MENTAL MODEL · M4032

Outcome Bias

Learn & MetacognitionHigh supportCognitive Psychology

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Version 1.0.0 · Updated 2026-07-28

CORE DEFINITION

The outcome bias is an error made in evaluating the quality of a decision when the outcome of that decision is already known. Specifically, the outcome effect occurs when the same "behavior produce[s] more ethical condemnation when it happen[s] to produce bad rather than good outcome, even if the outcome is determined by chance".

SCAFFOLDING EFFECT

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Outcome bias refers to people evaluating the quality of a decision based on its final outcome, rather than on the information available at the time of the decision and the rationality of the process. The mechanism is that post-hoc information (the outcome) contaminates the evaluation of the prior decision, causing 'good luck' to be misread as 'wisdom' and 'bad luck' as 'stupidity'. It undermines the opportunity to learn from the process.

MINIMUM ACTION

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Practice this model in one real situation:

When reviewing, first reconstruct the information and reasoning available at the time of the decision, then compare with the outcome
establish a 'process scorecard' and separate evaluation criteria from the outcome
in performance evaluation, distinguish between controllable and uncontrollable factors
use pre-set decision criteria rather than post-hoc outcomes for accountability.

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Source support: Explicit

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