IELTS Band Descriptors Explained: What Examiners Want

IELTS band descriptors are the official criteria examiners use to score Writing and Speaking, and most candidates have never actually read them — they prepare based on general advice instead of the specific standard they're being measured against. Understanding what each criterion genuinely rewards is one of the fastest ways to close the gap to your target band, because it tells you exactly what to practise instead of guessing.

Both Writing and Speaking are scored against four criteria, each worth 25% of that skill's band score. The criteria are similar in spirit across both skills but named slightly differently, and the resulting four scores are averaged (and adjusted according to specific rounding rules) into the skill's overall band.

Writing: The Four Criteria

Task Achievement (Task 1) / Task Response (Task 2)

This measures whether you've actually answered the question asked, in the way it was asked. For Task 1, this means accurately summarizing and comparing key data or process stages, not describing every number in order. For Task 2, it means addressing every part of the prompt (a two-part question needs both parts answered), taking a clear position where one is required, and supporting it with relevant, developed ideas rather than a list of disconnected points.

A common Band 6 ceiling here is partial task fulfilment: writing well but only addressing one part of a multi-part question, or drifting from the specific question asked into a more general, memorized essay on the topic.

Coherence and Cohesion

This measures how logically your ideas are organized and how smoothly they connect — through paragraphing, topic sentences, and linking words used naturally rather than mechanically. A Band 7+ essay has one central idea per paragraph, a clear introduction and conclusion, and transitions that feel like genuine logical connections rather than a checklist of linking phrases ("Firstly... Secondly... In conclusion...") inserted without real purpose.

Overusing linking words is a specific, common trap: mechanically inserting "moreover," "furthermore," and "in addition" throughout an essay, regardless of whether a genuine logical connection exists, actually lowers this score rather than raising it.

Lexical Resource

This measures the range, accuracy, and appropriateness of your vocabulary — not how impressive or rare it sounds. Band 7+ requires vocabulary that's precise for the specific meaning intended, used with only occasional inaccuracy, including the ability to paraphrase the question's own wording rather than repeating it. Misused "advanced" vocabulary scores worse than simpler, accurately used words, because accuracy matters more than sophistication. Our 100 IELTS vocabulary words guide organizes useful words by exactly this kind of precise function.

Grammatical Range and Accuracy

This measures both the variety of sentence structures you use (simple, compound, and complex sentences, including a range of clause types) and how accurately you use them. Band 7+ requires frequent use of complex structures with good control, though occasional errors are still acceptable at this level — perfection isn't required, but a narrow range of only simple sentences caps the score regardless of how accurate they are.

Speaking: The Four Criteria

Fluency and Coherence

This measures how naturally and continuously you speak, including your ability to develop ideas logically and use a range of connectives and discourse markers appropriately. Frequent hesitation, self-correction, or reliance on repeated fillers ("um," "like") signal a lack of fluency, even if your grammar and vocabulary are strong elsewhere. Answers that are too short — a single sentence to a question that invites elaboration — also cap this score, since the examiner has little language to assess.

Lexical Resource

As in Writing, this rewards precise, flexible vocabulary use, including idiomatic language and less common vocabulary used naturally, appropriate to the topic. In Speaking specifically, it also rewards effective paraphrasing when you don't know or can't recall a specific word — showing you can communicate the same idea a different way, rather than stopping.

Grammatical Range and Accuracy

Identical in spirit to the Writing criterion: a mix of simple and complex sentence structures, used with reasonable accuracy. In Speaking, occasional slips are entirely normal even at Band 7 to 8, since spoken language is produced in real time without editing — the criterion rewards range and general accuracy, not flawless grammar.

Pronunciation

This is unique to Speaking, and it measures clarity and the effective use of stress, rhythm, and intonation to convey meaning — not how close your accent sounds to a native speaker's. A strong, clearly identifiable non-native accent can still score highly if it doesn't strain the listener's understanding. What actually costs marks is unclear individual sounds, flat or unnatural stress patterns that make meaning hard to follow, or mispronunciations that genuinely obscure a word's meaning.

How Whole and Half Bands Actually Work

Within each criterion, examiners choose the band descriptor that best matches a candidate's performance — but real performance rarely fits one description perfectly. A response might show Band 7 vocabulary but only Band 6 grammatical range, in which case the examiner uses the descriptors to judge which whole or half band overall best reflects the balance of strengths and weaknesses across that criterion. This is why two essays that both "feel" strong can still score differently: one may show more consistent strength across all four criteria, while the other has one standout criterion dragging down an otherwise weaker average.

What If My Scores Are Uneven Across Skills?

It's extremely common, and not a sign that anything has gone wrong. Very few candidates score identically across Listening, Reading, Writing, and Speaking, since they draw on genuinely different underlying skills — Listening and Reading are closer to pattern-recognition and comprehension speed, while Writing and Speaking depend more on active production and real-time judgment. If your scores are uneven, the practical takeaway is to weight your study time toward your weakest skill specifically, rather than assuming a strategy that worked for one skill will automatically transfer to another.

How to Use This to Actually Improve

Reading the descriptors is useful, but the real value comes from using them as a checklist when you review your own practice. After writing a Task 2 essay or recording a Speaking practice answer, go through all four criteria for that skill and ask specifically: did I address every part of the question? Is my paragraphing logical? Is my vocabulary precise? Did I vary my sentence structures? Generic feedback like "this is pretty good" doesn't move your score — feedback mapped against the actual criteria does.

Practise Writing against these exact standards with our Essay Idea Bank and Language Toolkit, and rehearse Speaking fluency daily using our grammar masterclass's built-in speaking practice questions.

For the official published band descriptors, see the British Council and Cambridge English.