thesis based paper

The Ultimate Guide to Writing a Thesis Statement

A thesis statement is a sentence in a paper or essay (in the opening paragraph) that introduces the main topic to the reader. As one of the first things your reader sees, your thesis statement is one of the most important sentences in your entire paper—but also one of the hardest to write! 

In this article, we explain how to write a thesis statement in the best way possible. We look at what to include and the steps to take for writing your own, along with plenty of thesis statement examples to guide you. 

Here’s a tip: Want to make sure your writing shines? Grammarly can check your spelling and save you from grammar and punctuation mistakes. It even proofreads your text, so your work is polished wherever you write.

Your writing, at its best Grammarly helps you communicate confidently Write with Grammarly

Table of contents

What is a thesis statement, how to write a thesis statement: basics, what to include in a thesis statement (with examples), how to write a thesis statement in 3 steps.

The goal of a thesis statement is to let your reader know what your paper or essay is about. It helps your reader understand the greater context and scope of your topic, plus it lets your readers know what to expect from the rest of the work. 

A secondary benefit of a thesis statement is that it makes it easier to search for papers on a particular topic, especially in the realm of academic writing like research papers and thesis papers (which are sometimes known as dissertations when written for doctoral degrees). For example, if you’re writing a paper of your own, you’ll want to look up other papers to use as evidence and sources . You can simply scan the thesis statements of several papers to see which match your topic and could be worthwhile sources to cite. 

Before we get into details, here are the basic steps for how to write a thesis statement: 

• Develop the best topic to cover in your paper
• Phrase your topic as a question-and-answer
• Add some polish

We ’ ll describe each of those steps in more detail below, but we wanted to share a quick guide. Also, we ’ ll provide some thesis statement examples and talk about how to write a thesis statement for different kinds of essays: persuasive, compare-and-contrast, expository, and argumentative essays.

The thesis statement is located at the beginning of a paper, in the opening paragraph, making it an essential way to start an essay . A thesis statement isn’t necessarily the first sentence in an essay; typically you’ll want to hook the reader in an engaging way in the opening sentence before inserting your central idea or argument later in the first paragraph. A thesis statement is often confused with a topic sentence , the first sentence in a paragraph, because they both introduce the central idea of what follows. You can think of thesis statements as the topic sentence of your entire paper.  

Thesis statements are a necessary part of paper and essay writing , but different formats have different rules and best practices. Below, we break down how to write a thesis statement for the most common types of papers. 

How to write a thesis statement for expository and argumentative essays

Expository and argumentative essays are some of the most common types of academic papers. Because they don’t have a formal abstract like research papers, they rely on their thesis statements to provide an overview of what’s discussed. 

Thesis statements for argumentative and expository essays should use strong and decisive language; don’t be wishy-washy or uncertain. You want to take a stand right in the opening so that your readers understand what your paper is trying to show. 

Moreover, thesis statements for these essays should be specific, with some minor details to hint at the rest of the paper. It’s not enough to merely make your point; you also want to provide some basic evidence or background context to paint a full picture. 

If your paper dives into different subtopics or categories, try to fit them into the thesis statement if you can. You don’t have to get into details here, but it’s nice to mention the different sections at the top so that the reader knows what to expect. 

Thesis statement examples

Despite the taboo, insects make an excellent food source and could stem humanity’s looming food shortage, based on both their protein output and the sustainability of farming them. 

The backlash to rock ’n’ roll music in the ’50s by religious groups and traditionalists actually boosted the genre’s popularity instead of diminishing it as intended.

How to write a thesis statement for persuasive essays

Similar to argumentative essays, persuasive essays follow many of the same guidelines for their thesis statements: decisive language, specific details, and mentions of subtopics. 

However, the main difference is that, while the thesis statements for argumentative and expository essays state facts, the thesis statements for persuasive essays state clear opinions . Still, the format is the same, and the opinions are often treated like facts, including conclusive language and citing evidence to support your claims. 

Furthermore, unlike with other essays, it’s appropriate to make emotional connections in a thesis statement in persuasive essays. This can actually be a clever strategy to start your essay off on a more personal, impactful note. 

Advertising should not be allowed in public schools because it’s a distraction from studies and may lead to misguided priorities among the school board, to say nothing of the materialist culture it promotes. 

Exotic pets provide the same love and companionship as conventional pets, so the laws regulating which animals can and cannot be kept as pets should be more relaxed.

How to write a thesis statement for compare-and-contrast essays

Thesis statements for compare-and-contrast essays are tricky because you have at least two topics to touch on instead of just one. The same general guidelines apply (decisive language, details, etc.), but you need to give equal attention to both your topics—otherwise, your essay will seem biased from the start. 

As always, your thesis statement should reflect what’s written in the rest of your essay. If your essay spends more time comparing than contrasting, your thesis statement should focus more on similarities than differences. 

It sometimes helps to give specific examples as well, but keep them simple and brief. Save the finer details for the body of your essay. 

Sean Connery and Daniel Craig are the two most popular actors to portray James Bond, but both have their own distinct and at times contradictory interpretations of the character. 

Now that you know what you’re aiming for, it’s time to sit down and write your own thesis statement. To keep you on track, here are three easy steps to guide you. 

1 Brainstorm the best topic for your essay

You can’t write a thesis statement until you know what your paper is about, so your first step is choosing a topic. 

If the topic is already assigned, great ! That’s all for this step. If not, consider the tips below for choosing the topic that’s best for you:

• Pick a topic that you’re passionate about. Even if you don’t know much about it, it’ll be easier to learn about it while writing if you’re genuinely interested. 
• Narrow down your topic to something specific; otherwise, your paper will be too broad and perhaps too long. Just make sure it’s not too specific, or you won’t have enough to write about. Try to find a happy medium. 
• Check beforehand that there are enough strong, credible sources to use for research. You don’t want to run out of referential material halfway through. 

