The IELTS Thesis Statement: The One Sentence Task Response Is Looking For

A thesis statement in IELTS Writing Task 2 is the sentence in your introduction where you answer the question you were asked. It is normally the last sentence of the introduction, it is one sentence long, and it is the sentence the Task Response criterion is reading for.

Most pages about it hand you a template to memorise. That is the wrong unit of advice. The sentence is easy to write once you know which criterion marks it and what that criterion asks for, so this page starts there.

What a thesis statement is, and what it is not

A Task 2 introduction normally does two jobs in two or three sentences.

1. The background sentence rewrites the topic of the question in your own words. It says what the essay is about.
2. The thesis statement says what you think about it, or what the essay will answer. It says what your answer is.

The two are often confused because both appear in the introduction. The difference is testable. Cover the question paper, read your introduction, and ask: after reading this, does the reader know my answer? If the reader knows only the topic, you have written a background sentence twice and no thesis.

"Traffic congestion in large cities has worsened every year for a decade" is a background sentence. "Raising the cost of driving would reduce congestion, but it cannot work alone" is a thesis statement. The first could introduce any position. The second cannot.

Which criterion actually marks it

The published band descriptors for Task 2 put the position under Task Response, not under Coherence and Cohesion. The wording matters, so here it is, criterion by band:

Three things follow from that table, and all three change how you write the sentence.

"Throughout the response" is the band 7 condition, not "in the introduction". A thesis statement is not a box to tick at the top of the page. It is a promise that the body paragraphs and the conclusion have to keep. If your thesis says the advantages outweigh the drawbacks and your second body paragraph quietly argues the opposite, the position is no longer clear throughout, whatever the introduction said. This is the difference between a concession that strengthens your case and a counter argument that replaces it.

An unclear position is a band 4 descriptor. Not a style problem. A position the reader cannot state back to you in one line sits near the bottom of the criterion.

Coherence and Cohesion is still involved, but differently. That criterion reads the organisation: whether each paragraph has a clear central topic and whether the progression is logical. A clear thesis helps it, because it tells the reader what each paragraph is for. It is not where the position is scored.

One thesis statement for each question type

The instruction words decide the shape of the sentence. Identify the question type from the statement first, then write the thesis to match the instruction, not to match a template you remember.

Four worked examples, all written for the same instruction they claim to answer:

• Agree or disagree. "I agree that free university education benefits a country, although the benefit depends on how the places are allocated."
• Discuss both views. "While the argument for punishment has force, I consider rehabilitation the more important purpose of a prison system."
• Advantages and disadvantages. "The drawbacks of living abroad are real, but in my view the professional gains outweigh them."
• Problem and solution. "The main cause is the low price of processed food, so the most effective response is a tax on sugar and fat rather than a public information campaign."

Notice what none of them does. None announces the essay. "In this essay, I will discuss both sides and give my opinion" is a sentence about the essay, not an answer to the question. It postpones the position to somewhere later in the paper, which is exactly what the band 6 and band 5 wording describes.

For the two part question, answer both halves briefly. A two part question with only one half answered loses marks under "addresses all parts of the task", which is the first bullet of the same criterion.

The two tests to run before you write the body

Test one: the instruction test. Put your thesis next to the instruction words and check they match. If the question says "to what extent", a thesis that says "there are advantages and disadvantages" answers a different question. If the question asks for causes and solutions, a thesis that only states an opinion about whether the problem is serious answers a different question. This is the most common way a well written essay goes off topic while sounding fine.

Test two: the conclusion test. Write your conclusion sentence immediately after your thesis, before you write any body paragraph. If the two disagree, your plan is the problem, not your wording. Fix the plan now, while it costs two sentences instead of forty minutes.

What 17 published answers actually did

The Bandly sample library has 17 Task 2 answers, each scored by the Bandly engine and published with the four criterion estimates on the page. I counted the openings. The method was simple enough to repeat: take the first paragraph of each answer, split it into sentences, and record which sentence commits to a position.

