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| Criterion |  DevOps Blameless Postmortem |  Product Strategy DIBB |  Product Discovery Learning Card |  Product Discovery Test Card |
|---|---|---|---|---|
Purposedifferent | 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. | DIBB helps clarify target groups, value, goals, and priorities by making the logic behind a decision explicit. It captures results as a DIBB document, belief list, bet list, and learning report. | The Learning Card connects traceable test results to a reasoned next action while keeping the limits of the insight visible. | The Test Card turns a critical assumption into a testable claim and specifies in advance which result counts as success. |
Complexitydifferent | Medium | Low | Low | Low |
Timedifferent | 30-90 min | 1-2 h | 25-40 min | 20-35 min |
Participantsdifferent | 3-12 | 2-8 | 1-5 | 1-5 |
Formatsame | Workshop + async | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Postmortem Doc, Action Items, Timeline | DIBB document, Belief list, Bet list, Learning report | Learning Card with evidence and next action | Test Card with a pre-set threshold |
Tagsno overlap | Site Reliability EngineeringIncidentLearningReliability | StrategyDecisionAssumptionsHypothesis | ExperimentsValidationDiscoveryLearning | ExperimentsValidationDiscoveryHypothesis |