Choosing Evidence Strategically: Study Guide (English Language 2.4)

Evidence is chosen, not found

In Topic 1.5 you learned what kinds of evidence exist. This topic asks a sharper question: why did the writer choose this piece of evidence and not another? Any subject offers more facts, stories and quotations than a writer could possibly use. The ones that appear on the page are a selection, and every selection is a rhetorical choice. The course framework says that writers use evidence strategically and purposefully to illustrate, clarify, set a mood, exemplify, associate, or amplify a point, and that strategically selected evidence strengthens the validity and reasoning of an argument, relates to an audience’s emotions and values, and increases a writer’s credibility.

For a reader, the skill is to explain what a piece of evidence is doing. For a writer, the skill is to choose evidence by asking what job you need done.

Six jobs evidence can do

Job	What it means	Example (written by Marlbridge)
Illustrate	Make a general point visible with a concrete picture.	“By nine each morning the bus shelter is full of people who have missed the 8.40.”
Clarify	Make an unfamiliar or complex idea easier to understand.	“Compound interest is like a snowball rolling downhill: it gathers more as it grows.”
Set a mood	Create an atmosphere that prepares the audience to feel a certain way.	“On a grey Sunday the high street has the hush of a waiting room.”
Exemplify	Give a representative instance of a category or claim.	“Take the Corner Café, which closed last month after thirty years.”
Associate	Link the writer’s idea to something the audience already respects, loves or fears.	Comparing the library’s closure with the closing of a school or a church.
Amplify	Increase the force or scale of a point.	“Not one shop but twelve; not a month but six years.”

One piece of evidence can do more than one job. The skill is to say which job matters most in context.

Strategy: match the evidence to the argument, the audience and the purpose

A writer making a strategic choice usually weighs four things.

1. The claim. Does the evidence bear directly on what is being asserted? (Validity.)
2. The audience. Will these readers find this convincing, and does it connect with what they believe and value? (Emotions and values.)
3. The writer’s credibility. Does the choice make the writer seem knowledgeable, fair and trustworthy? (Credibility.)
4. The purpose. Is the aim to inform, persuade, honour, warn, or move people to act? (A writer who wants action may choose a vivid example; one who wants a council to approve a budget may choose figures.)

Examples of matched choices

Audience and purpose	A likely strategic choice	Why
Sceptical budget committee; persuade them to fund a repair.	A costed comparison with the price of delay.	Committees need figures to justify decisions (validity, credibility).
Neighbours at a meeting; persuade them to sign a petition.	A named local resident’s story.	Community listeners respond to people they know (emotions and values).
Specialist readers; persuade them a method is flawed.	A controlled study and a named authority.	Experts trust methods and citations (credibility).
Young readers; explain a complex idea.	A vivid analogy.	Clarifies without jargon.

Credibility of the source

Evidence is only as strong as its source. A writer who selects evidence strategically also chooses reliable, relevant and recent sources, and explains them where needed. “A study by the university’s transport department found…” carries more weight than “I read somewhere that…”. Credibility is not only the source’s fame. Ask whether the source is qualified to speak on this question, independent of those who would gain from the conclusion, and current.

Strategic selection versus cherry-picking

Choosing evidence to support a claim is natural. Choosing only the evidence that suits, and hiding what does not, can mislead. A writer who is fair acknowledges evidence that cuts the other way and explains why it does not change the conclusion. That fairness builds credibility. On the exam, you may be asked whether a writer’s selection is representative, or what effect an omission might have.

A public-domain example: Lincoln’s “house divided” (1858)

When Abraham Lincoln accepted the Illinois Republican nomination for the Senate in Springfield on 16 June 1858, he said: “A house divided against itself cannot stand. I believe this government cannot endure, permanently half slave and half free.”

