A claim without evidence is just an opinion said louder. Writers reach for different kinds of evidence depending on their audience and purpose. Knowing the menu lets you name what a writer is doing — and notice what they conveniently left off the plate.
The main kinds of evidence
Most support falls into a handful of types. None is automatically strongest; each is strong for a particular audience and purpose. Statistics reassure a skeptical, data-minded reader but can numb; an anecdote makes an abstraction feel real but proves little on its own. Good arguments usually braid several types together.
| Type of evidence | Persuades best when… | Watch for |
|---|---|---|
| Facts & statistics | the audience distrusts feeling and wants proof | cherry-picked numbers; no source |
| Examples & anecdotes | an abstraction needs to feel concrete | one story treated as if it were the rule |
| Expert testimony | the writer's own authority is thin | vague or biased authorities |
| Analogy & comparison | a new idea needs a familiar shape | the two things differ where it counts |
| Personal experience | credibility (ethos) is the point | a sample of one |
The evidence menu — and the weakness that shadows each type.
Evidence does a job; name the job
On the exam, you rarely get points for merely identifying a piece of evidence. You get points for saying what it does: it makes a cost concrete, it pre-empts an objection, it transfers the authority of a trusted name onto a new idea. Read the example passage and ask not “what evidence is this?” but “what is this evidence for?”
Worked example 1
What kind of evidence does the writer use, and what job does it do?
The Cost of the Early Bell — Original passage for this workbook
My best student fell asleep in second period again last week. Not the bored kind of sleep — the head-snapping kind that comes when a body has simply run out. She had left home at 6:40 to make a 7:20 first bell, after a night that sleep science says her teenage brain was not built to end so early.
I could stop there and be dismissed as one sentimental teacher. So I will add the numbers: in districts that pushed the first bell to 8:30 or later, researchers recorded students sleeping roughly forty-five more minutes a night and teen car crashes falling by double digits — findings the sleep laboratories confirm and the critics have not overturned.
The writer braids two evidence types. First, an anecdote — the exhausted student asleep in second period — which makes the abstraction “early bells harm teenagers” visible and emotional (pathos through evidence).
Then, sensing that a skeptic will call the anecdote sentimental (“one sentimental teacher”), the writer pivots to a statistic (forty-five more minutes of sleep, double-digit drops in teen crashes) and pre-empts the objection by noting the labs “confirm” it and critics “have not overturned” it. The two types cover each other's weaknesses: the story supplies feeling, the numbers supply proof.
Common trap: More evidence is not always stronger evidence
A passage can pile up five anecdotes and still prove nothing, because five stories chosen by the same person are not a representative sample — they are five choices. Do not mistake quantity of evidence for quality of evidence.
When a question asks you to evaluate support, weigh relevance and representativeness, not word count.
Hack: Ask 'what would change my mind?'
To gauge how strong a body of evidence is, ask what it would take to overturn it. Strong evidence is the kind a fair skeptic would have to work to dismiss; weak evidence collapses at the first “but that's just one case.”
This question also finds the missing evidence — the counter-example the writer never mentions. Naming what a writer left out is a fast route to the sophistication point on the essays.
