IELTS Writing Task 1 types: how to describe each chart

You turn the paper over, it's a process diagram, and you start writing about an "upward trend" as if it were a line graph. You describe changes that aren't there, and the tense drifts. It's a common Task 1 accident.

In Task 1, the chart type decides what you describe. Follow a trend, compare proportions, or walk through the stages of a process. Get the type wrong and you lose Task Achievement before you've written a sentence. This guide covers, for each of the seven Academic types, what the overview should capture, the tense you need, and what not to do.

The short answer

Academic Writing Task 1 charts fall into seven types: line graph, bar chart, pie chart, table, process diagram, map, and a combination of two. Each changes what you write.

One rule holds across all of them: you need an overview, one or two sentences naming the big picture. Without it, however accurate your figures, Task Achievement caps at Band 5 (the mechanism is in reading Task 1 across the four axes). What changes is what the overview captures: a trend for time series, sizes for a static comparison, stages for a process, changes for a map. Note that General Training Task 1 is a letter, not a chart, and works differently (more below).

The seven chart types

Spotting the type is the first move. Read the title and axes, and decide whether there's a time axis, proportions, a process, or a map.

1. Line graph

Shows change over time. The overview captures the overall trend: what rose or fell, and with several lines, which ends highest. Tense is past for a finished period, and future forms if a projection is included. The common failure is reading out one point at a time. Instead of walking 2000, then 2001, then 2002, sum up the movement across the whole period. The line graph deep dive has the full four-paragraph build and a Band 9 model.

2. Bar chart

Shows a comparison of categories. With a time axis it's a trend; without one, size is the centre of the overview. Name the largest and smallest and the standout gaps. Describe every bar with equal weight and it goes flat, because nothing is selected. The bar chart deep dive covers static vs dynamic and a Band 9 model.

3. Pie chart

Shows proportions as percentages, often two or more together. The overview captures the largest and smallest segment, or the biggest shift between the two pies. Use percentage language precisely (accounts for, makes up, a fifth of). The pie chart deep dive covers one pie versus two, grouping small segments, and a Band 9 model.

4. Table

Lays out numbers or percentages by category. The main trap is reading out every cell. In the overview, name the highest and lowest or the standout pattern, and in the body select only the figures that mean something. A table carries a lot of data, so selection is where the marks are. The table deep dive covers static versus dynamic tables, grouping by row or column, and a Band 9 model.

5. Process diagram

Shows the stages of how something is made or occurs in nature. This is where the rules change. There are no numbers and no trends. The overview gives the number of stages, the start and end points, and whether it's cyclical or linear. Tense is present simple, with heavy passive voice (the beans are dried, then they are roasted). Hunting for data to report is the biggest misread here. The process diagram deep dive covers natural vs man-made processes and a Band 9 model.

6. Map

Usually two maps side by side, asking about how a place changed over time. The overview gives the overall nature of the change, such as "the area became more built up as green space shrank." Tense is usually past passive (was replaced, was built, was demolished), though it depends on the dates, with compass directions (in the north, to the east). Describe the current state and you drift from the "change" you're asked about. The map deep dive covers the three map variants, the tense each needs, and a Band 9 model.

7. Combination

Two visuals together, like a line graph and a pie chart. The overview pulls one key point from each and sums them. Watch your time split, and don't write one heavily while the other goes thin. Covering both evenly is the Task Achievement requirement. The combination deep dive covers the combined introduction, the seam between figures, and a mixed-tense Band 9 model.

The type decides the overview

This is the heart of it. Writing an overview at all is required for every type. But what goes in the overview is set by the type.

A time-series line graph gives a trend. A static bar chart gives a size comparison. A process gives the flow of stages. A map gives the direction of change. Get this wrong and you'll write, say, a process as an "upward trend," reporting something the diagram never showed. That isn't vocabulary or grammar, it's Task Achievement: are you reporting what the figure shows, accurately and in full? Spotting the type first is the way in.

Tense and passive change with the type

The type sets the tense too. A finished line graph or bar chart is past tense. A process is present simple with passive. A map's changes are past passive. If the figure includes a projection, you need future forms. Grammatical Range and Accuracy is watching here. Miss the tense the figure calls for and you lose on accuracy however fluent the description reads.

General Training is a letter

Everything above is Academic Task 1. General Training Task 1 is a letter, not a chart, and what it asks for is fundamentally different: a tone that fits the reader, all three bullet points covered, and the purpose clear in the first line. The chart overview rules don't apply to a letter. Which version you take is explained in Academic vs General Training.

How to practise

Run type-based practice like this. Look at the figure and decide which of the seven it is. Then write that type's overview (trend, comparison, stages, change) in one or two sentences. Then build the body from the figures that mean something, split into two paragraphs. Use official material like Cambridge IELTS and put every prompt through "spot the type, then overview, then body." Repeat it and no type freezes you on the day.

How this links to Band 7

A Band 7 on Task 1 means securing Task Achievement with a type-correct overview, then bringing the other three axes (Coherence, Lexical Resource, Grammatical Range) up to a 7. Task 1 is a third of the Writing score. The overall Band 7 build is in how to get IELTS Band 7, and the Task 2 version of this, its question types, is in Writing Task 2 topics and the five types.

FAQ

How many Task 1 chart types are there? Academic has seven: line graph, bar chart, pie chart, table, process diagram, map, and combination. General Training Task 1 is a letter instead.

Is a process written differently? Yes. There are no numbers or trends. You write the stages in order, in present simple with the passive. The overview gives the number of stages, the start and end, and whether it's cyclical or linear.

What tense for a map? Mostly past passive (was built, was replaced), since you're describing change, though the dates decide it. Use compass directions, and write the change between the two maps rather than the current state. The map deep dive covers all three variants.

Do I write every number in a table? No. Reading out every cell goes flat. Name the highest, lowest or standout pattern in the overview, and select only meaningful figures in the body. The table deep dive has the full build.

Where does the overview go? Just after the introduction, near the top. Without it, Task Achievement caps at Band 5. More is in reading Task 1 across the four axes.

Do these types apply to General Training? No. GT Task 1 is a letter, so the chart types are Academic only.

The takeaway

Task 1 starts with spotting the chart type. Line graph, bar chart, pie chart, table, process, map, combination. Each changes what the overview captures (trend, comparison, stages, change) and the tense you use. Get the type wrong and you describe something the figure never showed, and Task Achievement drops.

So in your next practice, decide "which type is this?" in a second before you write. Read the type and the overview follows; fix the overview and the body's frame follows. From there it's the right tense and vocabulary for that one figure, sharpened five minutes a day.