Task Achievement vs Coherence and Cohesion in IELTS Writing

Task Achievement and Coherence and Cohesion are two separate IELTS Writing criteria, each worth 25% of the band, and confusing them is a common reason candidates plateau. The simplest distinction: Task Achievement scores what you say — whether you fully answer the question; Coherence and Cohesion scores how you organise and connect it. You can have excellent ideas that score low on Coherence because they're badly arranged, and a beautifully organised essay that scores low on Task Achievement because it dodges the question.

Note: in Task 2 the first criterion is called Task Response; in Task 1 it's Task Achievement. They play the same role.

Task Achievement / Task Response: did you answer it?

This criterion asks whether you addressed the prompt fully and appropriately. For Task 1 (Academic) that means covering the key features of the chart and an accurate overview; for Task 2 it means responding to every part of the question, taking a clear position, and supporting your ideas. The classic failure is partial coverage — describing the topic broadly, missing a sub-question, or in Task 1 listing every data point without an overview. None of that is about linking words; it's about content.

Coherence and Cohesion: is it organised and connected?

This criterion ignores whether your ideas are correct and asks whether a reader can follow them effortlessly. Two parts:

• Coherence — logical organisation: one clear idea per paragraph, sensible progression, a position the reader can track.
• Cohesion — the linking that signals that logic: connectors, referencing (this, such, the latter), and substitution, used accurately and not mechanically.

A well-developed argument with no paragraphing, or with connectors bolted on at random, scores low here regardless of how good the ideas are.

Why candidates confuse them — and why it matters

The two feel related because a clear argument tends to be both well-reasoned and well-organised. But they're marked independently, so diagnosing the right one is what unlocks improvement. If feedback says your ideas are thin or off-topic, that's Task Response — develop and target your content. If it says your essay is hard to follow or jumps around, that's Coherence — fix paragraphing and linking. Treating an organisation problem as an idea problem (or vice versa) is why people study hard and stay at the same band.