2.5. Coherence & Cohesion

What Are Coherence and Cohesion?

These two words appear together in the IELTS band descriptors, but they mean different things. Understanding the difference is essential because it changes how you improve each one.

Coherence is the logical flow and organisation of your writing. It's about how you, as a writer, guide the reader through your response. Does your essay make sense as a whole? Does each idea follow naturally from the last? Can the reader follow your argument without getting lost?

Cohesion is the connection between your words, sentences, and paragraphs. It's about the specific words and phrases you use to link ideas together — the glue that holds your writing together at the surface level.

Here's the simplest way to remember the difference:

<!-- [DIAGRAM NEEDED: A winding river flowing smoothly from top to bottom through a landscape, representing coherence — the natural, logical flow of ideas from start to finish. Caption: "Coherence is like a river: your ideas should flow naturally from one to the next."] --> <!-- [DIAGRAM NEEDED: A brick wall with visible mortar between the bricks, representing cohesion — the connecting material that holds individual ideas (bricks) together into a solid structure. Caption: "Cohesion is like mortar: it bonds your individual ideas into a unified whole."] -->

Think of it this way: you can have perfect cohesion (linking words everywhere) but poor coherence (the ideas themselves don't follow a logical order). And you can have strong coherence (a well-structured argument) with minimal cohesion devices — because the logic itself carries the reader forward. The best writing has both.

The 5 Key Components (From the Band Descriptors)

The IELTS marking criteria for Coherence and Cohesion evaluate five specific things:

1. Logical Organisation

Your ideas should be arranged in a way that makes sense. Each paragraph has a clear role, and the order of your paragraphs is logical. For example, you wouldn't present your conclusion before your arguments, and you wouldn't jump between unrelated points within a single paragraph.

2. Clear Progression

Your writing should move forward. Each sentence should build on the previous one, and each paragraph should advance your argument. The reader should never feel like you're going in circles or jumping backwards.

3. Paragraphing

Each paragraph should contain one central idea, and you should use paragraphing to signal shifts in topic or argument. A wall of text with no paragraph breaks will score poorly, even if the ideas themselves are good. Equally, having too many very short paragraphs (1-2 sentences each) signals underdeveloped ideas.

4. Use of Cohesive Devices

This is what most students focus on — linking words like "however," "furthermore," and "for example." They matter, but as you'll see below, using them well means using them sparingly.

5. Referencing and Substitution

This is about avoiding repetition naturally — using pronouns ("they," "it"), demonstratives ("this approach," "such measures"), and substitution ("the former," "the latter") to refer back to ideas without repeating the same words.

Cohesive Devices: The Four Categories

Cohesive devices fall into four main categories. You don't need to memorise every word in each category, but you should be comfortable using at least 2-3 from each.

Tip: "Because" is one of the most useful words in English, and many students underuse it. It directly connects a claim to its reason in a single sentence, which is exactly what the examiner wants to see. Don't avoid it because it seems "too simple."

Why Overusing Linking Words LOWERS Your Score

This is the most important section of this lesson. Most students believe that more linking words = higher score. The opposite is true.

Look at what the band descriptors actually say:

That word "mechanical" at Band 6 is critical. Mechanical means robotic — like every sentence begins with a linking word, like you're following a formula rather than writing naturally.

The British Council explicitly warns:

• Don't overuse linking words
• Don't use them inappropriately
• Don't always use linking words at the beginning of sentences

The Electric Cars Example

Here's what overuse looks like versus natural cohesion:

Overusing linking words (Band 6 — mechanical):

"To begin with, electric cars help reduce global warming. As a result, they produce less CO2. Consequently, less carbon dioxide enters the atmosphere. Therefore, greenhouse gas levels decrease. Furthermore, this leads to lower temperatures."

This paragraph has five linking words and repeats the same idea five times. Every sentence starts with a connector. It reads like a student following a "use linking words" checklist rather than communicating an idea.

Natural cohesion (Band 8-9):

"Electric cars help reduce the impact of global warming because they produce less CO2."

One sentence. One linking word ("because"). The idea is communicated clearly, concisely, and completely. The cohesion attracts no attention — which is exactly what Band 9 requires.

The rule: If removing a linking word doesn't change the meaning or flow of your writing, you probably don't need it. Linking words should serve your ideas, not decorate them.

Joining Supporting Ideas vs Joining Opposing Ideas

When you do use linking words, make sure you're using the right type. The two most common functions are:

Supporting (Adding to a Point)

Use these when your next sentence builds on, extends, or adds to the previous idea:

Opposing (Introducing a Contrast)

Use these when your next sentence presents an alternative, exception, or contradiction:

Common mistake: Using a supporting connector when you need an opposing one (or vice versa). "Exercise is good for health. Furthermore, many people find it boring." — That "furthermore" should be "however" because the second idea contrasts with the first.