The first sentence is evidence by analogy. The image of a divided house is familiar, concrete and widely understood. It does several jobs:

• Clarify: it turns an abstract political problem, a nation divided on slavery, into a simple picture of a house in which people want to live.
• Associate: the phrase was drawn from the Gospels (Mark 3:25 and Matthew 12:25), so it carried the authority of a text his audience knew well.
• Amplify: the phrase “cannot stand” suggests total collapse, raising the stakes of the claim.

Notice that the analogy comes first and the explicit claim follows. The familiar image prepares the audience to accept the statement that the Union cannot endure half slave and half free.

Worked example 1: choosing evidence for an audience and purpose

Task. A student wants to persuade the school governors to keep the school’s minibus service. He has four pieces of evidence (the figures are invented for practice).

• (i) A parent’s story of a child who could not otherwise get to school.
• (ii) A table showing that 62 of 480 pupils use the minibus and that the service costs £9,800 a year, or about £158 per pupil.
• (iii) A comparison with the cost of hiring taxis for the same pupils (about £21,000 a year).
• (iv) A photograph of pupils laughing on the minibus.

Question. Which two would be most strategic for governors who must justify spending, and what job does each do?

Step 1: Analyse the audience. Governors value careful spending and need a defensible decision.

Step 2: Choose.

• (iii) The cost comparison strengthens the validity of the argument by showing the minibus is cheaper than the alternative.
• (ii) The usage table exemplifies and quantifies need and cost, giving the governors a number they can quote.

Step 3: Place the others.

• (i) The parent’s story is valuable, but as an illustration after the figures it adds a human case. It would be weaker as the main proof.
• (iv) The photograph sets a mood but says nothing about need or cost, so it contributes little for this audience.

Check. The choice is linked to the audience’s needs and values, and each piece has a named job. Choosing the photograph first because it is charming would ignore the audience.

Worked example 2: explaining what evidence does

Task. Read this passage, written by Marlbridge. Explain what the second sentence does for the argument.

The cuts to the library will hurt every part of the town. Last winter, between two and four on weekday afternoons, the reading room held eleven pensioners, six job-seekers and a student revising for her driving theory test, all within sight of the radiator. Take that room away and you take away not a service but a place where these seventeen people were, for a few hours, not alone and not cold.

Solution.

1. Exemplifies. The sentence gives a specific, representative case of who the library serves: pensioners, job-seekers and a student.
2. Illustrates and sets a mood. “Within sight of the radiator” is a small detail that makes the cold and warmth physical. The reader sees the room.
3. Appeals to emotion and values. The count of seventeen people and the phrase “not alone and not cold” evoke the values of care and community.
4. Supports the claim’s scope. The mix of people (pensioners, job-seekers, a student) supports “every part of the town” by showing variety.

Check. A weaker answer would say “it gives an example”. A stronger answer names several jobs and links each to the claim and the audience. Note that the example is specific and counted, which also builds credibility: it sounds like someone who was there.

How the exam asks about strategic evidence

• Reading: what a piece of evidence adds to the argument; why the writer includes a particular example; what effect an analogy has.
• Writing: which added sentence or detail best supports the writer’s purpose for the audience; which evidence is irrelevant to the claim.
• Essays: in the rhetorical analysis essay, explain why the writer chose a particular piece of evidence for this audience; in the synthesis and argument essays, choose evidence that does a job and says why.

Common misconceptions

• “Strong evidence is whatever is most dramatic.” It must also be relevant and credible. A dramatic but unrepresentative case can damage a writer’s credibility.
• “There is a single correct job for each type of evidence.” A statistic can clarify or amplify; an anecdote can illustrate or set a mood. Judge by context.
• “If the evidence is true, it is well chosen.” True evidence can still be irrelevant or a poor fit for the audience.
• “Writers should use all available evidence.” Quality and fit matter more than volume.
• “A famous source is always credible.” Credibility depends on whether the source is qualified and relevant to this question.
• “Analogies prove claims.” An analogy clarifies and persuades by association, but a comparison is never exact.

Where this leads

Topic 2.5, Sufficient evidence, asks how much evidence is enough. Before moving on, test yourself with the practice questions and the checklist.