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| Criterion |  DevOps Blameless Postmortem |  Product Discovery MVP Test Matrix |  Product Discovery Experiment Canvas |  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. | When several minimal variants compete to answer the same question, it makes comparing and choosing between them cleaner. It separates problem, assumption, solution, and evidence. The result is captured as a Test Matrix and a Test Plan. | 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. | The Test Card turns a critical assumption into a testable claim and specifies in advance which result counts as success. |
Complexitydifferent | Medium | Medium | Low | Low |
Timedifferent | 30-90 min | 45-75 min | 30-60 min | 20-35 min |
Participantsdifferent | 3-12 | 2-8 | 1-5 | 1-5 |
Formatdifferent | Workshop + async | Workshop | Workshop + async | Workshop + async |
Outputdifferent | Postmortem Doc, Action Items, Timeline | Test Matrix, Test Plan | Completed Experiment Canvas, Success Metric | Test Card with a pre-set threshold |
Tagsno overlap | Site Reliability EngineeringIncidentLearningReliability | ExperimentsValidationDiscoveryOptions | ExperimentsValidationDiscoveryHypothesis | ExperimentsValidationDiscoveryHypothesis |