Quick answer: In IELTS Academic Writing Task 1 you summarise a chart, graph, table, map or process in at least 150 words in about 20 minutes. Write four short paragraphs: an introduction that paraphrases what the visual shows, an overview of the main trends or biggest features, and two paragraphs of specific detail with figures. You are not asked for your opinion - just an accurate, well-organised report of the key information. Below is the structure and the exact language you need to describe data.
Want to practise on a full Academic Task 1 question? Use the free IELTS practice test.
What Academic Task 1 asks
You are shown visual information - most often a line graph, bar chart, pie chart or table, sometimes a map or a process diagram - and asked to "summarise the information by selecting and reporting the main features, and make comparisons where relevant." Three things follow from that instruction:
- Select the important features - you cannot describe every number, so pick the biggest, the smallest and the clearest trends.
- Report them accurately, with figures to support what you say.
- Compare where the data invites it - highest versus lowest, fastest-rising versus falling.
You must not explain why the data looks as it does or give your opinion. That is Task 2's job, and adding it here costs you Task Achievement marks.
A four-paragraph structure
This shape works for almost any data visual:
- Introduction (1 sentence). Paraphrase the question - say what the chart shows, over what period, in what units.
- Overview (2–3 sentences). State the main trends or the most striking features without specific numbers. This is the most important paragraph for your band.
- Detail paragraph 1. Describe one logical group of data with supporting figures.
- Detail paragraph 2. Describe the rest, again with figures and comparisons.
Examiners look specifically for a clear overview. An answer with no overview is capped on Task Achievement no matter how much detail it contains, so never skip that second paragraph.
The data-language toolkit
Most Task 1 marks for vocabulary come from describing change precisely. Build these into your practice.
Verbs and nouns for change
- Rise: increase, rise, grow, climb, surge (noun forms: an increase, a rise, growth, a surge).
- Fall: decrease, fall, decline, drop, plummet (a decrease, a fall, a decline, a drop).
- No change: remain stable, stay constant, level off, plateau.
- Up and down: fluctuate, vary.
- Peak and low: reach a peak, peak at, hit a low, bottom out.
Describing the size and speed of change
- Big change: a sharp / dramatic / significant / substantial rise; sales rose sharply.
- Small change: a slight / gradual / marginal / modest increase; prices rose slightly.
- Speed: a rapid rise, a steady increase, a gradual decline.
Language for comparison and proportion
- twice as high as, three times greater than, roughly half of;
- the highest / lowest figure, the largest proportion, a minority, the majority;
- compared with, in contrast, whereas, while.
Being precise with figures
Use "approximately", "just over", "just under", "around" and "nearly" so you are accurate without pretending to read exact values. "Sales stood at just over 40,000" is safer and more natural than a false-precise "40,137".
A worked example (original data)
Imagine a line graph showing the number of visitors, in millions, to three fictional museums - Riverside, Old Town and the Science Gallery - between 2010 and 2020. Here is how a strong answer opens:
Introduction: "The line graph illustrates how many people, in millions, visited three museums - Riverside, Old Town and the Science Gallery - over a ten-year period from 2010 to 2020."
Overview: "Overall, visitor numbers rose at all three museums across the decade, but the Science Gallery saw by far the strongest growth, overtaking the other two by the end of the period. Old Town, which was the most popular in 2010, grew only modestly and finished as the least visited."
Detail 1: "In 2010, Old Town attracted the most visitors, at around 3 million, while the Science Gallery drew fewer than 1 million. Over the following years, Old Town's figures climbed gradually, reaching approximately 3.5 million by 2020 - an increase of only half a million."
Detail 2: "The Science Gallery, by contrast, grew rapidly, roughly quadrupling from under 1 million to about 4 million and becoming the busiest of the three. Riverside followed a steadier path, rising from just over 2 million to around 3 million over the same period."
That answer selects the main features, gives a genuine overview, supports every claim with an approximate figure, and makes comparisons - exactly the four things the task rewards.
Not sure how your Task 1 reports would score? A tutor can mark one against all four criteria - see GE's IELTS Writing Feedback service.
Common Task 1 mistakes
- No overview. The single most damaging omission. Always include the "big picture" paragraph.
- Listing every number. Selecting the key features is the skill; a wall of figures with no shape scores poorly.
- Explaining causes or giving opinions. Task 1 is a factual report only.
- Copying the question wording. Paraphrase the prompt; copied words are not counted toward your 150.
- Writing under 150 words. As with Task 2, under-length answers are penalised.
Frequently asked questions
How long should IELTS Academic Task 1 be?
At least 150 words, written in about 20 minutes. Aim for roughly 160–190 - enough to give an overview and two detail paragraphs without eating into your Task 2 time.Do I need to include specific numbers?
Yes, in the detail paragraphs. Support your descriptions with figures from the chart, using words like "approximately" and "just over" so you are accurate without claiming false precision. Keep numbers out of the overview paragraph, though.What is the overview and why does it matter so much?
The overview is a short paragraph stating the main trends or most striking features of the data, without specific numbers. Examiners look for it directly: an answer with no clear overview is capped on Task Achievement, so it is the paragraph you can least afford to skip.Should I describe every part of the chart?
No. The instruction is to select and report the main features. Pick the highest and lowest values, the biggest changes and the clearest comparisons. Trying to describe every data point wastes words and hides the important trends.Can I give my opinion in Academic Task 1?
No. Task 1 is a factual summary - no opinions, no reasons for the data, no recommendations. Save analysis and opinion for Task 2, where they are required.What if the task shows a map or a process instead of a graph?
The same four-paragraph logic applies. For a map, describe the main changes between the two versions (what was added, removed or moved); for a process, describe the stages in order using sequencing language ("first", "next", "after that", "finally"). You still open with a paraphrase and an overview.For the essay task, see How to Write an IELTS Task 2 Essay, and for the full picture read our pillar, IELTS Writing: How to Structure Essays and Improve Your Band Score. Once you pass, teaching English abroad with a TEFL course is a natural next step.
All data, museum names and model text above are invented for this guide and do not reproduce any real exam material.