Understanding IELTS Writing Assessment Criteria

Welcome back. In the previous lesson, you established a practical Task 2 routine: protect time for planning, draft each required paragraph, and reserve the final minutes for checking. That process becomes much more useful once you know what you are checking for.

IELTS Task 2 is assessed through four criteria: Task Response, Coherence and Cohesion, Lexical Resource, and Grammatical Range and Accuracy. They are not four separate stages of writing. They are four lenses through which an examiner reads the same essay. By the end of this lesson, you should be able to explain what each lens assesses and distinguish common weaknesses that belong primarily to one criterion rather than another.

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Four lenses on one essay

Imagine an essay that answers the question clearly but is difficult to follow because its ideas are arranged randomly. Its Task Response may be stronger than its Coherence and Cohesion. Another essay may be well organised and easy to follow, yet use inaccurate vocabulary or contain frequent sentence errors. Strong organisation cannot compensate fully for language problems, and sophisticated vocabulary cannot compensate for failing to answer the question.

The four criteria can be summarised like this:

Criterion	Central question for the examiner
Task Response (TR)	Does the essay answer the task fully, relevantly, and with developed ideas?
Coherence and Cohesion (CC)	Is the essay logically organised, and are its ideas clearly connected?
Lexical Resource (LR)	Is the vocabulary sufficiently varied, precise, appropriate, and accurate?
Grammatical Range and Accuracy (GRA)	Does the writer use an appropriate range of sentence structures accurately, including punctuation?

These labels are useful because they tell you where to focus when revising. If an idea does not answer a required part of the prompt, adding a connector such as moreover will not solve the problem. That is primarily a Task Response issue. If the essay repeatedly uses environmental problems when a pronoun or a suitable alternative would be clearer, the problem is mainly cohesion, although vocabulary choices may also be involved.

Before examining the criteria individually, read the official overview. It gives the precise language used by IELTS and makes clear that assessment concerns communication, not the performance of memorised “advanced” phrases.

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Task Response: answering the actual task

Task Response is about the content and purpose of your essay. Examiners consider whether you have responded fully to the prompt, selected relevant ideas, developed those ideas, and made your position clear where the task requires one.

A Task 2 prompt can include more than one demand. For example:

Some people use social media as their main source of news.
Why has this become so common, and is this a positive or negative development?

This prompt requires two things:

1. An explanation of why social media has become a common news source.
2. A judgement about whether this development is positive or negative.

An essay that discusses only the advantages of social media but never explains why people use it has not fully addressed the task. The language may be accurate and the paragraphs may look well organised, but the response remains incomplete.

What Task Response assesses

Task Response includes the following decisions:

• Coverage: Have you addressed every required part of the question?
• Relevance: Do your main ideas answer the prompt, rather than merely discuss the general topic?
• Position: Is your opinion, judgement, or central answer clear and consistent?
• Development: Do you explain and support main ideas, rather than state them as unsupported claims?
• Conclusion: Does the ending follow logically from the position and reasoning already established?
• Format: Have you written a continuous essay rather than notes, headings, or bullet points?

Consider the difference between these two body-paragraph openings for a question about restricting phones in schools:

A. Mobile phones are popular among young people.

B. Restricting mobile-phone use during lessons can improve students’ concentration.

Sentence A may be true, but it does not yet answer a question about whether restrictions are beneficial. Sentence B has a clear connection to that task. It still needs explanation, but it begins with a relevant claim.

Development means explaining the claim

A developed idea does not require specialist knowledge or research. It requires a logical explanation:

Restricting mobile-phone use during lessons can improve students’ concentration. When devices are readily available, students may check messages or social-media notifications instead of following the teacher’s explanation. They can therefore miss key instructions and need additional support later in the lesson.

The writer has moved beyond the claim by explaining the mechanism: device access creates distraction, distraction causes missed information, and missed information affects learning. This is what IELTS means when it refers to ideas being extended and supported.

A useful diagnostic question is:

If I remove the first sentence of this paragraph, do the remaining sentences explain it, or do they simply repeat it?

If the paragraph only repeats the idea in slightly different words, it is underdeveloped.

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Coherence and Cohesion: making the reader’s route clear

The words in this criterion are related but not identical.

• Coherence concerns the logical organisation of ideas.
• Cohesion concerns the language tools that show relationships between ideas and sentences.

