Hindsight bias
Core pattern
After knowing the result, people remember the earlier uncertainty as cleaner and more predictable.
Ask: What did we actually believe before the outcome was known?
Compare Biases
Hindsight Bias vs Outcome Bias
Hindsight bias makes the outcome feel predictable after the fact; outcome bias uses the result to grade the earlier decision process.
Outcome bias
Core pattern
The result is used as evidence that the decision process was good or bad.
Ask: Was the process sound by the evidence available at the time?
Why people mix them up
Postmortems often slide from 'we should have known' into 'therefore the decision was bad.'
Quick rule
Ask whether the claim is about prior predictability or decision quality.
Diagnostic questions
Use these before deciding which label should carry the lesson.
Are people saying the result was obvious, or that the process was proven good or bad?
Do timestamped forecasts contradict the current story?
Would the process get the same grade if luck had gone the other way?
Mini cases
The same surface area can point to different underlying mechanisms.
Hindsight bias
After a vendor fails, people say the warning signs were obvious all along.
Why: The known result is making prior uncertainty disappear.
Outcome bias
A risky launch is praised as smart because it happened to work.
Why: The result is being used to grade the process.
Repair Move
Change the process, then choose the label.
Use decision journals: recover prior forecasts first, then grade process separately from outcome.
Study the entries
Use the comparison as a bridge into the fuller pages.
Hindsight bias
The tendency, after an outcome is known, to see it as having been more obvious or predictable than it actually was beforehand.
RecallOutcomePostmortems & learningForecasting & planning
Outcome bias
The tendency to judge the quality of a decision mainly by how things turned out rather than by the quality of the reasoning under the uncertainty that existed at the time.
EstimationOutcomePostmortems & learningTeams & management