IELTS Writing Task 1: How to Describe a Graph, Chart or Process Step by Step

Task 1 comes before Task 2 in the IELTS Writing paper, but most students prepare for it last — if at all. That’s a mistake: Task 1 is worth the same as Task 2, takes less time to master, and rewards a formula you can learn in an afternoon. Here’s the structure examiners are actually trained to look for.

What Task 1 is really testing

You’ll be given one visual — a line graph, bar chart, pie chart, table, process diagram, or map — and asked to “summarise the information by selecting and reporting the main features, and make comparisons where relevant.” Read that instruction again, because it’s the whole task. You are not asked to explain why the data looks the way it does, and you are not asked for your opinion. You’re asked to select, describe, and compare. Candidates who argue or speculate about causes lose marks for Task Achievement, even when their English is excellent.

You have 20 minutes and need a minimum of 150 words. In practice, aim for 170–190 — enough to cover the data properly without running out of time for Task 2.

The four-paragraph structure that works for almost any chart

Whatever visual you’re given, the same shape holds up:

• Paragraph 1 — Introduction: one sentence, paraphrasing the task.
• Paragraph 2 — Overview: two to three sentences naming the main trends, with no numbers.
• Paragraph 3 — Detail group 1: the first half of the data, with specific figures.
• Paragraph 4 — Detail group 2: the rest of the data, with specific figures and comparisons.

Paragraph 1: paraphrase, don’t copy

Examiners read the same prompt dozens of times a day, so copying it word-for-word is both lazy and penalised. Swap the vocabulary instead:

• Prompt: “The chart shows the number of tourists visiting three countries between 2000 and 2020.”
• Your version: “The bar chart illustrates how many visitors three countries received over a twenty-year period, from 2000 to 2020.”

State what the visual is (chart, graph, table, diagram), what it shows, and the time frame or units, if given.

Paragraph 2: the overview — the paragraph that decides your band

This is the single most important paragraph in Task 1, and the one most self-taught students skip entirely. The overview states the two or three biggest, most obvious patterns in the data — with no numbers at all. Numbers belong in the body paragraphs; the overview is where you step back and say what the data means in general.

For a line graph showing rising and falling trends: “Overall, X increased considerably over the period, while Y experienced a steady decline. Z, by contrast, remained relatively stable throughout.” For a bar chart comparing categories: “Overall, Country A received significantly more visitors than the other two countries, and this gap widened over time.” Band 7 descriptors specifically require “a clear overview” — examiners are trained to check for one, and its absence caps your score regardless of how good the rest of the essay is.

Paragraphs 3 and 4: detail, with figures and comparisons

Split the data into two logical groups — the two highest values, the two trends going up versus the ones going down, the first half of the timeline versus the second — and describe each group with specific numbers, using comparative language: “almost double,” “roughly a quarter of,” “more than three times as many as,” “a slight increase of around 5%.” Don’t try to mention every single data point; select the features that matter and support them with figures.

Language for each chart type

Different visuals need different vocabulary, and having a few ready-made phrases for each saves you from repeating “increase” fifteen times.

• Line graphs (trends over time): rose, climbed, surged, fluctuated, declined, plummeted, levelled off, remained constant.
• Bar charts (comparisons between categories): was considerably higher than, accounted for the largest share, was roughly on a par with.
• Pie charts (proportions): made up just over a third of, represented the smallest proportion, accounted for nearly half.
• Process diagrams: use passive voice and sequencing words — “first, the raw material is heated,” “once this stage is complete,” “finally, the product is packaged.”
• Maps: focus on changes between two points in time — “a new road was constructed,” “the area previously occupied by farmland was converted into housing.”

Mistakes that quietly cap your score

• No overview, or an overview with numbers in it — keep numbers out of paragraph 2.
• Listing every figure instead of selecting the main features — Task 1 rewards selection, not completeness.
• Giving reasons or opinions — “this is probably because of the economic crisis” doesn’t belong here; save analysis for Task 2.
• Under 150 words — you lose marks automatically, even if everything else is well written.
• Present tense for a graph that shows past data — if the chart covers 2000–2020, describe it in the past simple, not the present.

Managing the 20 minutes

A workable split: 2 minutes reading and planning (identify the two groups and the overview before you write a word), 15 minutes writing, 3 minutes checking tense consistency and word count. Planning the overview first, before you write the introduction, stops you from running out of time right when the most important paragraph is due.

Practising it for real

The fastest way to tighten this up isn’t writing twenty more practice essays alone — it’s having someone read your overview paragraph and tell you, in thirty seconds, whether it would actually satisfy an examiner. A tutor who’s seen hundreds of Task 1 answers can spot in one glance the gaps a self-study checklist misses. If you’re working toward a specific band score, a few focused sessions on Task 1 and Task 2 together, booked through Parlazo, usually move the needle faster than another week of solo practice.