Evaluating Spoken Sources

Relevance

A reliable source may still be irrelevant to your question.

Ask whether the speaker addresses the same topic, population, place, time period and purpose that you need.

Expertise and access to information

Ask why this speaker is in a position to know.

An eyewitness can describe what they personally observed; a researcher may be better placed to explain findings from a large study.

Different forms of expertise support different kinds of claims.

Evidence

Listen for where claims come from.

Does the speaker cite data, examples, documents, research or clearly identified experience?

A strong-sounding claim without evidence should not be accepted merely because the delivery is confident.

Purpose and interests

Consider whether the source aims to inform, persuade, entertain, advertise or defend a position.

A possible interest does not automatically make a source false, but it is relevant context when evaluating the claims.

Editing and missing context

Audio and video can be edited. Short clips may remove qualifications or surrounding context.

When an important claim depends on a brief excerpt, look for the fuller source if possible.

Usefulness depends on your purpose

A personal interview may be excellent evidence of one person's experience but weak evidence for a claim about an entire population.

At advanced levels, evaluate not only whether a source is credible but what it can legitimately be used to support.

Source A is an interview with one commuter describing a difficult journey.

Source B is a transport agency presentation summarising travel-time data from thousands of journeys.

The interview is useful for understanding an individual experience; the larger dataset is more suitable for describing general travel-time patterns.

Neither source is automatically 'better' for every purpose.

1. Identify the speaker and source.
2. Clarify the purpose of the recording.
3. Ask what the speaker is actually in a position to know.
4. Separate claims from supporting evidence.
5. Check whether important evidence is named clearly enough to verify.
6. Notice possible interests, selection or editing.
7. Compare important claims with independent sources when possible.
8. Judge usefulness in relation to your specific question.

Mistake: Trusting a claim because the speaker sounds confident.

Better: Evaluate evidence and expertise.

Mistake: Rejecting every source with an interest or viewpoint.

Better: Note the interest and examine whether the evidence still supports the claim.

Mistake: Treating a personal experience as representative of everyone.

Better: Match the type of evidence to the scope of the conclusion.

Mistake: Evaluating credibility but forgetting relevance.

Better: Ask whether the source actually helps answer your question.

A podcast guest makes a broad claim about teenagers based only on what happened to two people they know. What is the strongest evaluation?

• A. The claim is reliable because it was said in a podcast.
• B. The examples may illustrate individual experiences but are too limited to establish a general pattern.
• C. Personal experience is always stronger than larger studies.
• D. The claim must be false because the guest is not reading from a written text.

Answer: B. The evidence may be relevant as experience but does not justify a broad population-level conclusion.

• Evaluate spoken sources as critically as written ones.
• Relevance and reliability are different questions.
• Consider expertise, evidence, purpose and possible interests.
• Remember that audio and video can be edited.
• Match the scope of the evidence to the scope of the claim.
• At advanced levels, judge what a source is useful for, not just whether it seems trustworthy.