superbugs resistant to conventional treatments.
  • Music: The Beatles’ influence in the 60s was instrumental in shifting the paradigms of songwriting and music production.
  • Anthropology: The Indus Valley Civilization’s urban planning and architecture demonstrate advanced societal structures and knowledge bases.
  • Sociology: The gig economy, spurred by technological advances, has both expanded opportunities for freelancers and intensified job insecurity.
  • Astronomy: The existence of exoplanets in the Goldilocks zone suggests potential for life beyond our solar system.
  • Architecture: Brutalist architecture, characterized by raw concrete and geometric designs, is a reflection of the post-war era’s emphasis on functionality over aesthetics.
  • Criminal Justice: Racial profiling in policing perpetuates systemic racism, undermining trust in law enforcement agencies.
  • Physics: Einstein’s theory of relativity fundamentally altered our understanding of time, space, and the universe’s fabric.
  • Feminism: The #MeToo movement marked a significant turning point in highlighting and combating workplace sexual harassment.
  • Geography: Urbanization trends in the 21st century have led to the growth of mega-cities, with associated challenges in sustainability and infrastructure.
  • Ecology: The loss of biodiversity in rainforests due to deforestation has dire implications for global climate regulation and ecosystem balance.
  • Journalism: The rise of digital journalism has democratized information dissemination but has also amplified the spread of misinformation.
  • Linguistics: The Sapir-Whorf hypothesis suggests that the structure of a language shapes its speakers’ worldview and cognition.
  • Sports: The commercialization of sports, driven by media rights and sponsorships, has both expanded its global reach and diluted its traditional ethos.
  • Theatre: Brecht’s concept of “epic theatre” sought to provoke critical thinking in audiences, promoting a detachment from emotional immersion.
  • Chemistry: The discovery of the DNA double helix by Watson and Crick unveiled the molecular basis of genetics and heredity.
  • Ethics: Utilitarianism, which emphasizes the greatest good for the greatest number, often conflicts with individual rights and autonomy.
  • Marketing: Consumer purchasing behaviors are increasingly influenced by social media influencers, marking a shift from traditional advertising methods.
  • Fashion: The fashion industry’s fast fashion model contributes significantly to environmental degradation, emphasizing the need for sustainable practices.
  • Marine Biology: Coral bleaching, exacerbated by climate change, threatens the health of marine ecosystems and the livelihood of coastal communities.
  • Digital Humanities: The digitization of historical archives has enhanced accessibility but raises concerns about data integrity and preservation.
  • Agriculture: Genetically modified organisms (GMOs) have improved crop yields but spark debates over health implications and biodiversity.
  • Military Strategy: The doctrine of Mutually Assured Destruction during the Cold War deterred direct nuclear confrontation between superpowers.
  • Urban Planning: Green spaces within urban areas not only enhance aesthetics but also significantly impact residents’ mental and physical well-being.
  • Public Health: Vaccination campaigns have been instrumental in eradicating diseases like smallpox, underscoring the importance of global health cooperation.
  • Neuroscience: Neuroplasticity challenges the belief that the adult brain is static, highlighting its adaptability and capacity for change post-injury.
  • Political Science: Globalization, while fostering economic integration, has also exacerbated nationalist sentiments and identity politics.
  • Psychiatry: Cognitive-behavioral therapy has emerged as an effective treatment for a range of mental disorders, emphasizing the interplay between thought and behavior.
  • Pedagogy: Incorporating multiple intelligences in teaching strategies caters to diverse learning styles, promoting holistic education.
  • Robotics: The integration of artificial intelligence in robotics has opened the door to more autonomous and adaptive machines, challenging traditional job roles.
  • Literature: Shakespeare’s tragic heroes, like Hamlet and Othello, exemplify the struggle between personal desires and moral responsibilities.
  • Economics: The gig economy, while offering flexibility to workers, often compromises long-term job security and benefits.
  • Space Exploration: The Mars colonization idea, championed by private space companies, brings forth ethical, technological, and financial challenges.
  • Medieval History: The Magna Carta, signed in 1215, laid the foundational principles for constitutional monarchies and the rule of law.
  • Musicology: The transition from classical to romantic era in music signified an emphasis on emotion, individualism, and the sublime.
  • Anthropology: The study of Neanderthal culture challenges long-held assumptions about their cognitive capabilities and societal structures.
  • Social Media: The proliferation of social media has revolutionized global communication but also poses risks related to privacy and mental health.
  • Genetics: The CRISPR technology holds promise for genetic editing but raises ethical dilemmas around altering the human genome.
  • Migration Studies: The Syrian refugee crisis illuminated the global community’s challenges in addressing mass migrations due to conflict.
  • Climate Science: The anthropogenic factors driving global warming necessitate an immediate shift towards sustainable energy sources.
