IELTS coherence and cohesion: linking words won't reach 7

Picture the desk of someone stuck at Writing 6.5: a list of linking words taped to the wall (moreover, furthermore, consequently, nevertheless), all memorised, all used in every essay. The Coherence and Cohesion score keeps coming back at 6. The feedback never once says "add more connectors."

That gap is the whole problem. At 6.5, the instinct is to reach for one more linking word. But the official Band Descriptors treat over-used, mechanical linking as a Band 6 feature. The connectors you already memorised may be the exact thing holding the score down.

This is a deep dive on one criterion: Coherence and Cohesion (CC). What it measures, why more linkers backfire, and the four things it rewards instead, with examples you can copy.

What coherence and cohesion measure

The two words get treated as one, but they pull in different directions.

Coherence is whether a reader can follow your thinking without backing up. It lives at the macro level: the order of your paragraphs, whether each one builds on the last, whether your position is the same in the conclusion as it was in the introduction.

Cohesion is the surface machinery that ties sentences together: linking words, pronouns, and the way you refer back to ideas you already mentioned. It lives at the micro level, sentence to sentence, clause to clause.

You can have one without the other. An essay can be stuffed with "however" and "therefore" (cohesive devices everywhere) and still be incoherent, because the ideas underneath don't progress. That combination is common at Band 6, and it's why adding connectors rarely moves the score.

CC is one of four equally weighted criteria in Writing, alongside Task Response, Lexical Resource, and Grammatical Range & Accuracy. So it's worth a flat 25% of each Writing task's score. The same averaging that decides your overall score repeats one level down inside Writing.

Here's what the public Band Descriptors say at the boundary you care about. At Band 6, cohesive devices are used "to some good effect," but cohesion within and between sentences "may be faulty or mechanical due to misuse, overuse or omission." At Band 7, there's "a clear progression throughout the response," and "a range of cohesive devices including reference and substitution is used flexibly." Paragraph focus shows up too, as a Band 6 warning: "the central topic may not always be clear." Read those side by side and the lever is obvious: 7 is about logic and restraint, not connector volume.

The linking-word trap

Put the two descriptors next to each other and a pattern jumps out. The thing that defines Band 6 cohesion, mechanical and over-used linking, is the thing most 6.5 candidates are doing more of to try to escape 6.5.

Look at what over-use reads like:

Band 6, linker-heavy: "Firstly, cars cause pollution. Moreover, they create traffic. Furthermore, they are expensive. In addition, public transport is cheaper. Therefore, governments should invest in it."

Five sentences, four connectors. Each one announces a relationship the reader could already see. The links are technically "correct," but they're doing the job a paragraph structure should do, and the examiner reads it as memorised scaffolding.

Now the same ideas with the linkers thinned out and the cohesion carried by structure instead:

Band 7, restrained: "Cars pollute the air and clog city roads, and running one is expensive. Public transport avoids all three problems at a lower cost, which is why it deserves government investment."

Fewer connectors, tighter logic. The second version uses "all three problems" to point back at the list. That's referencing, and it does more for cohesion than any "furthermore" can.

A rough self-check: count your transition words. If you average more than one per two sentences, you're probably signalling Band 6, not climbing toward 7. The fix isn't a better word. It's fewer of them, placed only where the logic turns.

The four things CC actually rewards

Strip away the linking-word obsession and the criterion comes down to four levers. Most learners pour effort into the last one and ignore the first three. That's backwards, because the first three carry more weight.

Paragraphing: one central topic per paragraph

The descriptor frames this from the Band 6 side: paragraphing "may not always be logical and/or the central topic may not always be clear." Flip that warning and you have the Band 7 habit, one clear central topic per paragraph. That's the single most testable thing in CC, and the easiest to get wrong. The common mistake is cramming two ideas into one body paragraph (a cause and a solution, or an advantage and a counterpoint), so neither gets developed and the paragraph has no centre.

The test takes ten seconds: read only your topic sentence, then ask whether every other sentence in that paragraph serves it. If a sentence belongs to a different idea, it belongs in a different paragraph.

Progression: the reader never has to double back

Coherence is destroyed by drift. Your introduction commits to a position, paragraph two supports it, and then paragraph three quietly argues the other way before the conclusion hedges. Each piece might be fine in isolation; together they don't progress, they wander.

Strong progression means each paragraph follows from the one before, and the position you state at the end is the one you opened with. Before you write a single body sentence, decide your stance and keep it identical from introduction to conclusion.

