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| Criterion |  Operations After-Action Review |  Product Discovery Experiment Canvas |  DevOps Blameless Postmortem |  Product Discovery Test Card |
|---|---|---|---|---|
Purposedifferent | After missions or project phases with unclear outcomes, the method makes visible what actually happened and what can be learned from it. It separates course, effect, and causes so experience turns into solid improvement. | When experiments become unreadable after the fact, it arranges hypothesis, signal, and learning goal on a single canvas. It separates problem, assumption, solution, and evidence. The result is captured as a Completed Experiment Canvas and a Success Metric. | After an incident with damage or a near miss, the method creates a sober field for learning without assigning blame. It directs attention to the course of events, conditions, and effective countermeasures. | The Test Card turns a critical assumption into a testable claim and specifies in advance which result counts as success. |
Complexitydifferent | Low | Low | Medium | Low |
Timedifferent | 20-45 min | 30-60 min | 30-90 min | 20-35 min |
Participantsdifferent | 3-12 | 1-5 | 3-12 | 1-5 |
Formatsame | Workshop + async | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Lessons learned, Action items, Event summary | Completed Experiment Canvas, Success Metric | Postmortem Doc, Action Items, Timeline | Test Card with a pre-set threshold |
Tagsno overlap | LearningOperationsImprovement | ExperimentsValidationDiscoveryHypothesis | Site Reliability EngineeringIncidentLearningReliability | ExperimentsValidationDiscoveryHypothesis |