How to Write a Thesis Statement: A Six-Question Test and 10 Before/After Examples

October 25, 2026 · Essay writing

Ask any marker what separates a 2:1 from a 2:2, or a B+ from a C, and the thesis statement comes up quickly. A paper can be well researched and cleanly written and still feel aimless if its central claim is vague. The good news: a thesis is one sentence, and there is a short, reliable test for whether it works.

What a thesis statement is (and is not)

The UNC Writing Center describes the thesis as a sentence, usually at the end of the first paragraph, that states your interpretation of the subject and tells the reader how the rest of the paper will support it. Three things follow from that definition:

• It is a claim, not a topic. "Social media and teenagers" is a topic.
• It is arguable. If nobody could reasonably disagree, it is a summary.
• It is a roadmap. A reader should be able to guess the shape of your paper from it.

Assignments that ask you to analyse, interpret, compare, explain causes or take a position almost always expect a thesis, even when the prompt does not use the word. If in doubt, ask your tutor.

Match the thesis to the type of paper

The Purdue Online Writing Lab distinguishes three common types:

• Analytical: you break an issue or text into parts and evaluate them. "An analysis of the admissions process reveals one main challenge facing counsellors: …"
• Expository: you explain something. "The life of a typical first-year student is shaped by three demands: …"
• Argumentative: you make a claim and defend it with evidence. "Universities should …, because …"

The argumentative version is the one most essays ask for, and the one our guide to structuring an argumentative essay builds on.

Start with a working thesis, then revise it

Strong theses rarely arrive first. UNC's advice is that a thesis comes after thinking: gather evidence, notice patterns and tensions, then ask why they matter. Write a working thesis to guide your reading and drafting, and expect to change it. Purdue makes the same point: if your paper moves in a different direction while you write, revise the thesis so it matches what the paper actually argues.

A practical method:

1. Turn the prompt into a question. "Discuss the impact of remote learning" becomes "Did remote learning help or harm first-year students, and how?"
2. Write a one-sentence answer, however rough.
3. Add the "because": the two or three reasons you expect to defend.
4. After drafting, check that every body paragraph supports one of those reasons, and rewrite the sentence to match the paper you wrote.

The six-question test

UNC's handout gives a set of questions to run your working thesis through. They are worth memorising:

1. Do I answer the question? Re-read the prompt. A thesis that is interesting but off-topic still fails.
2. Have I taken a position others might challenge? If not, you are summarising.
3. Is it specific enough? Words like "good", "important" or "successful" need replacing with what you actually mean.
4. Does it pass the "how and why?" test? If a reader would immediately ask how or why, put the answer into the sentence.
5. Does it pass the "so what?" test? Show why the claim matters, or connect it to a larger issue.
6. Does the essay support it without wandering? The thesis and the body must match; change whichever is wrong.

10 before/after examples

Each pair shows a common weakness and one way to fix it. The "after" versions are examples of form, not positions you have to hold.

1. Announcement. Before: This essay will discuss climate policy. After: Carbon pricing has cut emissions more cheaply than subsidies in the countries that adopted it, which is why it should be the centre of national climate policy.
2. Fact, not claim. Before: Many students work part-time. After: Part-time work above about fifteen hours a week appears to hurt academic results, so universities should schedule core teaching to protect working students. (If you use a figure like this, it must come from a cited study.)
3. Too broad. Before: Technology has changed education. After: Lecture recording has improved revision for most students but reduced attendance in first-year modules, so it works best when paired with compulsory seminars.
4. Vague value word. Before: Shakespeare's Macbeth is a great play. After: Macbeth presents ambition not as a flaw in one man but as a pressure the play's whole social world exerts on him.
5. Question instead of answer. Before: Should voting be compulsory? After: Compulsory voting raises turnout most among groups that vote least, which makes elected bodies more representative.
6. List with no logic. Before: Social media affects sleep, mood and grades. After: Late-night social media use harms grades mainly through lost sleep rather than distraction, which suggests that bedtime habits, not app bans, are the place to intervene.
7. Unarguable. Before: Pollution is bad for health. After: Low-emission zones are a cost-effective way for cities to reduce childhood asthma admissions.
8. Two theses at once. Before: Remote work boosts productivity and cities should build more housing. After: choose one, or link them: Because remote work weakens the link between job and location, cities should plan housing for residents who no longer commute daily.
9. No "so what". Before: The novel uses many images of water. After: The novel's recurring images of water track the narrator's loss of control, turning a family story into a study of grief.
10. Too absolute. Before: Homework is useless. After: Homework has little measurable benefit in primary school but a clearer one in secondary school, so its volume should rise with age. (Qualifying words such as "little" or "clearer" are not weakness; they make a claim defensible.)

Where the thesis goes, and how long it should be

In most short essays, the thesis is the last sentence of the introduction, where the reader expects it. Longer papers sometimes need two sentences: one for the claim, one for the roadmap ("First I show …, then …"). One sentence is the default; if yours runs to four lines, it is probably carrying two ideas. Our guide to introductions and conclusions shows how to lead up to it.

A note on integrity

A thesis is the most personal sentence in your paper: it is your answer to the question. Use examples like the ones above to learn the pattern, not to borrow a position. Your university's academic integrity policy is the rule that applies; if you are unsure whether a form of help is allowed, ask your tutor or the writing centre.

Sources

• The Writing Center, University of North Carolina at Chapel Hill, Thesis Statements.
• Purdue Online Writing Lab, Tips and Examples for Writing Thesis Statements.

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