  • Art History: The Renaissance marked a rebirth in art and culture, characterized by a return to classical ideals and humanism.
  • Endocrinology: The role of insulin in regulating blood sugar revolutionized the understanding and treatment of diabetes.
  • Cinematography: The shift from film to digital cinematography has altered filmmaking aesthetics and production processes.
  • Paleontology: The discovery of feathered dinosaur fossils bridged the evolutionary gap between reptiles and birds.
  • Philosophy: Existentialism, rooted in the works of Sartre and Camus, delves into human freedom, responsibility, and the search for meaning.
  • Data Science: The advent of big data analytics allows businesses to personalize customer experiences but grapples with data privacy issues.
  • Forensic Science: DNA fingerprinting has revolutionized criminal investigations, enabling precise identification of suspects.
  • Sociology: The concept of the “melting pot” in American society has evolved into the idea of a “salad bowl,” emphasizing multicultural coexistence.
  • Dermatology: The understanding of the skin’s microbiome is reshaping treatments for dermatological conditions and overall skin health.
  • Archeology: The deciphering of the Rosetta Stone paved the way for understanding ancient Egyptian civilization through hieroglyphics.
  • Geology: The theory of plate tectonics provided a comprehensive explanation for earthquakes, volcanic activities, and continental drift.
  • Astrophysics: The detection of gravitational waves confirmed Einstein’s prediction and opened a new observational window into the cosmos.
  • Nutrition: The Mediterranean diet, rich in plant-based foods and healthy fats, has been linked to longevity and reduced risk of chronic diseases.
  • Mycology: The study of mycorrhizal fungi demonstrates their essential role in plant nutrient uptake and ecosystem sustainability.
  • Psychology: The study of neuroplasticity reveals that the human brain remains adaptable and can recover even after traumatic injuries, challenging previous beliefs about its rigidity.
  • Oceanography: The deep-sea exploration has unveiled unique bioluminescent organisms, underscoring the ocean’s vast undiscovered biodiversity.
  • Architecture: The Brutalist architectural movement, marked by raw concrete structures, challenges traditional notions of aesthetics while emphasizing functionality.
  • Environmental Science: The introduction of the circular economy aims to reduce waste, highlighting the need for sustainable production and consumption patterns.
  • Linguistics: The extinction rate of indigenous languages has accelerated, emphasizing the urgent need for preservation initiatives.
  • Neuroscience: The discovery of mirror neurons sheds light on human empathy and our ability to understand others’ emotions and intentions.
  • Cultural Studies: The globalization era has witnessed a blending of cultures, leading to hybrid cultural phenomena and redefining identities.
  • Astronomy: The Kepler mission’s exoplanet discoveries have rekindled the age-old debate on the possibility of life beyond Earth.
  • Zoology: The study of animal migration patterns is crucial in understanding the impacts of climate change on various species.
  • Political Science: The rise of populist movements worldwide challenges traditional political paradigms and reflects widespread disillusionment with the establishment.
  • Urban Studies: The concept of smart cities, integrating technology into urban planning, promises more sustainable and efficient urban centers.
  • Agriculture: The promotion of permaculture practices can revolutionize modern farming by enhancing soil health and biodiversity.
  • Biotechnology: The development of lab-grown meat offers potential solutions to the environmental and ethical concerns associated with traditional livestock farming.
  • Quantum Physics: The double-slit experiment underscores the puzzling nature of quantum mechanics, challenging our understanding of reality.
  • Digital Humanities: The digitization of historical manuscripts and artifacts democratizes access to knowledge and preserves cultural heritage.
  • Ecology: The reintroduction of apex predators in ecosystems, like wolves in Yellowstone, demonstrates the intricate balance of food webs.
  • Sport Science: The analysis of athletes’ biomechanics offers insights into optimal performance techniques and injury prevention.
  • Meteorology: The study of atmospheric aerosols is vital in understanding their role in climate change and weather patterns.
  • Folklore: The evolution of folk tales across cultures underscores the universality of human emotions and shared narratives.
  • Nano-technology: The synthesis of graphene has revolutionized potential applications in electronics, energy storage, and even medical devices.
  • Paleontology: The discovery of feathered dinosaur fossils in China challenges traditional understanding of avian evolution, hinting at a closer relationship between birds and some dinosaur species.
  • Genetics: The mapping of the human genome has opened doors for personalized medicine, emphasizing the uniqueness of each individual’s genetic code.
  • Ethnomusicology: The study of indigenous tribal music reveals deep-rooted cultural expressions and the universal human connection to rhythm and melody.
  • Finance: The rise of decentralized finance (DeFi) platforms challenges the traditional banking system, emphasizing the potential of blockchain in revolutionizing finance.
  • Anthropology: The study of ancient human migration patterns through DNA analysis has reshaped our understanding of early human civilizations and interactions.

