Illusion of Validity
Updated 2026-08-05
INTRODUCTION
English translation pending.
CORE DEFINITION
Described by Daniel Kahneman and Amos Tversky, the illusion of validity is the tendency to feel confident in a judgment when the information forms a coherent story, regardless of whether the cues actually predict the outcome. Interview performance, for example, feels highly informative about future job performance while predicting it weakly. Coherence is mistaken for validity, so the judge's confidence rises with the smoothness of the narrative rather than with its predictive accuracy.
SCAFFOLDING EFFECT
Reduce cognitive load
- Separate coherence from accuracy: ask whether the cues have ever predicted the outcome. - Anchor on base rates: compare the prediction against the plain statistical expectation for the group. - Check the story: note how much confidence comes from narrative smoothness alone.
Anchor fast decisions
The mind evaluates evidence by how well it fits into a consistent story, so coherent information generates a strong subjective sense of understanding. That sense is unrelated to predictive power, and because no feedback distinguishes the two, confidence tracks coherence rather than accuracy. Substituting base rates and simple statistical rules for holistic impressions breaks the link.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Illusion_of_validityverified
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