Credibility of Sources
Apply the CRAVEN framework to assess how much weight to give to different sources and their claims.
Key Terms
The CRAVEN Framework
Cambridge A-Level Critical Thinking uses the CRAVEN mnemonic to assess source credibility:
• Corroboration: Is the claim supported by independent evidence from other sources? • Reputation: Does the source have a known history of accuracy or inaccuracy? • Ability to Observe: Was the source in a position to directly observe what they claim? • Vested Interest: Does the source have something to gain or lose from the claim being accepted? • Expertise: Does the source have relevant knowledge, training, or experience? • Neutrality: Does the source have a bias that might distort their reporting?
Sources rarely score perfectly on all criteria. You must weigh multiple factors together.
Dr Amara Osei, a cardiologist with 20 years of experience, claims that a new drug reduces heart attacks by 40%. She was involved in designing the clinical trial that produced this finding.
Analysis: CRAVEN analysis: Expertise ✓ (cardiologist, 20 years). Ability to observe ✓ (involved in the trial). However: Vested interest ⚠ (she designed the trial — may have unconscious bias). Corroboration: needed from independent studies. Neutrality: potentially compromised. Overall: credible but requires independent corroboration.
Assessing Vested Interest
Vested interest is one of the most important credibility criteria. A source with a strong financial or personal stake in a particular outcome may — consciously or not — shade their claims to support that outcome. However, vested interest alone does not mean the source is wrong. You should: (1) identify the vested interest, (2) explain how it could bias the claim, and (3) note whether other credibility factors compensate.
Note: absence of vested interest increases credibility, but expertise is still needed.
A tobacco company releases a report claiming that moderate smoking poses minimal health risks.
Analysis: Strong vested interest: the company profits from tobacco sales. This gives a significant reason to distrust the report. However, if the methodology is sound and results are replicated by independent labs, the claim might still have some merit.
Corroboration and Selectivity
Corroboration — when independent sources agree on a claim — significantly increases credibility. "Independent" is key: sources that share funding, personnel, or ideology may appear to corroborate each other but actually represent a single viewpoint.
Beware of selectivity: citing only evidence that supports one position (cherry-picking) is a credibility concern. A credible source acknowledges contradictory evidence.
Three news articles all report the same political story, but all are from publications owned by the same media conglomerate.
Analysis: This appears to be corroboration but is not — they share ownership and editorial direction. True corroboration requires genuinely independent sources with no shared agenda.
Cambridge Exam Tips
- 💡When asked to assess credibility, use CRAVEN as a framework but do not just list the factors mechanically — apply them to the specific source in question.
- 💡Both positive and negative credibility factors matter. A source may have expertise (positive) but also strong vested interest (negative) — weigh both.
- 💡Always explain HOW a factor affects credibility. "Dr Smith has expertise" scores lower than "Dr Smith's 15 years as a climate scientist gives him the relevant technical knowledge to interpret atmospheric data reliably."
- 💡When asked how much weight to give a claim, give a judgement: "Significant weight," "some weight," or "little weight" — then justify with CRAVEN factors.
Practice Questions
All practice →A health food company publishes a study showing that its own product reduces the risk of heart disease by 40%. Which factor MOST undermines the credibility of this claim?
Answer in Practice →Using the CRAVEN criteria, assess the credibility of Dr Patel's claim.
Answer in Practice →