Good Hypothesis Statement Examples for Research

A well-structured hypothesis for research statement  sets a clear path for investigation. It should be concise, specific, and testable based on available resources.

  • Sociology: Single-parent households will experience higher stress levels than two-parent households.
  • Environmental Science: Urban areas with more green spaces will have lower levels of air pollution.
  • Education: Use of interactive e-learning tools will improve students’ understanding of complex concepts.
  • Economics: Countries with higher literacy rates will showcase better economic growth.
  • Political Science: Electoral participation will increase with more youth-focused political campaigns.
  • Medicine: Regular aerobic exercise will reduce the risk of cardiovascular diseases.
  • Psychology: Social media usage correlates positively with feelings of loneliness in young adults.
  • Linguistics: Children exposed to multilingual environments will have superior cognitive flexibility.
  • Anthropology: Indigenous tribes with minimal contact with modern civilization will have unique social structures.
  • Astrophysics: Star systems with exoplanets in the habitable zone are more likely to contain signs of life.

Good Hypothesis Statement Examples for Science Fair

Crafting a solid hypothesis can make a science fair project stand out. It should be based on observable phenomena and be measurable.

  • Botany: Plants watered with diluted coffee will grow faster than those watered with plain water.
  • Chemistry: Adding salt will increase the boiling point of water.
  • Physics: The elasticity of a rubber band will decrease as it is heated.
  • Biology: Yeast fermentation will produce more CO2 in sugar solutions than in plain water.
  • Earth Science: Crystals will grow faster in warmer solutions than in cooler ones.
  • Ecology: Pond water will contain more microbial life than tap water.
  • Astronomy: Urban areas will exhibit more light pollution, affecting star visibility.
  • Environmental Science: Natural cleaners are as effective as chemical-based cleaners.
  • Zoology: Ants prefer sugary solutions over salty ones.
  • Microbiology: Hand sanitizers with a higher percentage of alcohol will kill more bacteria.

Good Hypothesis Statement Examples for Psychology

Hypotheses in psychology delve into human behavior, emotions, and cognition, aiming to predict outcomes based on conditions or stimuli.

  • Cognitive: People who multitask are more prone to distractions.
  • Developmental: Early exposure to musical instruments enhances spatial reasoning.
  • Social: People with higher empathy levels are better at reading facial expressions.
  • Clinical: Cognitive-behavioral therapy can effectively reduce symptoms of anxiety.
  • Neuropsychology: Sleep deprivation will impair short-term memory.
  • Evolutionary: Altruistic behaviors have evolved because they benefit the species.
  • Health: Chronic stress can lead to lower immune responses.
  • Forensic: Eye-witness testimonies can be influenced by leading questions.
  • Sports: Athletes perform better under moderate levels of arousal.
  • Educational: Incorporating visuals in teaching will improve retention rates in students.

Good Hypothesis Statement Examples in Biology

Biology hypothesis aim to predict the relationships between living organisms and their interactions with the environment.

  • Genetics: Genetically modified crops will show higher resistance to pests.
  • Ecology: Forest areas with diverse flora will support a wider range of fauna.
  • Physiology: Mammals in colder regions will have thicker fur.
  • Cell Biology: Cells exposed to toxins will show irregular mitosis.
  • Marine Biology: Coral bleaching events correlate with rising ocean temperatures.
  • Evolution: Birds with longer beaks are better adapted to access deep-seated food sources.
  • Botany: Plants grown in acidic soil will show stunted growth.
  • Zoology: Predatory animals in isolated islands will show gigantism.
  • Microbiology: Bacteria exposed to antibiotics will develop resistance over generations.
  • Neurobiology: Neurons exposed to neurotoxins will show reduced firing rates.

Good Hypothesis Statement Examples in Product Management

Hypotheses in product management help in predicting user behavior and guiding product enhancements.

  • UX: Incorporating a chatbot will reduce the need for customer service intervention.
  • Design: A minimalist design will improve user engagement and reduce bounce rates.
  • Feature Set: Introducing a dark mode will increase user retention in a mobile app.
  • Functionality: A more intuitive search feature will increase product sales on an e-commerce platform.
  • Accessibility: Implementing voice commands will enhance usability for visually impaired users.
  • Security: Two-factor authentication will reduce the likelihood of unauthorized account access.
  • Integration: Synchronizing with popular social media platforms will increase user registrations.
  • Performance: Improving load times will enhance user satisfaction scores.
  • Feedback: Incorporating user feedback mechanisms will lead to more relevant feature releases.
  • Compatibility: Ensuring multi-device compatibility will expand the user base.

Good Hypothesis Statement Examples for Digital Marketing

n digital marketing, a hypothesis can guide strategies by predicting how certain changes might influence online behavior.

  • Content: Blog posts with more visuals will have higher user engagement.
  • SEO: Mobile-optimized websites will rank higher in search engine results.
  • Social Media: Posts published during peak user hours will receive more engagement.
  • Email Marketing: Personalized email subject lines will have a higher open rate.
  • PPC: Advertisements with emotional appeal will have a higher click-through rate.
  • Affiliate Marketing: Products with higher user reviews will result in more affiliate sales.
  • Influencer Marketing: Collaborations with micro-influencers will yield more organic engagement.
  • Video Marketing: Videos with captions will have a longer view duration.
  • Retargeting: Ads targeting cart abandoners will result in higher conversion rates.
  • Analytics: Implementing heatmap tools will provide clearer insights into user behavior.

Good Testable Hypothesis Statement Examples

For a t estable hypothesis , it must present a potential scenario that can be proven right or wrong through experimentation or observational studies.

  • Physics: Changing the angle of a ramp will alter the speed of a rolling object.
  • Botany: Increasing the amount of sunlight exposure will affect the rate of photosynthesis in plants.
  • Psychology: Children who play memory-based games will perform better in short-term memory tests.
  • Chemistry: The rate of reaction will increase with a rise in temperature up to a certain point.
  • Astronomy: The luminosity of a star is directly related to its mass.
  • Meteorology: High humidity levels will increase the perception of temperature in humans.
  • Geology: The age of a rock layer is inversely proportional to its depth in undisturbed strata.
  • Physiology: The amount of REM sleep is related to memory consolidation in adults.
  • Microbiology: Bacteria in unsanitized water will multiply faster at room temperature than in a cold environment.
  • Nutrition: Consumption of Vitamin C will reduce the duration and severity of common cold symptoms.

