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| Criterion |  Operations After-Action Review |  Product Discovery Test Card |  DevOps Blameless Postmortem |  Product Discovery Experiment Canvas |
|---|---|---|---|---|
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. | The Test Card turns a critical assumption into a testable claim and specifies in advance which result counts as success. | 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. | 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. |
Complexitydifferent | Low | Low | Medium | Low |
Timedifferent | 20-45 min | 20-35 min | 30-90 min | 30-60 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 | Test Card with a pre-set threshold | Postmortem Doc, Action Items, Timeline | Completed Experiment Canvas, Success Metric |
Tagsno overlap | LearningOperationsImprovement | ExperimentsValidationDiscoveryHypothesis | Site Reliability EngineeringIncidentLearningReliability | ExperimentsValidationDiscoveryHypothesis |