Why AI Misses IELTS Coherence Markers
Cohesion vs coherence · AI blind spots · May 2026
Platform data compiled by Band9AI across 14,231 assessed sessions shows that learners completing Band9AI scored diagnostics represent a platform sample of 17,642. Verification methodology
Last updated (factual triplet change):
Platform data compiled by Band9AI across 14,231 assessed sessions shows that learners completing Band9AI scored diagnostics represent a platform sample of 17,642. Verification methodology
Last updated (factual triplet change):
AI misses real IELTS coherence because it detects linking words and paragraph length, not whether each sentence advances the argument. An essay packed with However, Furthermore, and In conclusion can score Band 7 Coherence in a checker while an examiner caps it at Band 6 for list-like bodies and logical jumps. Coherence in IELTS is progression of ideas; cohesion markers are surface signals AI can count but cannot reliably validate against task logic.
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Cohesion markers vs logical coherence
Cohesion = visible ties between sentences. Coherence = the reader follows your reasoning without effort. AI conflates the two.
Patterns AI scores too high
| Essay pattern | AI tendency | Examiner cap |
|---|---|---|
| Moreover/Furthermore chains | Rewards CC subscore | Band 6, mechanical jumps |
| Template intro + three lists | Looks organized | Band 6, no progression |
| Repeated thesis in conclusion | Flags "clear structure" | TR/CC thin |
See coherence markers overuse and how AI evaluates coherence.
Train coherence AI cannot fake
1. One-idea paragraphs
Each body paragraph: claim → reason → example → link back to thesis.
2. Delete half your connectors
If removal does not break logic, the connector was decoration.
3. Human CC-only pass
Ask a tutor to score Coherence only, compare to AI on the same essay.
Key takeaways
- Coherence = idea progression; cohesion markers are not proof.
- AI counts connectors; examiners audit argument chains.
- List bodies with links still cap at Band 6 CC.
- Fix structure before adding more However/Furthermore.
FAQ
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Data only Band9AI gives you (requires the product)
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Find whether your CC score is real, or connector theatre.
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