Cognitive biases affecting evidence evaluation

Cognitive biases are systematic ways people misinterpret information. In investigations, biases can influence memory, perception, and judgment, leading to unfair weighting of statements or evidence.

Common biases to watch for

• Confirmation bias — favoring information that supports a preferred conclusion
• Anchoring — relying too heavily on an initial piece of information
• Availability heuristic — overestimating what is most memorable
• Stereotyping and affinity bias — evaluating people based on group or personal similarity
• Outcome bias — judging evidence by the outcome rather than the process
• Self-serving bias — attributing outcomes to personal agency or luck

Mitigation involves structured evaluation tools, deliberate review, and peer input to limit bias.