Once you’ve chosen a topic—and the angle or stance you want to take—then it’s time to put the idea for your thesis sentence into words. 

2 Phrase your topic as a question and then answer it

It’s not always easy to fit your entire thesis into just one sentence, let alone one that’s written clearly and eloquently. Here’s a quick technique to help you get started. 

First, phrase your topic as a question. For example, if you want to write about Mahatma Gandhi’s legacy, ask yourself, “What influences did Gandhi have on society after his death?” 

If you already know the answer, write it down—that’s a good start for your thesis statement. If you don’t know the answer, do some preliminary research to find out; you can certainly use what you discover as evidence and sources in your essay’s body paragraphs . 

3 Add some polish

Chances are, your first attempt at a thesis statement won’t be perfect. To get it to its best, try revising , editing , and adding what’s missing. 

Remember the core traits for thesis statements we mentioned above: decisive language, a happy medium of specific but not too specific details, and mention of subtopics. If you’re struggling to contain everything in a single sentence, feel free to move the secondary information to the following sentence. The thesis statement itself should only have what’s most necessary. 

If you’re in doubt, read your thesis statement to a friend and ask them what they think your paper is about. If they answer correctly, your thesis statement does its job. 

Next comes the hard part—writing the rest! While the bulk of the writing lies ahead, at least you’ve nailed down your central idea. To plot out your supporting argument, follow our advice on essay structure and let your ideas flow. 

While Sandel argues that pursuing perfection through genetic engineering would decrease our sense of humility, he claims that the sense of solidarity we would lose is also important.

This thesis summarizes several points in Sandel’s argument, but it does not make a claim about how we should understand his argument. A reader who read Sandel’s argument would not also need to read an essay based on this descriptive thesis.  

Broad thesis (arguable, but difficult to support with evidence) 

Michael Sandel’s arguments about genetic engineering do not take into consideration all the relevant issues.

This is an arguable claim because it would be possible to argue against it by saying that Michael Sandel’s arguments do take all of the relevant issues into consideration. But the claim is too broad. Because the thesis does not specify which “issues” it is focused on—or why it matters if they are considered—readers won’t know what the rest of the essay will argue, and the writer won’t know what to focus on. If there is a particular issue that Sandel does not address, then a more specific version of the thesis would include that issue—hand an explanation of why it is important.  

Arguable thesis with analytical claim 

While Sandel argues persuasively that our instinct to “remake” (54) ourselves into something ever more perfect is a problem, his belief that we can always draw a line between what is medically necessary and what makes us simply “better than well” (51) is less convincing.

This is an arguable analytical claim. To argue for this claim, the essay writer will need to show how evidence from the article itself points to this interpretation. It’s also a reasonable scope for a thesis because it can be supported with evidence available in the text and is neither too broad nor too narrow.  

Arguable thesis with normative claim 

Given Sandel’s argument against genetic enhancement, we should not allow parents to decide on using Human Growth Hormone for their children.

This thesis tells us what we should do about a particular issue discussed in Sandel’s article, but it does not tell us how we should understand Sandel’s argument.  

Questions to ask about your thesis 

• Is the thesis truly arguable? Does it speak to a genuine dilemma in the source, or would most readers automatically agree with it?  
• Is the thesis too obvious? Again, would most or all readers agree with it without needing to see your argument?  
• Is the thesis complex enough to require a whole essay's worth of argument?  
• Is the thesis supportable with evidence from the text rather than with generalizations or outside research?  
• Would anyone want to read a paper in which this thesis was developed? That is, can you explain what this paper is adding to our understanding of a problem, question, or topic?
• picture_as_pdf Thesis

Purdue Online Writing Lab Purdue OWL® College of Liberal Arts

Tips and Examples for Writing Thesis Statements

Welcome to the Purdue OWL

This page is brought to you by the OWL at Purdue University. When printing this page, you must include the entire legal notice.

Copyright ©1995-2018 by The Writing Lab & The OWL at Purdue and Purdue University. All rights reserved. This material may not be published, reproduced, broadcast, rewritten, or redistributed without permission. Use of this site constitutes acceptance of our terms and conditions of fair use.

Tips for Writing Your Thesis Statement

1. Determine what kind of paper you are writing:

• An analytical paper breaks down an issue or an idea into its component parts, evaluates the issue or idea, and presents this breakdown and evaluation to the audience.
• An expository (explanatory) paper explains something to the audience.
• An argumentative paper makes a claim about a topic and justifies this claim with specific evidence. The claim could be an opinion, a policy proposal, an evaluation, a cause-and-effect statement, or an interpretation. The goal of the argumentative paper is to convince the audience that the claim is true based on the evidence provided.

If you are writing a text that does not fall under these three categories (e.g., a narrative), a thesis statement somewhere in the first paragraph could still be helpful to your reader.

2. Your thesis statement should be specific—it should cover only what you will discuss in your paper and should be supported with specific evidence.

3. The thesis statement usually appears at the end of the first paragraph of a paper.

4. Your topic may change as you write, so you may need to revise your thesis statement to reflect exactly what you have discussed in the paper.

Thesis Statement Examples

Example of an analytical thesis statement:

The paper that follows should:

• Explain the analysis of the college admission process
• Explain the challenge facing admissions counselors

Example of an expository (explanatory) thesis statement:

• Explain how students spend their time studying, attending class, and socializing with peers

Example of an argumentative thesis statement:

• Present an argument and give evidence to support the claim that students should pursue community projects before entering college