A coherent essay has a visible route. The introduction establishes the answer; each body paragraph has a distinct focus; ideas within each paragraph progress logically; the conclusion closes the response. The reader should not need to guess why one point follows another.

Cohesion helps the reader travel along that route. It includes:

• logical connectors such as however, because, therefore, and although;
• reference words such as this policy, these measures, it, and they;
• substitution, which avoids needless repetition;
• purposeful paragraphing.

Coherence: the logic of organisation

Compare these two sequences.

Less coherent:

Schools should restrict phones. Students may use phones for homework. Teachers need to explain difficult topics. Mobile phones can distract learners.

The sentences are individually understandable, but the order is weak. The paragraph begins with a claim, changes to a possible counterpoint, moves to teachers’ work, and only then returns to distraction. The reader must build the logic independently.

More coherent:

Schools should restrict mobile-phone use during lessons because unrestricted access can distract learners. Students who check notifications may miss explanations or instructions from their teachers. Consequently, they may understand less of the lesson and require further assistance afterwards.

This paragraph has a controlling idea followed by explanation and consequence. Its logic is visible even before individual connectors are examined.

Cohesion: show genuine relationships

Cohesive devices are valuable only when they express a real relationship. Do not insert them mechanically at the beginning of every sentence.

For example:

Faulty: Many students use phones for research. Therefore, schools should ban all devices.

The word therefore suggests that the first statement proves the second. It does not. The relationship is unclear.

Clearer: Although mobile phones can be used for research, unrestricted access during lessons may encourage students to check unrelated content.

Here, although accurately signals a concession: phones have one possible benefit, but the writer is presenting a limitation.

A common misconception is that a high score for Coherence and Cohesion requires many linking words. It does not. Excessive patterns such as Firstly, Secondly, Moreover, Furthermore, and Finally can make writing sound mechanical, especially when the relationships are obvious or inaccurately labelled.

Watch the official summary of the four criteria before focusing on cohesion in more detail.

The next clip gives useful examples of cohesion problems. Its most useful message is not “use fewer connectors” as a fixed rule; it is “make every connector and reference word serve a clear purpose.”

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Lexical Resource: choosing words that do the job

Lexical Resource is the criterion for vocabulary. It does not mean “using the most difficult words you know.” An examiner considers whether your vocabulary is broad enough for the topic and whether the words you choose are accurate, precise, appropriately formal, and naturally combined.

For Task 2, vocabulary should help you express distinctions. Compare these claims:

General: Social media has many bad things.

More precise: Social-media platforms can expose users to misinformation and encourage compulsive news checking.

The second version is not automatically better because it is longer. It is better because misinformation identifies a particular problem and compulsive news checking identifies a particular behaviour. The vocabulary makes the reasoning more precise.

What Lexical Resource assesses

Feature	What it means in practice
Range	Having enough vocabulary to discuss the topic without relying on the same basic words repeatedly.
Appropriacy	Choosing words that suit a formal or semi-formal essay and the specific topic.
Precision	Selecting the word that expresses the intended meaning exactly.
Collocation	Combining words naturally, such as pose a risk, reduce congestion, or address a problem.
Word formation and spelling	Using correct forms, such as benefit, beneficial, and beneficially, and spelling key words accurately.

Range matters, but mechanical synonym replacement can damage accuracy. For instance, children, young people, students, and minors are not always interchangeable. A student is a person in education; a minor is a legal category. Choose alternatives only when their meaning fits.

Likewise, some repetition is useful. If your paragraph is about public transport, repeating that precise key term once or twice may be clearer than forcing an unnatural substitute. Cohesion can reduce unnecessary repetition through references such as this system or such services, but clarity remains the priority.

A strong vocabulary revision asks:

• Is this word accurate for my intended meaning?
• Is it suitable for an academic or semi-formal essay?
• Does it form a natural phrase with the surrounding words?
• Is a simpler word actually clearer and safer?

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Grammatical Range and Accuracy: control, not complexity for its own sake

Grammatical Range and Accuracy concerns sentence-level control. It has two linked parts:

1. Range: Can you use a suitable mix of sentence structures?
2. Accuracy: Can you use those structures with enough control that the reader understands your meaning easily?

Task 2 essays should not contain only short, simple sentences:

Phone use distracts students. Teachers dislike it. Schools should ban it.