Good Null Hypothesis Statement Examples

A null hypothesis assumes no relationship or effect between variables and serves as a foundation to be tested against an alternative hypothesis.

  • Medicine: There is no difference in recovery rates between patients taking Drug A and those taking a placebo.
  • Economics: The introduction of a new fiscal policy will have no effect on employment rates.
  • Biology: There is no significant difference in growth rates between plants in shaded areas and those in sunlight.
  • Sociology: Attending team-building workshops has no impact on employee productivity.
  • Environmental Science: The presence of a new factory has no influence on local air quality measurements.
  • Linguistics: Exposure to abooks has no impact on a child’s reading capability.
  • Musicology: Learning a musical instrument has no influence on mathematical ability.
  • Education: Using digital textbooks versus traditional textbooks has no effect on student comprehension.
  • Psychology: Meditation practices have no effect on stress levels in college students.
  • Sports Science: Consuming energy drinks has no effect on short-term athletic performance.

Effective Hypothesis Statement Examples

An effective hypothesis not only offers a testable proposition but also clarifies the scope and direction of the research, making the study’s intent transparent.

  • Environmental Science: The proximity to urban centers impacts the biodiversity of freshwater streams.
  • Neuroscience: Exposure to blue light before bedtime affects the quality of sleep in adults.
  • Anthropology: Societies with matrilineal structures have different conflict resolution strategies compared to patrilineal ones.
  • Pharmacology: Patients administered Drug B will show faster recovery rates from flu symptoms than those not administered any drug.
  • Zoology: Predators introduced to an isolated ecosystem will alter the behavior patterns of local prey species.
  • Archeology: Civilizations with access to river routes had more expansive trade networks.
  • Literary Studies: Novels from post-war periods reflect societal trauma more than novels from peaceful times.
  • Physics: The density of a material will affect its rate of thermal conduction.
  • Marine Biology: Coral species in deeper waters are less susceptible to bleaching events.
  • Political Science: Democracies with proportional representation voting systems have more diverse legislatures.

Can a hypothesis be a question?

Hypotheses and questions both originate from scientific curiosity. However, they serve distinct roles in research. A research question and hypothesis pinpoints what the researcher is trying to discover or understand. In contrast, a hypothesis is a formulated answer to that question based on prior knowledge, observations, or educated assumptions. It’s an informed prediction that is made to be tested. For example, upon asking “Does music affect concentration?”, a researcher might hypothesize, “Listening to classical music will improve concentration levels during tasks.” It’s essential to note that the question initiates the inquiry, while the hypothesis provides direction to the research.

What are the Characteristics of Good Hypothesis?

A strong hypothesis is not merely a guess. It’s constructed with thought, precision, and a foundation in existing knowledge:

  • Empirical Foundation: This means the hypothesis can be tested and proven or disproven using systematic observations or experiments.
  • Definitiveness: A clear, direct statement is more actionable. Avoid general or ambiguous statements.
  • Alignment with Existing Knowledge: It’s essential that your hypothesis doesn’t clash with well-established scientific theories unless there’s a valid reason to challenge them.
  • Feasibility: The hypothesis should be practical and testable using available resources.

Good Hypothesis vs Bad Hypothesis Examples

Good Hypothesis: “Eating dark chocolate in moderate amounts can improve mood in adults.” Why it’s good: The hypothesis provides specificity about the type of chocolate, quantity, the target group, and the outcome.

Bad Hypothesis: “Chocolate might change feelings.” Why it’s bad: This hypothesis is overly broad, lacking specifics on the type of chocolate, the demographic, or the nature of the change in feelings.

What is the Criteria of the Good Hypothesis?

Beyond being testable, a viable hypothesis should be:

  • Relevant: Directly tackles the research query.
  • Objectivity: Steer clear of personal biases or beliefs. Stick to what can be tested and observed.
  • Generalizability: The findings from the hypothesis should ideally apply to scenarios beyond the immediate research context, amplifying its significance.

What are the 3 things a good hypothesis should have?

For a hypothesis to be effective:

  • Scope: Set boundaries. Decide what is to be studied and under what conditions.
  • Directionality: Your hypothesis should indicate whether one variable will increase or decrease in the presence of another.
  • Clarity in Outcome: Predict a clear outcome based on the relationship between the variables.

How do you write a good hypothesis statement? – Step by Step Guide

Creating a hypothesis involves more than just making an educated guess:

  • Frame the Inquiry: What is your central research question? What are you hoping to uncover?
  • Literature Dive: Scour existing literature on the topic. This can be academic papers, books, or trusted online sources.
  • Spot the Variables: What’s changing in your experiment? What are you observing?
  • Draft It: Convert your insights into a concise, testable hypothesis.
  • Avoid Absolutes: Science rarely deals in certainties. Your hypothesis should reflect the possibility of being disproven.
  • Iterate: As you gather more data or insights, refine your hypothesis to better fit your findings.

Tips for Writing a Good Hypothesis Statement

Crafting a hypothesis is both an art and science:

  • Prioritize Simplicity: Start simple, ensuring your hypothesis is straightforward and easy to understand.
  • Be Open to Change: Research is about discovery, and as you uncover more, your initial hypothesis might need tweaking.
  • Avoid Assumptions: Your hypothesis should be grounded in fact, not personal beliefs.
  • Seek Peer Reviews: Share your hypothesis with colleagues or mentors. They might offer valuable feedback or insights you hadn’t considered.

