Outcome Bias

The tendency to judge the quality of a decision by its outcome rather than by the quality of the decision-making process at the time it was made. A good decision can produce a bad outcome (bad luck), and a bad decision can produce a good outcome (good luck)—but outcome bias makes us judge both by results rather than process. A surgeon who makes the correct decision but the patient dies is judged harshly; a surgeon who makes a reckless decision but the patient survives is praised. In business: strategies that succeed are retroactively judged as brilliant; identical strategies that fail are judged as foolish.

When to use it

When evaluating past decisions and tempted to judge by results; when designing performance evaluation systems that need to assess decision quality; when building a learning organization that improves decision processes; when outcome-dependent evaluation is discouraging sound risk-taking.

How it can help

Evaluate decisions based on the information and reasoning available AT THE TIME OF THE DECISION, not based on how things turned out. The practice: for important decisions, document your reasoning, the information available, the alternatives considered, and the estimated probabilities BEFORE the outcome is known. Then evaluate the decision based on that documentation, not the outcome. For teams: celebrate good decision processes even when outcomes are bad, and scrutinize bad decision processes even when outcomes are good. This is the only way to improve decision quality over time.