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Mrs. Adams

Research›Evaluating Sources›Evaluate the Evidence

Evidence Quality

Evaluate the Evidence

Test whether a specific piece of evidence actually supports the claim being made, and learn how to adjust the claim when it does not.

Start with the connection

Evidence does not speak for itself.

A strong argument explains the relationship between the evidence and the exact claim. Select each part of the chain.

ClaimThe precise idea the writer wants the audience to accept.

Claim–Evidence Lab

Choose a type of evidence, make a judgment, and then compare your reasoning with the feedback.

Claim
“School uniforms improve academic performance.”
Evidence

One student says that she felt more focused after her school introduced uniforms.

How well does the evidence support the claim?

Judge the match, not whether the evidence sounds interesting.

Claim
“Most students at Central High support a later start time.”
Evidence

A representative random survey of 600 Central High students found that 68% supported beginning school later.

How well does the evidence support the claim?

Check population, method, and wording.

Claim
“Structured peer discussion causes higher argumentation scores.”
Evidence

An observational study found that participation in structured peer discussion was associated with higher scores after controlling for several background factors.

How well does the evidence support the claim?

Pay special attention to the verb in the claim.

Claim
“This policy will reduce teen homelessness by 40%.”
Evidence

One housing expert predicts that the policy will help, but provides no outcome data or estimate supporting the percentage.

How well does the evidence support the claim?

Expertise cannot replace missing evidence.

Claim
“Teen vaping is increasing rapidly.”
Evidence

A report states that the teen vaping rate was 12% last year, but provides no earlier rate for comparison.

How well does the evidence support the claim?

A number needs context before it can show a pattern.

Claim
“The policy creates transportation barriers for rural families.”
Evidence

Several rural families describe losing bus access and explain how the change affected their ability to reach services.

How well does the evidence support the claim?

Consider what testimony can reveal, and what it cannot measure.

Run three tests

A source can be credible while a particular piece of evidence is still a poor match for your claim.

1

Fit

Does this evidence address the exact claim, or only the same general topic?

2

Scope

Do the population, place, time, and strength of the claim stay inside the evidence’s boundaries?

3

Sufficiency

Is there enough relevant evidence, with enough variety, to earn audience confidence?

⚠ Strong evidence is not automatically sufficient evidence. One excellent study may still be only one part of the case.

Claim Language Tuner

Click each card to make the claim match what the evidence can honestly show.

Careful verbs do not weaken an argument. They show that the writer understands the evidence.

Evidence red flags

Pause when the claim stretches farther than the evidence.

Anecdotebecomes a generalization
Correlationbecomes causation
Small samplebecomes a universal claim
One studybecomes final proof
Statisticappears without context
Quotationreplaces the reasoning

Strong Match

The evidence directly supports the claim at the same level of precision and certainty.

Qualified Match

The evidence is useful after the claim is narrowed, softened, or bounded.

No Match

The evidence may be credible, but it does not support this claim. Find different evidence or make a different claim.

Your final question: “What, exactly, does this evidence allow me to say?”

Return to Evaluating Sources →
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Mrs. Adams' Tip

Before adding evidence to your argument, finish this sentence: “This evidence supports my claim because…” If the explanation becomes a leap, either revise the claim or keep looking.

Learning design informed by the College Board AP Seminar skills, the Digital Inquiry Group’s Evaluating Evidence and Evaluating Data lessons, the Toulmin model, and George Mason University’s Hedge Wisely. Featured video: Crash Course, “Evaluating Evidence.” Practice examples are fictional and were created for instruction.