• In 14 of 17, the position is the final sentence of a separately paragraphed introduction. In the other 3, the answer has no paragraph breaks at all, and the position is sentence 3. There is no answer in the set where the position comes first.
• 16 of 17 commit within the first three sentences. The one exception reaches it in sentence 4, after two background sentences and a sentence describing what other people think.
• The median introduction is 62 words, so the whole job, background plus thesis, is done in two or three sentences.
• 3 answers announce the essay instead of answering the question, using some form of "in this essay I will discuss both sides". Those three hold overall estimates of 6.5, 7 and 7, which are the lowest in the set alongside one answer whose position agrees with both sides at once.

Two honest cautions about those numbers. Seventeen answers is a small set, and the bands on them are Bandly's estimates, not marks from a qualified examiner, so the pattern is a description of what the engine rewarded and not proof of what a human marker would do. What the counts do show is that a position in the last sentence of a short introduction is what the strongest answers in the library have in common, and that announcing the essay is a feature of the weakest.

A real opening, rewritten

This is the opening of the tourism answer in the library, which received a Task Response estimate of 7 and an overall estimate of 6.5. The question asked whether the advantages of tourism in developing countries outweigh the disadvantages.

In the recent years, tourism have grown very fast in many developing countries who need money to improve their economy. Many people think this is a bad thing because of the environment, but other people believe it is good. In this essay, I will discuss both sides and show that the advantages of tourism are bigger than the disadvantages.

Here is the same opening rewritten, with the reason for each change:

In recent years, tourism has grown rapidly in developing countries that need the income to strengthen their economies. Its environmental cost is real and well documented. In my view, however, the economic gains outweigh that cost, provided the revenue is spent on infrastructure rather than absorbed by foreign operators.

• "tourism have grown" became "tourism has grown", and "countries who" became "countries that". Both are Grammatical Range and Accuracy: subject and verb agreement, and the relative pronoun for a non human noun.
• "In this essay, I will discuss both sides and show that" became "In my view, however". The original postpones the answer and describes the essay; the replacement states the position. That is Task Response, and specifically the move from "the development is not always clear" towards "a clear position throughout the response".
• "the advantages are bigger than the disadvantages" became "the economic gains outweigh that cost, provided the revenue is spent on infrastructure". "Bigger" is accurate but weak, and "outweigh" is the collocation the question itself uses: Lexical Resource. The "provided" clause adds the limit on the claim, which is what gives the body paragraphs something specific to prove.
• "Many people think this is a bad thing because of the environment, but other people believe it is good" became one sentence naming the actual cost. The original spends 17 words reporting that opinions differ, which the examiner already knows from the question. That is Coherence and Cohesion, because the introduction now progresses instead of circling.

Memorised thesis lines, and what they cost

A memorised frame such as "This essay will discuss both views and in my opinion I believe that it is more advantageous" can be dropped into any question, which is precisely the problem. A sentence that fits every question answers none of them specifically, and under Lexical Resource a learned chunk is not evidence of your own range.

Keep the small connecting words by all means. "In my view", "I agree that" and "while X, I consider Y" are ordinary English, not memorised answers. The content after them has to come from the question in front of you.

Do this today

Take any Task 2 question, set a timer for three minutes, and write only two sentences: a background sentence and a thesis. Then run the two tests. Does the thesis answer the instruction words, and does your conclusion sentence still agree with it? Do that on five questions and the sentence stops being something you plan and becomes something you write.

When you want to see how the rest of the answer holds up against the position you set, paste a full essay into Bandly and read the Task Response feedback first. The four criterion bands it returns are estimates from a scoring engine, not marks from a qualified examiner, so treat them as a second reading of your work: useful for finding the sentence where your position went quiet, not a prediction of your test day result. For the standard you are aiming at, the band 7 samples show what a clear position looks like when it holds for the whole answer.