In essence, a hypothesis is a guiding star in the vast sky of research. It provides direction, clarity, and purpose to your investigations, ensuring your efforts are targeted and meaningful.

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  • How to Write a Strong Hypothesis | Steps & Examples

How to Write a Strong Hypothesis | Steps & Examples

Published on May 6, 2022 by Shona McCombes . Revised on November 20, 2023.

A hypothesis is a statement that can be tested by scientific research. If you want to test a relationship between two or more variables, you need to write hypotheses before you start your experiment or data collection .

Example: Hypothesis

Daily apple consumption leads to fewer doctor’s visits.

Table of contents

What is a hypothesis, developing a hypothesis (with example), hypothesis examples, other interesting articles, frequently asked questions about writing hypotheses.

A hypothesis states your predictions about what your research will find. It is a tentative answer to your research question that has not yet been tested. For some research projects, you might have to write several hypotheses that address different aspects of your research question.

A hypothesis is not just a guess – it should be based on existing theories and knowledge. It also has to be testable, which means you can support or refute it through scientific research methods (such as experiments, observations and statistical analysis of data).

Variables in hypotheses

Hypotheses propose a relationship between two or more types of variables .

  • An independent variable is something the researcher changes or controls.
  • A dependent variable is something the researcher observes and measures.

If there are any control variables , extraneous variables , or confounding variables , be sure to jot those down as you go to minimize the chances that research bias  will affect your results.

In this example, the independent variable is exposure to the sun – the assumed cause . The dependent variable is the level of happiness – the assumed effect .

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Step 1. Ask a question

Writing a hypothesis begins with a research question that you want to answer. The question should be focused, specific, and researchable within the constraints of your project.

Step 2. Do some preliminary research

Your initial answer to the question should be based on what is already known about the topic. Look for theories and previous studies to help you form educated assumptions about what your research will find.

At this stage, you might construct a conceptual framework to ensure that you’re embarking on a relevant topic . This can also help you identify which variables you will study and what you think the relationships are between them. Sometimes, you’ll have to operationalize more complex constructs.

Step 3. Formulate your hypothesis

Now you should have some idea of what you expect to find. Write your initial answer to the question in a clear, concise sentence.

4. Refine your hypothesis

You need to make sure your hypothesis is specific and testable. There are various ways of phrasing a hypothesis, but all the terms you use should have clear definitions, and the hypothesis should contain:

  • The relevant variables
  • The specific group being studied
  • The predicted outcome of the experiment or analysis

5. Phrase your hypothesis in three ways

To identify the variables, you can write a simple prediction in  if…then form. The first part of the sentence states the independent variable and the second part states the dependent variable.

In academic research, hypotheses are more commonly phrased in terms of correlations or effects, where you directly state the predicted relationship between variables.

If you are comparing two groups, the hypothesis can state what difference you expect to find between them.

6. Write a null hypothesis

If your research involves statistical hypothesis testing , you will also have to write a null hypothesis . The null hypothesis is the default position that there is no association between the variables. The null hypothesis is written as H 0 , while the alternative hypothesis is H 1 or H a .

  • H 0 : The number of lectures attended by first-year students has no effect on their final exam scores.
  • H 1 : The number of lectures attended by first-year students has a positive effect on their final exam scores.
Research question Hypothesis Null hypothesis
What are the health benefits of eating an apple a day? Increasing apple consumption in over-60s will result in decreasing frequency of doctor’s visits. Increasing apple consumption in over-60s will have no effect on frequency of doctor’s visits.
Which airlines have the most delays? Low-cost airlines are more likely to have delays than premium airlines. Low-cost and premium airlines are equally likely to have delays.
Can flexible work arrangements improve job satisfaction? Employees who have flexible working hours will report greater job satisfaction than employees who work fixed hours. There is no relationship between working hour flexibility and job satisfaction.
How effective is high school sex education at reducing teen pregnancies? Teenagers who received sex education lessons throughout high school will have lower rates of unplanned pregnancy teenagers who did not receive any sex education. High school sex education has no effect on teen pregnancy rates.
What effect does daily use of social media have on the attention span of under-16s? There is a negative between time spent on social media and attention span in under-16s. There is no relationship between social media use and attention span in under-16s.

If you want to know more about the research process , methodology , research bias , or statistics , make sure to check out some of our other articles with explanations and examples.

  • Sampling methods
  • Simple random sampling
  • Stratified sampling
  • Cluster sampling
  • Likert scales
  • Reproducibility

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  • Null hypothesis
  • Statistical power
  • Probability distribution
  • Effect size
  • Poisson distribution

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  • Cognitive bias
  • Implicit bias
  • Hawthorne effect
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example of a scientific thesis statement

A hypothesis is not just a guess — it should be based on existing theories and knowledge. It also has to be testable, which means you can support or refute it through scientific research methods (such as experiments, observations and statistical analysis of data).

Null and alternative hypotheses are used in statistical hypothesis testing . The null hypothesis of a test always predicts no effect or no relationship between variables, while the alternative hypothesis states your research prediction of an effect or relationship.

Hypothesis testing is a formal procedure for investigating our ideas about the world using statistics. It is used by scientists to test specific predictions, called hypotheses , by calculating how likely it is that a pattern or relationship between variables could have arisen by chance.

