| Summary/Abstract |
An experimental study was conducted to test whether the version of the structured analytical method Analysis of Competing Hypotheses (ACH) taught by the Cabinet Office to the United Kingdom’s intelligence community provides effective mitigation of the cognitive biases of serial position effects and confirmation bias in an intelligence analysis. ACH had no statistically significant mitigative impact on the proportion of participants that exhibited serial position effects or confirmation bias, or the impact of confirmation bias on the analytical process. The most significant factor that influenced participants’ judgements of the credibility of information was the possibility of deception or dishonesty.
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