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| Criterion |  Operations After-Action Review |  Product Discovery Test Card |  DevOps Blameless Postmortem |  Product Discovery Hypothesis Prioritization 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 many hypotheses compete for attention, it brings order to their learning sequence and importance. It separates problem, assumption, solution, and evidence. The result is captured as a prioritization canvas and a hypothesis backlog. |
Complexitydifferent | Low | Low | Medium | Medium |
Timedifferent | 20-45 min | 20-35 min | 30-90 min | 60-90 min |
Participantsdifferent | 3-12 | 1-5 | 3-12 | 3-8 |
Formatdifferent | Workshop + async | Workshop + async | Workshop + async | Workshop |
Outputdifferent | Lessons learned, Action items, Event summary | Test Card with a pre-set threshold | Postmortem Doc, Action Items, Timeline | Prioritization Canvas, Hypothesis Backlog |
Tagsno overlap | LearningOperationsImprovement | ExperimentsValidationDiscoveryHypothesis | Site Reliability EngineeringIncidentLearningReliability | ExperimentsPrioritizationDiscoveryHypothesis |