Coherence

Coherence is the quality that makes a text make sense as a unified whole. It is a property of the reader's or listener's interpretation — the ability to follow the argument, track topic development, and construct a mental model of what the text is about. Unlike Cohesion, which can be identified in surface features, coherence is a judgment about whether the ideas connect logically.

What Makes a Text Coherent

Topic continuity — each sentence or paragraph should connect to a clear, developing topic. Readers expect a "given-new" pattern: each new sentence starts with something known and adds something new. When this pattern breaks down, readers lose the thread.

Logical ordering — ideas are sequenced in a way that makes sense for the genre and purpose. A chronological recount follows time order. An argument moves from claim to evidence to conclusion. A problem-solution text presents the problem before the solution. Violating expected orders creates confusion.

Relevance — every part of the text contributes to the overall purpose. Tangents, irrelevant details, and unsupported claims all damage coherence. In academic writing, coherence often depends on whether each body paragraph clearly supports the thesis.

Propositional connectivity — the relationships between ideas (cause-effect, contrast, exemplification, elaboration) are clear to the reader, whether or not they are explicitly marked by cohesive devices.

Coherence Without Cohesion

A coherent text does not need explicit linking. Consider:

The bus didn't come. I was late for work.

No conjunction, but the causal relationship is clear from world knowledge. Much natural language — especially spoken language — relies on implicitly understood connections. Over-reliance on explicit connectors ("Therefore," "Moreover," "In addition") can actually reduce readability when the logical relationships are already obvious.

Coherence vs. Cohesion: The Teaching Implication

Many learners (and some teachers) equate coherence with using lots of [[Linking|linking words]]. This produces texts that are superficially cohesive but structurally incoherent — paragraphs that wander, topic sentences that don't match paragraph content, conclusions that introduce new ideas.

Teaching coherence means teaching learners to:

• Plan before writing — outlining is a coherence tool
• Write clear topic sentences — the first sentence of each paragraph should signal what the paragraph is about
• Develop ideas fully — one idea per paragraph, with supporting detail
• Check logical flow — does each paragraph follow naturally from the previous one?
• Read as a reader — can someone unfamiliar with the topic follow the argument?

Coherence in Assessment

IELTS, Cambridge, and most writing assessments evaluate coherence and cohesion together but they are distinct skills. A Band 7 IELTS essay demonstrates "clear progression throughout" with "each paragraph having a clear central topic" — these are coherence criteria. The use of cohesive devices is a separate (though related) dimension. Learners who focus only on memorizing linking phrases without improving their idea organization will plateau.

Coherence connects to Discourse Analysis at the theoretical level — understanding how texts create meaning beyond the sentence — and to Genre at the practical level, since genre conventions provide the structural templates that make coherence achievable.