Key takeaways
- An overview is the single most important sentence in Academic Task 1: say what the main trends or changes are without quoting numbers.
- Write at least 150 words in about 20 minutes. Do not spend more than that, because Task 2 carries more weight.
- Choose details that support the overview, group similar data and compare, and never explain causes that the data does not show.
- Practise with real data tasks and check yourself against the four marking criteria.
In IELTS Academic Writing Task 1 you are given a chart, graph, table, map or process and asked to summarise it in at least 150 words. Many candidates lose marks for one reason: they describe every number but never tell the reader what the data shows as a whole. That missing summary is the overview, and writing it well is the quickest way to raise your Task 1 score.
What an overview is
An overview is one or two sentences that state the main trends, the biggest differences or the overall change, with no detailed figures. It answers the question 'what is the big picture?'. For a line graph that may be 'visitor numbers fell sharply and then recovered to a new high'. For a map it may be 'the village became more developed and more dependent on cars'. For a process it may be 'the process has seven stages and ends with the product being checked'.
A simple structure for Task 1
| Paragraph | Purpose | Typical length |
|---|---|---|
| Introduction | Paraphrase the task in one sentence: what the data shows, where and when | 1 sentence |
| Overview | State the main trends or features, with no detailed numbers | 2 sentences |
| Details 1 | Describe the first group of data, with key figures and a comparison | 3 to 4 sentences |
| Details 2 | Describe the second group, with key figures and a comparison | 3 to 4 sentences |
How to choose what to write
- Look for the highest and lowest values, the biggest change and any point where trends cross.
- Group items that behave alike, for example the two cities where car use fell most.
- Compare rather than list. 'City A fell by 14 points, whereas City B changed very little' is better than two separate sentences.
- Use accurate figures with units, and do not guess reasons.
Language you need
- Trends: rose, increased, climbed, fell, declined, remained stable, fluctuated.
- Degree: sharply, slightly, gradually, significantly.
- Comparison: whereas, while, higher than, the highest, twice as many as.
- Time: between 2018 and 2023, in the same period, by the end of the period.
- For maps and processes: the passive voice ('a bridge was built'), and sequence words such as first, then, finally.
A short worked example
Suppose a table shows monthly museum visitors: 120 thousand in 2018, 135 in 2019, 40 in 2020, 70 in 2021, 110 in 2022 and 140 in 2023. A strong overview would be: 'Visitor numbers rose before 2020, fell dramatically in 2020 and then recovered steadily to reach their highest level in 2023.' The detail paragraphs then give the key figures: the rise to 135, the fall to 40 and the recovery to 140.
Common mistakes
- Writing no overview, or hiding it in the conclusion where it is easy to miss.
- Listing every number instead of selecting the key ones.
- Giving opinions or reasons, such as 'because of the pandemic', when the task does not say so.
- Writing fewer than 150 words, or running far over and losing time for Task 2.
- Mixing tenses. Use the past for past years and a future form only when the chart shows a forecast.
Practise on timed tasks, and compare your answer with the model notes. Our IELTS Writing practice tests include Task 1 data, map and process questions with notes on what a strong answer covers. For the whole test, read the IELTS Writing complete guide and see how marks combine in IELTS band scores explained.
Frequently asked questions
How many words should an Academic Task 1 answer be?
At least 150 words. Most strong answers are between 160 and 190 words. Writing much more rarely helps and costs time you need for Task 2.
Do I need a conclusion in Task 1?
No. A clear overview is more important than a conclusion. If you have time, you can add one short closing sentence, but it must not repeat the overview word for word.
Should I include all the numbers?
No. Select the key figures that support the main trends and make comparisons. Listing everything usually lowers coherence.
Can I give reasons for the changes?
Only if the task gives them. Otherwise stick to what the data shows.