What IELTS Actually Measures: The Four Marking Criteria Explained
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Most students preparing for IELTS spend months building vocabulary, practising grammar, and working through past papers. Far fewer read the marking criteria before they start. That distinction matters.
IELTS assesses four skills: Listening, Reading, Writing, and Speaking. Each is marked against detailed band descriptors that are publicly available on the IELTS website. The descriptors describe, in precise terms, what a Band 5 response looks like, what a Band 7 looks like, and what distinguishes one from the other. They are the closest thing to a map of the exam. Most students navigate without them.
The Writing criteria
Writing is assessed across two tasks. Task 1 asks you to describe visual information objectively and accurately. Task 2 is an academic essay. Both are marked against four criteria: Task Achievement or Task Response, Coherence and Cohesion, Lexical Resource, and Grammatical Range and Accuracy.
Task Achievement or Response assesses whether you addressed the task correctly and completely. For Task 2, this means presenting a clear position, developing it fully, and supporting it with relevant ideas rather than general statements.
Coherence and Cohesion assesses how logically information flows both within and between paragraphs. The connections should feel natural, not mechanical.
Lexical Resource assesses vocabulary range and precision. This includes the ability to paraphrase and to select vocabulary that is appropriate for academic register. Repeating the same words, or using informal vocabulary, reduces the score.
Grammatical Range and Accuracy assesses the variety of sentence structures used and the accuracy with which they are deployed. A range of complex structures with few errors is the standard for Band 7.
The Speaking criteria
Speaking is assessed across four criteria: Fluency and Coherence, Lexical Resource, Grammatical Range and Accuracy, and Pronunciation.
Fluency and Coherence assesses whether you can speak at length without excessive hesitation and whether what you say follows a logical development. Long pauses, repetition, and self-correction all affect the score.
Lexical Resource in Speaking assesses vocabulary range and the ability to use less common words appropriately. The examiner is listening for evidence that you can express ideas with precision.
Pronunciation assesses clarity and intelligibility across the full response, including use of features like stress and intonation. Band 7 does not require a British or American accent. It requires speech that is clear and natural without requiring effort from the listener.
The Listening and Reading criteria
Listening and Reading are not assessed against qualitative criteria in the same way. Each question has a single correct answer, and the band score is determined by the number of correct answers. Band 7 in Listening requires approximately 30 correct answers out of 40. Band 7 in Reading requires approximately 30 correct answers in Academic or 34 in General Training.
Why reading the criteria changes your preparation
A student who understands what Coherence and Cohesion actually assesses will approach paragraph structure differently in Writing Task 2. A student who understands what Fluency and Coherence assesses in Speaking will practise differently from one who simply practises speaking.
The criteria describe specific behaviours that the examiner is trained to assess. Understanding them before you start preparing means you know what to build. Most students who improve their band score meaningfully in a short time have done this work early. The ones who don't tend to practise hard in directions the examiner isn't measuring.
For more detailed information on the IELTS marking criteria, visit these websites
