MENTAL MODEL · M4723

Availability Heuristic

Learn & MetacognitionHigh supportCognitive Psychology

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Version 1.0.0 · Updated 2026-07-30

CORE DEFINITION

People tend to judge the probability of an event based on how easily examples of it come to mind; events that are easily recalled are considered more likely to occur.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

Understanding biases in probability judgment. The availability heuristic explains why people overestimate the probability of plane crashes (because news is easily recalled), why recent events have a greater impact, and how to understand and correct systematic errors in probability judgment.

anchor

Anchor fast decisions

People use 'ease of memory retrieval' as a proxy for 'event frequency or probability'. Vivid, recent, and emotional events are more easily retrieved and thus overestimated; rare but mundane events are underestimated. This is a heuristic substitution (using availability instead of the true base rate).

MINIMUM ACTION

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Practice this model in one real situation:

As a corrective measure—1) Identify whether a judgment is based on 'what easily comes to mind'
Check objective statistics or base rates
Distinguish media exposure from actual frequency
Use data to correct impressions
Systematically assess rare risks.

Check to track your progress (stored locally)

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Source support: Explicit

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en.wikipedia.orghttps://en.wikipedia.org/wiki/Availability_heuristicZH · Explicit
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