Task 2 · Cross-cutting skill

Explanation and development — the skill, not the paragraph

This does one job: it takes one claim and follows it, instead of stating four claims and following none. Inside every body paragraph, in both tasks. It is the single largest difference between a mid-band response and a strong one, and it is invisible to the writer because four true statements feel richer than one developed argument.

The long versionwhat it is, what it costs, where it stops

4 examplesworked, and the mistakes with their repair

Guided practice3 steps, you write, then you compare

3 exercisesevery wrong option explains itself

Start here · the long version

What explanation and development really asks you to do

Development is following one claim through its consequences, so that a paragraph reasons rather than accumulates.

A list and a chain look the same length

Four sentences stating four things about a topic can all be true, well written and correctly linked, and still show nothing. What they demonstrate is that the writer knows several facts. A chain — because of this, which means that, which in turn produces this — demonstrates that the writer can reason, and reasoning is what the criterion means by development. The two occupy identical space on the page, which is why the weaker one survives rereading: nothing about it looks wrong.

The mechanism is a question you ask after each sentence: so what follows from that? Answering it produces the next sentence. Answering “what else is true about this topic?” instead produces a list, and the difference between the two questions is the whole skill. Writers who list are not being lazy; they are answering the wrong question, and usually the more natural one.

The vocabulary that carries a chain is small and specific: “this stems from”, “which in turn”, “consequently”, “the implication is that”. What kills a chain is the word that adds instead: every “and also” is a place where a consequence could have gone, and a paragraph with two of them has almost certainly stopped developing anything.

Ask “so what follows?”

Not “what else is true?”. The first question produces a chain, the second a list.

One idea, five sentences

Better than five ideas with one sentence each — and the same length.

Three or four links

A chain has a natural end. The fourth link is usually the one you cannot defend.

“And also” is the warning sign

Two in a paragraph and the paragraph is accumulating rather than reasoning.

What it costs you to skip this

This is where a response stalls at mid-band without anything looking wrong. Everything in the paragraph is true, nothing is reasoned, and no amount of vocabulary or grammar work moves the score — because what is missing is not language. It also wastes the words: a paragraph of assertions uses the same space as a developed one and demonstrates less.

Where it stops applying

A chain can be extended too far. Three or four links is the natural length, and the last one is typically the step you cannot support — “which in turn will transform the economy” is where a good paragraph goes to overreach. Development also cannot rescue a topic sentence that names two ideas: the paragraph has been given permission to drift before development begins.

Examples · watch, then the mistakes

The skill working, and the two ways it fails

Worked example · As … which in turn

Investment in public transport eases congestion. As fewer private vehicles compete for road space, journey times fall for everyone, which in turn makes the network more attractive to the drivers who remain.

Why it works: One claim followed for three steps, and no new idea introduced anywhere. Everything after the first sentence is a consequence of it — which is the test.

Worked example · stems from … rather than · therefore

The shortage stems from decades of under-building rather than from recent demand, and it is therefore unlikely to ease without a sustained programme of construction.

Why it works: The cause is named, a rival cause is ruled out, and a consequence is drawn from the diagnosis. Three moves in one sentence, and each one follows from the last.

Public transport is cheap. It is also environmentally friendly. And also it reduces traffic. Many cities have good systems.

Four claims and no development. Every sentence starts a new idea, so none is followed, and two “also”s mark where consequences should have been.

Repaired: Public transport is cheaper per journey, which puts it within reach of households that would otherwise be priced out of commuting altogether.

Cycling improves health, which improves productivity, which grows the economy, which funds better healthcare.

Four links, and the last two are unsupported. A chain has a natural end, and this one passed it two steps ago.

Repaired: Cycling improves health, which reduces the burden of preventable illness on employers.

Now you try · with the scaffolding on

Build it one step at a time

Follow it for three steps, without introducing a second idea.

The material

Your claim: “Free museum entry benefits the visitors who are least likely to return.”

Step 1Ask “so what follows?” once

Not what else is true about museums. What follows from THIS claim? One sentence.

Your version0 words · minimum 10

10 more words before you can compare. Writing it yourself first is the whole exercise.

Step 2Ask it again

Step 3Write the paragraph, and stop at three links

Exercises · production

Now judge it without the scaffolding

Every wrong option is wrong for its own reason, and it says so. Nothing here is scored automatically.

Which sentence develops “remote work reduces commuting costs” rather than listing?

Choose an option first

You have written three links in your chain. What is the risk of adding a fourth?

Choose an option first

Which question produces development?

Choose an option first

Where it is practised

This skill lives in a stage of the essay too

Body paragraphs

Where this skill is built into a paragraph, with the rest of the stage around it.

Thesis and position

It states the answer to the question and keeps that answer visible from the first paragraph to the last.

Topic sentences

It opens a paragraph by naming the one claim that paragraph exists to support.

Examples and evidence

It makes an abstract claim concrete, without pretending to a source you do not have.

Contrast and concession

It admits what is true in the opposing view and then explains why your position survives it.

Sentence types

It varies the shape of your sentences for a reason, instead of writing every sentence the same way.

Critical final review

It checks the four things that can still be fixed, in the order that finds the expensive problems first.