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Constraining Explosion Physics and Progenitors of Transients via Statistical Inferencing of All Sky Survey Data Streams

Advancements in astronomical imaging all-sky surveys are revolutionising the field of time domain astronomy. However, the immense volume of alert data presents a critical bottleneck in maximizing scientific returns from these surveys. Effectively analyzing alert streams to discover transients in unexplored physical parameter spaces is crucial for enhancing scientific output. Building robust infrastructure to identify, prioritize, and execute efficient follow-up strategies on alert streams from all-sky surveys becomes critical. My thesis confronts this challenge through a multidisciplinary approach, by integrating statistical methods, machine learning algorithms, and hydrodynamical simulations to constrain transient explosion properties and motivate effective follow-up initiatives.

I analyze a sample of 45 Type II supernovae from the Zwicky Transient Facility (ZTF) public survey using a grid of hydrodynamical models in order to assess whether theoretically driven forecasts can intelligently guide follow-up observations supporting all-sky survey alert streams. I estimate several progenitor properties and explosion physics parameters, including zero-age main-sequence (ZAMS) mass, mass-loss rate, kinetic energy, 56 Ni mass synthesized, host extinction, and the time of the explosion. This work involves simulations of real-time of evolving incomplete light curves of the sample (∆t < 25 days, ∆t < 50 days, all data) leading to the conclusion that certain physical parameters exhibit greater reliability as indicators of true values during early epochs. This study emphasises the vital role of real-time modeling of transients, supported by multi-band synthetic light curves tailored to survey passbands, for identifying interesting transients based on their progenitor and explosion properties and determining critical epochs for follow-up observations.

In my thesis, I report multi wavelength observations and characterization of the ultraluminous transient AT 2021lwx (ZTF20abrbeie; aka“Barbie”) identified in the ZTF alert stream, that was flagged as an anomaly by the Recommender Engine For Intelligent Transient Track-ing (REFITT). From a spectroscopically measured redshift of 0.9945, and slowly fading g and r light curves spanning over 1000 observer-frame days that peak with an absolute magnitude of Mr = −25.7 mag, AT 2021lwx has an extraordinary peak pseudo-bolometric luminosity of log (Lmax/[erg/s]) = 45.7. The total radiative energy is over 10 53 erg, and as of today, the transient continues to decline slowly following a t −5/3 power-law. Modeling available photometry with MOSFiT suggests that AT 2021lwx is a tidal disruption event (TDE) candidate involving a ≈ 14 or 15 solar mass star accreting onto a supermassive black hole (SMBH) with mass M BH ≈ 10 8 solar mass. But, intriguingly, no host galaxy associated with the theorized SMBH is detected yet. The Pan-STARRS non-detections do not definitively exclude the existence of a galaxy hosting AT 2021lwx. Utilizing EzGal, upper limits on the stellar mass for different stellar population models were determined. These upper limits suggest that a 10 10 solar mass host galaxy cannot be ruled out.

The enhanced sensitivity of upcoming large-scale all-sky surveys enables the early detection of transients, providing unique insights into their progenitor systems, an example being detection of shock cooling emission (SCE) in light curves of stripped-envelope supernovae(SESNe). Leveraging a statistically significant sample of these events with early detections from all-sky surveys presents an invaluable opportunity to constrain their environments, pro-genitors, and explosion properties. In my final study contributing to this thesis, I analyze a sample of 16 SESNe identified from the ZTF survey, characterised by prominent shock cooling emission features in their light curves. By modeling the SCE and the radioactive peak in these transients, I derive estimates of progenitor radius, mass of the extended envelope and explosion properties of SESNe. This analysis yields upper limits and ranges for the compactness and envelope structures of the SESN progenitors that exhibit SCE in their light curves. I conclude my thesis with a summary of the findings and their future applications.

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  • Physics and Astronomy

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  • Stellar astronomy and planetary systems

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A phosphate surprise, from a young solar system, hints at life’s building blocks, what’s next.

  • Early analysis of the asteroid Bennu sample returned by NASA’s OSIRIS-REx mission has revealed dust rich in carbon, nitrogen, and organic compounds, all of which are essential components for life as we know it. Dominated by clay minerals, particularly serpentine, the sample mirrors the type of rock found at mid-ocean ridges on Earth.
  • The magnesium-sodium phosphate found in the sample hints that the asteroid could have splintered off from an ancient, small, primitive ocean world. The phosphate was a surprise to the team because the mineral had not been detected by the OSIRIS-REx spacecraft while at Bennu.
  • While a similar phosphate was found in the asteroid Ryugu sample delivered by JAXA’s (Japan Aerospace Exploration Agency) Hayabusa2 mission in 2020, the magnesium-sodium phosphate detected in the Bennu sample stands out for its purity (that is, the lack of other materials included in the mineral) and the size of its grains, unprecedented in any meteorite sample.

Scientists have eagerly awaited the opportunity to dig into the 4.3-ounce (121.6-gram) pristine asteroid Bennu sample collected by NASA’s OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, and Security – Regolith Explorer) mission since it was delivered to Earth last fall. They hoped the material would hold secrets of the solar system’s past and the prebiotic chemistry that might have led to the origin of life on Earth. An early analysis of the Bennu sample, published June 26 in Meteoritics & Planetary Science , demonstrates this excitement was warranted.

