What Task 1 Is — and What It Is Not
IELTS Academic Writing Task 1 presents visual data — a line graph, bar chart, pie chart, table, map, process diagram, or a combination — and asks the candidate to summarise the key features and make comparisons where relevant. The response must be at least 150 words and is expected to take approximately 20 minutes.
Task 1 contributes one-third of the total Writing band score (Task 2 contributes two-thirds). Candidates who spend more than 20 minutes on Task 1 are investing time in the lower-weighted task. The practical consequence is that Task 2, which has double the weighting, receives less time and typically produces a weaker response than it would have otherwise.
Task 1 is scored against four criteria: Task Achievement (not Task Response, which applies to Task 2), Coherence and Cohesion, Lexical Resource, and Grammatical Range and Accuracy. Task Achievement is where Task 1 responses most often fall short. It assesses whether the response clearly covers the key features, presents a clear overview, and accurately references the data.
Task 1 is a description, not an analysis. It does not require an opinion, a recommendation, or an explanation of causes. If the graph shows that smartphone adoption rose between 2010 and 2020, the task is to describe that rise accurately — not to explain why it happened.
The Overview — the Most Important Paragraph
The overview is a short paragraph — two or three sentences — that states the most significant trends or features visible in the data without reference to specific numbers. It answers the question: if someone could not see the graph, what is the single most important thing to understand about it?
At Band 7, an overview is present and clear. Below Band 6, an overview is often missing entirely — the response moves directly from a paraphrase of the title into a point-by-point description of the data. Without an overview, the Task Achievement criterion cannot reach Band 7 regardless of how accurately the details are described.
"The graph shows the percentage of households with internet access in four countries from 2005 to 2020. In 2005, Country A had 30% internet access. By 2010, this had risen to 55%..."
The response moves directly into figures. A reader would need to follow every number to understand the overall pattern.
"The graph illustrates changes in household internet access across four countries between 2005 and 2020. Overall, all four countries recorded significant growth over the period, with Country A showing the steepest rise and Country D consistently recording the lowest rates throughout."
A reader understands the shape of the data before any specific numbers are introduced. The overview identifies the main trend (growth across all) and the most notable feature (Country A highest, Country D lowest).
Selecting and Comparing — Not Describing Everything
The task instruction says "summarise the key features and make comparisons where relevant." The word "summarise" is the key — the task does not ask for a complete description of every data point. A line graph with five data series spanning 20 years may have 100 individual data points. Including all of them in 150 words is impossible, and attempting to do so produces a response that reads as a list rather than a coherent description.
Selection requires judgement. The key features of a graph are the highest and lowest values, the most pronounced trends (steepest rise or fall), any convergence or divergence between data series, and any unusual features (plateaus, sharp reversals). Specific figures should be used to illustrate the features, not to catalogue every value.
Choose three or four key features. For each, give the trend or comparison and one or two specific values as evidence. This produces a response that is accurate, well-selected, and within the word count — without running out of things to say or padding with every number on the graph.
Vocabulary for Trends and Static Data
Task 1 vocabulary operates across two categories: language for change over time (trend vocabulary) and language for comparing values at a single point (comparative and superlative vocabulary). A candidate who uses only one category for a graph that contains both appears limited on Lexical Resource.
The adverbs of degree — sharply, significantly, gradually, slightly, marginally — add precision. The rate of change in a line graph is a key feature and should be qualified: "rose sharply" and "increased slightly" describe different data even when the absolute values are similar.
Task Types and What Each Requires
| Visual Type | Key Feature | What the Overview Addresses |
|---|---|---|
| Line graph | Trends over time | Overall direction for all data series; most notable trend or outlier |
| Bar chart | Comparison at one or several time points | Highest and lowest categories; any general pattern across categories |
| Pie chart | Proportions (often two pies, two time points) | Dominant category; most notable change between pies (if two) |
| Table | Multiple variables, often time and category | Overall highest and lowest values; any general pattern across rows or columns |
| Map | Changes in a place between two time points | Overall character of change (e.g., development of previously empty land; removal of features) |
| Process diagram | Stages in a cycle or linear process | Total number of stages; whether the process is cyclical or linear; overall purpose |
Common Task Achievement Errors
No overview paragraph. The most frequent Band 6 error. Described above. Adding a two-sentence overview at the end (or beginning, after the introduction paraphrase) moves Task Achievement from Band 5–6 to Band 7 range, provided the overview identifies the correct key features.
Incorrect data. Misreading a graph value, writing 35% when the graph shows 53%, or confusing two data series. At Band 7, data must be accurately referenced. Approximation is acceptable ("approximately 40%"), but systematic misreading of the graph is penalised under Task Achievement.
Including personal opinion. "This increase is worrying" or "the government should address this decline." Task 1 describes, it does not evaluate. Including opinion does not technically lose a mark on Task Achievement, but it signals a misunderstanding of the task type and typically displaces description that would have scored more.
Calculating values not shown in the data. If a pie chart shows percentages for six categories and the candidate calculates the difference between two categories and presents that figure, the figure is derived rather than read from the graph. Unless a calculation is trivially obvious, describe what is shown rather than what can be inferred through arithmetic.
Task 1 shares its description vocabulary with data-heavy academic writing more broadly. The linear regression post and PCA tutorial in the data analysis pillar cover similar language in the context of statistical outputs — candidates who work with quantitative data professionally will find the vocabulary overlaps considerably.
The Writing Task 2 guide covers the essay structure for the higher-weighted task. For feedback on Task 1 responses including overview accuracy, data selection, and vocabulary range, see the IELTS tutoring service.
Sajjadur Rahman
IELTS Tutor · University of DhakaOffers IELTS Writing preparation including Task 1 feedback on overview quality, data accuracy, and vocabulary range, plus Task 2 criterion-specific guidance for Band 7 targets.