Understand the skill
Evidence is information used to support or challenge a claim. Ask whether it is relevant, how it was obtained, whether the source can know, and how far the conclusion can reasonably extend. An anecdote may reveal a possibility but cannot alone establish how common something is. A number needs context: what was counted, when, and among whom?
More context and nuance
Distinguish an observation from an interpretation. Use fictional data in practice and label it as such. In real research, trace claims to their original source and compare appropriate independent sources. A credible source can still be quoted out of context. Report uncertainty and gaps rather than hiding them.
Keep the conclusion inside the evidence
Volunteers said they liked the activity.
The trial does not show that everyone will enjoy it. Volunteers may differ from other participants.
A method you can use
Match evidence to the claim.
Check origin, method, and scope.
State what it supports and what it cannot show.
Compare two attempts
Attempt A
Eight people liked the activity, so everyone will enjoy it.
Attempt B
In our fictional trial, eight of ten volunteers said they liked the activity. That suggests it appealed to this small group, but volunteers may differ from other participants.
Which attempt addresses the lesson’s stated communication goal more clearly?
- Attempt B
- Attempt A
- Both attempts address the stated goal equally well
Show a hint first
Ask what broader evidence would establish frequency and what alternative explanation remains.
Show the worked explanation
In our fictional trial, eight of ten volunteers said they liked the activity. That suggests it appealed to this small group, but volunteers may differ from other participants. The revision gives a denominator, labels the sample, and limits the conclusion. It does not turn a small selected group into everyone.
A common difficulty and its repair
Watch for
Treating a striking example as proof of a general pattern.
Try instead
Ask what broader evidence would establish frequency and what alternative explanation remains.
Practice at your level
Grade bands suggest a starting point. Move between them to suit the learner, task, and support available.
Grades K–2
An example assignment
Separate something you saw in a pretend picture from something you guessed about it.
Look for: Name observation and guess.
Two practice contexts
- Describe what an invented picture shows.
- Explain why a guess needs checking.
Context 1
Describe what an invented picture shows.
Which next step follows this lesson’s method for the supplied context?
- Match evidence to the claim.
- Repeat the known difficulty without changing the approach.
- Replace the message with unrelated details and ignore its purpose.
Show a hint first
Ask what broader evidence would establish frequency and what alternative explanation remains.
Show the worked explanation
Match evidence to the claim. Name observation and guess.
Context 2
Explain why a guess needs checking.
Which next step follows this lesson’s method for the supplied context?
- Repeat the known difficulty without changing the approach.
- Replace the message with unrelated details and ignore its purpose.
- Check origin, method, and scope.
Show a hint first
Ask what broader evidence would establish frequency and what alternative explanation remains.
Show the worked explanation
Check origin, method, and scope. Name observation and guess.
Grades 3–5
An example assignment
Use fictional class-vote totals to support a narrow claim, including the total number voting.
Look for: Keep the claim about that group.
Two practice contexts
- Interpret fictional class votes.
- Compare observation with opinion.
Context 1
Interpret fictional class votes.
Which next step follows this lesson’s method for the supplied context?
- Repeat the known difficulty without changing the approach.
- Replace the message with unrelated details and ignore its purpose.
- Match evidence to the claim.
Show a hint first
Ask what broader evidence would establish frequency and what alternative explanation remains.
Show the worked explanation
Match evidence to the claim. Keep the claim about that group.
Context 2
Compare observation with opinion.
Which next step follows this lesson’s method for the supplied context?
- Replace the message with unrelated details and ignore its purpose.
- Check origin, method, and scope.
- Repeat the known difficulty without changing the approach.
Show a hint first
Ask what broader evidence would establish frequency and what alternative explanation remains.
Show the worked explanation
Check origin, method, and scope. Keep the claim about that group.
Grades 6–8
An example assignment
Compare an anecdote, a small survey, and a documented observation for a specific claim.
Look for: Explain their different limits.
Two practice contexts
- Evaluate a small fictional survey.
- Choose evidence for a design claim.
Context 1
Evaluate a small fictional survey.
Which next step follows this lesson’s method for the supplied context?
- Replace the message with unrelated details and ignore its purpose.
- Match evidence to the claim.
- Repeat the known difficulty without changing the approach.
Show a hint first
Ask what broader evidence would establish frequency and what alternative explanation remains.
Show the worked explanation
Match evidence to the claim. Explain their different limits.
Context 2
Choose evidence for a design claim.
Which next step follows this lesson’s method for the supplied context?
- Check origin, method, and scope.
- Repeat the known difficulty without changing the approach.
- Replace the message with unrelated details and ignore its purpose.
Show a hint first
Ask what broader evidence would establish frequency and what alternative explanation remains.
Show the worked explanation
Check origin, method, and scope. Explain their different limits.
Grades 9–12
An example assignment
Evaluate sample evidence for relevance, selection bias, source expertise, and missing comparisons.
Look for: Calibrate the conclusion to the evidence.
Two practice contexts
- Assess a source’s ability to know.
- Limit a conclusion from incomplete data.
Context 1
Assess a source’s ability to know.
Which next step follows this lesson’s method for the supplied context?
- Match evidence to the claim.
- Repeat the known difficulty without changing the approach.
- Replace the message with unrelated details and ignore its purpose.
Show a hint first
Ask what broader evidence would establish frequency and what alternative explanation remains.
Show the worked explanation
Match evidence to the claim. Calibrate the conclusion to the evidence.
Context 2
Limit a conclusion from incomplete data.
Which next step follows this lesson’s method for the supplied context?
- Repeat the known difficulty without changing the approach.
- Replace the message with unrelated details and ignore its purpose.
- Check origin, method, and scope.
Show a hint first
Ask what broader evidence would establish frequency and what alternative explanation remains.
Show the worked explanation
Check origin, method, and scope. Calibrate the conclusion to the evidence.
A planning frame to study
The evidence is ____, obtained by ____. It supports ____ for ____. It does not establish ____.
Use the fixed scenarios in the argument builder to check the role of each part.
Open the fixed-choice argument builderWhat this lesson checks
- The evidence is relevant.
- Its source and limitations are clear.
- The conclusion stays within its scope.
The checks use predefined choices about the supplied examples. They do not evaluate an original speech or written response.