Outcome Bias

Shrink Definition

Outcome bias is the tendency to judge the quality of a decision primarily by its eventual outcome rather than by the quality of the reasoning and information available when the decision was made.

Plain language

A lucky decision isn't always a good decision. An unlucky decision isn't always a bad one.

Shrink Insight

The outcome teaches. The process deserves evaluation.

Why it matters

Outcome bias influences: • leadership • medicine • investing • entrepreneurship • parenting • coaching • performance reviews Evaluating only results can reinforce poor decision-making while discouraging thoughtful risk-taking.

Common misunderstanding

People naturally assume successful outcomes prove good judgment. Reality is often more complicated. Chance also matters.

Shrink Perspective

Judge yourself by the quality of your thinking before the outcome, not only after it.

Shrink Reflection

Have you ever criticized yourself for a thoughtful decision simply because the result was disappointing?

Shrink Journal

Describe one important decision. Evaluate: Information available. Reasoning. Values considered. Only afterward consider the outcome.

Shrink Step

After your next significant decision, review your decision-making process before reviewing the result.

Shrink Minute

Wise decision-makers improve their process, not just celebrate outcomes.

Shrink Takeaway

Process compounds. Luck fluctuates.

Medical boundary

Evidence summary

Outcome bias has been extensively studied in behavioral economics, organizational psychology, medicine, and decision science as a common error in evaluating judgments under uncertainty.