Referencing and substitution: the cohesion nobody teaches

This is the underrated lever, and the descriptors name it directly: the Band 7 line counts "reference and substitution" among the cohesive devices it wants used flexibly. It means pointing back at earlier ideas instead of repeating the noun every time. You do it with pronouns (it, they, this), with demonstratives plus a summary noun (this trend, such measures, these findings), and with synonyms.

Repetitive: "The government should fund renewable energy. Renewable energy reduces emissions, and renewable energy creates jobs."

Cohesive: "The government should fund renewable energy. It reduces emissions, and the sector creates jobs."

"It" and "the sector" both point back at "renewable energy" without repeating it. That chain of reference is invisible cohesion. The reader feels the flow and never notices the mechanism. Build two or three of these chains in an essay and your cohesion stops depending on connectors at all.

Cohesive devices: appropriate, not maximal

Linkers still matter. The Band 7 wording is "a range of cohesive devices including reference and substitution is used flexibly," with the warning of "some inaccuracies or some over/under use." Two things hide in that line. Range means not running "First, Second, Finally" down the page; reach for precise ones, "Conversely" for a genuine contrast, "To illustrate" before an example. Flexibly means signalling only a relationship that exists, instead of stamping a connector on every sentence. A "therefore" in front of a sentence that isn't a conclusion does more damage than no linker at all.

Common coherence mistakes that quietly cost 0.5

A few patterns show up again and again in essays scoring 6 on CC. The floating pronoun: a "this" or "it" with no clear noun behind it, so the reader has to guess what you mean. The two-topic paragraph, already covered, where the centre disappears. The template phrase that doesn't fit, like "It is widely acknowledged that…" bolted onto a claim nobody widely acknowledges. And the linker pile-up, where every sentence opens with a transition until the structure reads like a checklist.

None of these are vocabulary or grammar problems. That's the point. You can fix every one of them without learning a single new word, which is why CC is often the cheapest half-band on the page.

Fix coherence in five minutes a day

A full practice essay spreads your attention across all four criteria, so CC rarely gets isolated practice. You write a whole essay, get "Band 6, reasonably organised," and still don't know which of the four levers above to pull. Targeted drills fix that:

• Topic-sentence sprint. Take five different Task 2 prompts and write only the topic sentence for each body paragraph. No bodies, no conclusions. You're training paragraph focus and nothing else.
• The linker diet. Take a paragraph you already wrote, delete every connector, then add back only the ones the logic needs. Most paragraphs survive on half of what they started with.
• The referencing rewrite. Find a paragraph where you repeated a noun three times. Replace two of them with a pronoun or a "this + summary noun." Read it aloud and feel the flow tighten.

Five minutes, one lever, every day. That's the idea behind IELTS Drills: feedback is tagged to a single Band Descriptor, so when your weak criterion is CC, you drill paragraphing and referencing on their own instead of writing another full essay and hoping.

If you're not certain CC is the criterion holding you at 6.5 (it might be Task Response or grammar instead), the four-axis self-diagnosis here walks through all four so you target the right one.

Frequently asked questions

Is coherence and cohesion the same as linking words? No. Linking words are one small part of cohesion. Coherence is the bigger logic (paragraph order and progression), and cohesion also includes referencing and substitution. Linkers are the most visible piece but rarely the deciding one.

How many linking words should I use? There's no target number. The descriptor rewards appropriate use, not quantity, and explicitly flags over-use as a Band 6 feature. If more than half your sentences open with a connector, cut some.

Does coherence and cohesion apply to Task 1? Yes. It's a criterion in both tasks. In Academic Task 1 it's mostly about sequencing the data logically and grouping figures into clear paragraphs rather than listing every number in order.

Is CC the same in Speaking? Not quite. Speaking's first criterion is Fluency and Coherence, so coherence carries over, but cohesion is judged differently: natural connected speech rather than written paragraphing.

How much is coherence and cohesion worth? A flat 25% of each Writing task's score. It's one of four equally weighted criteria, and each task score is their average before it ever feeds into your overall band, where Task 2 counts for twice as much as Task 1.

The bottom line

More linking words is the wrong instinct at 6.5, because over-used connectors are what Band 6 looks like. Coherence and cohesion reward something quieter: one clear topic per paragraph, a position that never drifts, and referencing that lets you stop repeating yourself. Get those three right and you'll need fewer linkers, not more.

The test an examiner is applying is simple: can they follow you without ever reading a sentence twice? Write for that, and CC stops being the criterion that keeps costing you 0.5. With IELTS Drills, that's the kind of feedback you get back: tagged to CC, five minutes a day.