The OSIRIS-REx Sample Analysis Team found that Bennu contains the original ingredients that formed our solar system. The asteroid’s dust is rich in carbon and nitrogen, as well as organic compounds, all of which are essential components for life as we know it. The sample also contains magnesium-sodium phosphate, which was a surprise to the research team, because it wasn’t seen in the remote sensing data collected by the spacecraft at Bennu. Its presence in the sample hints that the asteroid could have splintered off from a long-gone, tiny, primitive ocean world.

Analysis of the Bennu sample unveiled intriguing insights into the asteroid’s composition. Dominated by clay minerals, particularly serpentine, the sample mirrors the type of rock found at mid-ocean ridges on Earth, where material from the mantle, the layer beneath Earth’s crust, encounters water.

This interaction doesn’t just result in clay formation; it also gives rise to a variety of minerals like carbonates, iron oxides, and iron sulfides. But the most unexpected discovery is the presence of water-soluble phosphates. These compounds are components of biochemistry for all known life on Earth today.

example of a scientific thesis statement

While a similar phosphate was found in the asteroid Ryugu sample delivered by JAXA’s (Japan Aerospace Exploration Agency) Hayabusa2 mission in 2020, the magnesium-sodium phosphate detected in the Bennu sample stands out for its purity — that is, the lack of other materials in the mineral — and the size of its grains, unprecedented in any meteorite sample.

The finding of magnesium-sodium phosphates in the Bennu sample raises questions about the geochemical processes that concentrated these elements and provides valuable clues about Bennu’s historic conditions.

“The presence and state of phosphates, along with other elements and compounds on Bennu, suggest a watery past for the asteroid,” said Dante Lauretta, co-lead author of the paper and principal investigator for OSIRIS-REx at the University of Arizona, Tucson. “Bennu potentially could have once been part of a wetter world. Although, this hypothesis requires further investigation.”

“OSIRIS-REx gave us exactly what we hoped: a large pristine asteroid sample rich in nitrogen and carbon from a formerly wet world,” said Jason Dworkin , a co-author on the paper and the OSIRIS-REx project scientist at NASA’s Goddard Space Flight Center in Greenbelt, Maryland.

Despite its possible history of interaction with water, Bennu remains a chemically primitive asteroid, with elemental proportions closely resembling those of the Sun.

“The sample we returned is the largest reservoir of unaltered asteroid material on Earth right now,” said Lauretta.

This composition offers a glimpse into the early days of our solar system, over 4.5 billion years ago. These rocks have retained their original state, having neither melted nor resolidified since their inception, affirming their ancient origins.

The team has confirmed the asteroid is rich in carbon and nitrogen. These elements are crucial in understanding the environments where Bennu’s materials originated and the chemical processes that transformed simple elements into complex molecules, potentially laying the groundwork for life on Earth.

“These findings underscore the importance of collecting and studying material from asteroids like Bennu — especially low-density material that would typically burn up upon entering Earth’s atmosphere,” said Lauretta. “This material holds the key to unraveling the intricate processes of solar system formation and the prebiotic chemistry that could have contributed to life emerging on Earth.”

Dozens more labs in the United States and around the world will receive portions of the Bennu sample from NASA’s Johnson Space Center in Houston in the coming months, and many more scientific papers describing analyses of the Bennu sample are expected in the next few years from the OSIRIS-REx Sample Analysis Team.

“The Bennu samples are tantalizingly beautiful extraterrestrial rocks,” said Harold Connolly, co-lead author on the paper and OSIRIS-REx mission sample scientist at Rowan University in Glassboro, New Jersey. “Each week, analysis by the OSIRIS-REx Sample Analysis Team provides new and sometimes surprising findings that are helping place important constraints on the origin and evolution of Earth-like planets.”

Launched on Sept. 8, 2016, the OSIRIS-REx spacecraft traveled to near-Earth asteroid Bennu and collected a sample of rocks and dust from the surface. OSIRIS-REx, the first U.S. mission to collect a sample from an asteroid, delivered the sample to Earth on Sept. 24, 2023.

NASA’s Goddard Space Flight Center in Greenbelt, Maryland, provided overall mission management, systems engineering, and the safety and mission assurance for OSIRIS-REx. Dante Lauretta of the University of Arizona, Tucson, is the principal investigator. The university leads the science team and the mission’s science observation planning and data processing. Lockheed Martin Space in Littleton, Colorado, built the spacecraft and provided flight operations. Goddard and KinetX Aerospace were responsible for navigating the OSIRIS-REx spacecraft. Curation for OSIRIS-REx takes place at NASA Johnson. International partnerships on this mission include the OSIRIS-REx Laser Altimeter instrument from CSA (Canadian Space Agency) and asteroid sample science collaboration with JAXA’s Hayabusa2 mission. OSIRIS-REx is the third mission in NASA’s New Frontiers Program, managed by NASA’s Marshall Space Flight Center in Huntsville, Alabama, for the agency’s Science Mission Directorate in Washington.