Practice Exercise 1: Categorise the Linking Words

Place each word into the correct category: Supporting or Opposing.

1. nevertheless
2. moreover
3. in contrast
4. in addition
5. although
6. besides this
7. while
8. what is more
9. on the other hand
10. also

<details> <summary>Check your answers</summary> </details>

Referencing and Substitution

High-scoring essays avoid clumsy repetition — not by using a thesaurus, but by using referencing and substitution. These are small words that point back to something already mentioned, keeping your writing smooth without repeating the same nouns.

Using Pronouns

The most basic form of referencing — replacing a noun with a pronoun:

"The Palm Islands are the largest artificial islands in the world. They are being developed as major tourist resorts."

"They" clearly refers back to "The Palm Islands." Simple, effective, no repetition.

Using Demonstratives

Demonstratives ("this," "these," "those," "such") point back to a broader idea, not just a single noun. They're especially useful for linking sentences:

• "The government increased taxes on sugary drinks. This approach has been shown to reduce consumption by up to 20%."
• "Schools now teach coding from age six. These measures reflect a shift towards technology-focused education."
• "Companies are offering remote work and flexible hours. Such initiatives help attract younger employees."

Tip: When using "this" or "these," it's often clearer to add a noun after it — "this policy," "this trend," "these changes" — rather than using "this" alone. "This" on its own can be vague. "This policy" is precise.

Using Substitution

Substitution replaces a word or phrase with a shorter alternative to avoid repetition:

• The former / the latter: "Both solar and wind energy are renewable. The former is more widely used in homes, while the latter is common in rural areas."
• Do so: "The government promised to invest in infrastructure, and it is expected to do so within the next five years."
• One / ones: "If students need a computer, the university can lend one for the semester."

Practice Exercise 2: What Does It Refer To?

Read this paragraph, then identify what each bolded reference word refers to:

"The number of people working from home has increased significantly since 2020. They often report higher job satisfaction and better work-life balance. This has led many companies to adopt permanent remote work policies. It is estimated that by 2030, nearly half of all professional jobs will offer some form of flexible working. These changes are likely to reshape urban planning and housing markets in the coming decades."

<details> <summary>Check your answers</summary>

• They = people working from home
• This = the fact that remote workers report higher satisfaction and better work-life balance
• It = impersonal "it" (used in "it is estimated" — a formal structure, not referring back to a specific noun)
• These changes = the shift towards remote and flexible working described in the paragraph

</details>

Practice Exercise 3: Gap-Fill Paragraph

Fill in the blanks with an appropriate linking word or phrase. Each gap requires a different word.

"(1) ............, there are obvious advantages to learning English in an English-speaking country. (2) ............, there are opportunities to practise listening to and speaking in English every day. (3) ............, students can experience the culture first-hand, (4) ............ is a huge advantage when trying to understand a language. (5) ............, if students are taking language lessons at a school, the teachers will be native speakers. (6) ............, not only will students' speaking and listening skills improve, (7) ............ they will also be able to improve their pronunciation and develop their grammar and vocabulary. (8) ............, being in an English-speaking environment forces us to use the language (9) ............ survive. (10) ............ basic need will force even the shyest student to speak English."

<details> <summary>Check your answers</summary>

1. However — signals a contrast with a previous point (likely about disadvantages)
2. Firstly — introduces the first advantage
3. Furthermore — adds another advantage
4. Which — relative pronoun referring back to experiencing the culture first-hand
5. Also — adds yet another point
6. Consequently — shows a result of the previous points
7. But — introduces an additional (slightly contrasting) benefit alongside the first
8. In addition — adds a further point
9. In order to — shows purpose
10. This — refers back to the basic need to use English to survive

</details>

Notice: This paragraph uses ten different cohesive devices — and some of them work better than others. In your own writing, you wouldn't need this density of linking words. This exercise tests your knowledge of the options available to you; in practice, you'd use fewer.

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Key Takeaways

• Coherence is the logical flow and organisation of your ideas — the river. Cohesion is the connecting words and phrases — the mortar. You need both, but coherence matters more.
• The band descriptors assess five things: logical organisation, clear progression, paragraphing, cohesive devices, and referencing/substitution.
• Band 9 cohesion "attracts no attention" — the best linking is invisible. Overusing linking words makes your writing mechanical, which caps you at Band 6.
• Use the right type of connector: supporting connectors (furthermore, moreover, in addition) for building on a point; opposing connectors (however, nevertheless, although) for introducing a contrast.
• Use referencing and substitution (pronouns, demonstratives, "the former/the latter") to avoid repetition naturally — this is a cohesion skill many students neglect.
• When in doubt, use fewer linking words rather than more. A clear "because" in the middle of a sentence is worth more than five connectors at the start of five sentences.