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| Criterion |  DevOps Blameless Postmortem |  Knowledge Modeling Feynman Technique |  Agile Mad Sad Glad |  Agile 4Ls Retrospective |
|---|---|---|---|---|
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. | The Feynman Technique checks understanding by explaining a topic so that it stays easy for others to understand. It makes knowledge gaps visible before they become costly in everyday work. | When a team's or workshop's mood needs to become readable, it structures emotional signals with little setup. It makes strain, relief, and sources of energy tangible. | When a sprint should not only be assessed but also learned from, it captures experience in clear learning categories. It records what worked, what's missing, and what should run differently next time. |
Complexitydifferent | Medium | Low | Low | Low |
Timedifferent | 30-90 min | 20-60 min | 30-60 min | 45–75 min |
Participantsdifferent | 3-12 | 1 | 3-10 | Team members involved |
Formatdifferent | Workshop + async | Async | Workshop | Workshop |
Outputdifferent | Postmortem Doc, Action Items, Timeline | Plain-language Explanation, Knowledge Gaps, Study Notes | Emotion Board, Themes, Action Items | 4Ls Board, Learning Themes, Improvement Actions |
Tagsno overlap | Site Reliability EngineeringIncidentLearningReliability | LearningKnowledgeUnderstanding | RetrospectiveTeamReflection | RetrospectiveLearningReflectionTeam |