Find more information about NASA’s OSIRIS-REx mission at:

https://www.nasa.gov/osiris-rex

By Mikayla Mace Kelley University of Arizona, Tucson

News Media Contacts

Karen Fox / Erin Morton NASA Headquarters, Washington 202-385-1287 / 202-805-9393 [email protected]  /  [email protected]  

Rani Gran NASA’s Goddard Space Flight Center, Greenbelt, Md. 301-332-6975 [email protected]

Related Terms

  • OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, Security-Regolith Explorer)
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Brazil star Neymar dribbles a ball towards goal

Science is just starting to understand the benefits of athletes putting their brains in ‘auto pilot’

example of a scientific thesis statement

Adjunct Research Fellow in Sports Coaching, The University of Queensland

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Michael John O'Keeffe does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

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In a much-publicised 2014 study , two Japanese neuroscience researchers found Brazilian soccer star Neymar used 90% less of his brain capacity – measured by neuron signals – compared to a group of Spanish second division players.

In simple terms, it was as if his brain was on auto pilot compared to the lower-level athletes.

The study highlighted the old adage that “the majority of elite sport is played above the neck”, but its impact on sports coaching was constrained by a lack of understanding of how athletes’ brains worked.

More recent research under the umbrella label of “predictive processing” is able to shed light on this phenomenon with practical implications for sports coaching.

What is predictive processing?

Predictive processing breaks with the longstanding view of the brain as a computer that somehow sifts through all the sensory information it constantly receives, prioritises what is important and then decides on what action to take.

Instead, those who believe in predictive processing view the brain as constantly predicting its input based on best-bet estimations via its predictive model. It’s a case of “we see what we believe” rather than “we believe what we see”.

Of course, being a prediction, there will be some errors or surprises. Critically, it is only these errors or surprises which are processed by the brain, leading to action.

A practical example of predictive processing

Consider the following scenario.

After driving home from work listening to talkback radio, it struck me that I had no memory of the 20-minute trip.

Why? The predictive processing view of the brain has a simple and powerful explanation.

During the trip, which was uneventful, my predictive model of traffic on that specific route meshed with the sensory information during the drive. There were no surprises, such as an accident or detour, that required further processing.

In the event of an accident or a detour, further processing would have been generated, triggering increased attention.

In contrast, my grandson Hugo, who has had his “P” licence for a week, is still developing his traffic predictive model and has to process significantly more information in the model building process.

He is like a second-division soccer player compared to my Neymar when it comes to driving.

My predictive model worked because it recognised the likely predictive models of other road users. But if I saw a young man on a motorised scooter without a helmet, it would trigger attention as I’d be less sure of his traffic predictive model and likely couldn’t anticipate his behaviour.

When things go as expected, our brains don’t have to work as hard. But when surprises happen, our brains have to work harder.

Predictive processing in sports

The traffic analogy can be extended to team sports like Australian rules football.

A defender will have a different predictive model compared to the forwards. Teams do not have to have identical shared predictive models, but rather compatible models so players can anticipate the actions of teammates.

According to predictive processing, learning is the process of building and refining one’s predictive model over time. Prediction errors or surprises are the learning trigger .

Predictive processing also distinguishes two types of learning.

The first is finetuning one’s predictive model, such as an athlete learning their coach’s strategy and skill execution.

The second is when a current predictive model is no longer appropriate because the environment has changed and a new predictive model is required.

Take the case of an Irish footballer who moves to Australia to play AFL , picking up an Australian rules football for the first time. Their Gaelic football predictive model is no longer appropriate given the introduction of tackling and kicking with an oval-shaped, not a round, ball.

Irish players have to not only learn new skills, such as tackling, but also how to play their role in the team game plan.

In the driving analogy, they have to learn to drive a different vehicle in traffic. And they need to understand and anticipate the behaviour of teammates and the opposition.

The element of surprise at training

From a coaching perspective, athletes must be challenged by surprises to improve their predictive processing.

A coach should therefore design training sessions that provide unexpected variations from established patterns.

Rather than striving for perfectly executed training drills, a coach should create disruptions and surprises that force athletes to learn new and hopefully creative patterns of behaviour.

As the athlete’s predictive model improves, they require fewer cognitive resources, which can result in improved anticipation and ability to withstand pressure .

As a community youth soccer coach, I’ve experimented with a number of innovations with the aim of creating surprises.

For instance, we played a seven-on-seven small-sided game (on a smaller pitch) where players were limited to one touch only.

A number of players complained they were not skilled enough, but with encouragement, were prepared to give it a go.

I had no idea how the game would work. Interestingly, the players were more conscious of the game situation and how they would pass the ball after receiving it – they didn’t have the time to receive and control the ball before making a decision.

Other surprise innovations can include playing a small-sided game with a different type of ball, giving players a card that specifies the number of touches they are allowed and whether they have to pass forwards or backwards, or using headbands instead of bibs to distinguish between teams.

Coaches can then discuss how the athletes adjusted, what they learned, and how to apply the learnings in a competitive game.

Not many athletes will ever reach Neymar’s heights, but perhaps understanding and improving predictive processing can help them become the best versions of themselves.

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  23. Surprising Phosphate Finding in NASA's OSIRIS-REx Asteroid Sample

    The sample also contains magnesium-sodium phosphate, which was a surprise to the research team, because it wasn't seen in the remote sensing data collected by the spacecraft at Bennu. Its presence in the sample hints that the asteroid could have splintered off from a long-gone, tiny, primitive ocean world. A Phosphate Surprise

  24. Science is just starting to understand the benefits of athletes putting

    Disclosure statement. Michael John O'Keeffe does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no ...