However, essays should also not turn every sentence into a long, risky structure. Effective writing combines controlled sentence types.

Sentence form	Example	Main function
Simple	Many students check notifications during lessons.	State a point directly.
Compound	Students may receive useful messages, but they can also be distracted by them.	Balance closely related ideas.
Complex	Because students may check messages during lessons, they can miss important instructions.	Express cause, contrast, condition, or concession precisely.

Complex sentences can use subordination, relative clauses, passive structures, modal verbs, comparative forms, or carefully built noun phrases. But “more complex” is not always better. A clear simple sentence can be highly effective, while an inaccurate complex sentence may make the reader work too hard.

Compare:

Uncontrolled: Although students can use phones for research, but they are distracting.

Controlled: Although students can use phones for research, they can also be distracting.

The first sentence incorrectly combines two contrast structures, although and but. The second uses one complete structure accurately.

Punctuation also belongs to this criterion. A missing full stop, an incorrect comma between two complete sentences, or unclear punctuation around a dependent clause can make relationships difficult to follow. In later lessons, you will work directly on building controlled complex sentences. For now, remember the core principle: choose a structure you can manage accurately.

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One paragraph, four criteria

The criteria overlap because they describe different aspects of the same writing. Read this short paragraph:

In my view, schools should limit mobile-phone use during lessons. This policy can reduce distraction because students are less likely to check messages while teachers are explaining new material. As a result, learners can concentrate more fully and retain important information.

Here is how an examiner might notice evidence for each criterion:

Feature in the paragraph	Primary criterion	Why
The writer gives a clear answer: schools should limit phone use.	Task Response	The position directly addresses the issue.
The claim is explained through distraction, missed explanations, and reduced learning.	Task Response	The main idea is extended rather than merely asserted.
The paragraph moves from claim to cause to consequence.	Coherence and Cohesion	The information is sequenced logically.
This policy and As a result show relationships without repeating mobile-phone restrictions.	Coherence and Cohesion	Reference and linking make connections clear.
Limit mobile-phone use, reduce distraction, and retain information are precise, natural expressions.	Lexical Resource	The vocabulary is appropriate and collocates naturally.
Because students are less likely... is a controlled complex sentence.	Grammatical Range and Accuracy	The grammar expresses a causal relationship accurately.

The same sentence can contribute evidence to more than one criterion. For instance, a clear cause-and-effect sentence improves logical development, but its accurate subordinate clause also contributes to grammatical control. When diagnosing a weakness, identify its primary effect first.

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A practical diagnostic routine

When reading a short Task 2 response, use these four questions in order:

1. Task Response: What exactly is the writer’s answer, and has every part of the prompt been addressed?
2. Coherence and Cohesion: Can I follow the argument from paragraph to paragraph and sentence to sentence without guessing?
3. Lexical Resource: Are the words sufficiently precise, appropriate, and naturally combined for this topic?
4. Grammatical Range and Accuracy: Is there a workable variety of sentence structures, and are grammar and punctuation controlled?

This routine prevents a common unproductive habit: circling every grammar error while ignoring that the response has not answered the question. In IELTS, content, organisation, vocabulary, and grammar all matter. Revision is most effective when you identify the problem accurately before trying to repair it.

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Homework: build an assessment-criteria notebook page

Do not write a full essay.

Create one page divided into four sections labelled TR, CC, LR, and GRA.

1. In each section, write a one-sentence definition of the criterion in your own words.
2. Add two observable features for each criterion. For example, under Task Response, you might note “answers all parts of the prompt” and “develops main ideas with explanation.”
3. Use the paragraph below to underline or label one feature of each criterion:

Public libraries should receive government funding because they provide free access to information and study space. This support is particularly valuable for people who cannot afford reliable internet access or a quiet place to work. Consequently, libraries can reduce educational inequality within local communities.

4. Finally, write one improvement priority for the paragraph. It may concern one criterion only, but explain why it belongs mainly to that criterion.

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The four criteria assess distinct but connected aspects of effective writing. Task Response is about answering and developing the task; Coherence and Cohesion is about logical organisation and clear connections; Lexical Resource is about accurate, appropriate, and precise vocabulary; and Grammatical Range and Accuracy is about varied, controlled sentence structures and punctuation.

Next, you will apply this framework by classifying features in short writing samples. The aim will not yet be to award full band scores, but to recognise the evidence that an examiner would notice under each criterion.