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| Criterion |  DevOps Blameless Postmortem |  Systems Thinking Future Reality Tree |  Agile 4Ls Retrospective |  Systems Thinking Evaporating Cloud |
|---|---|---|---|---|
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. | A Future Reality Tree shows how desired actions are meant to lead to a better system state. The method checks whether a path of change holds together logically before time flows into implementation. | 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. | The method makes visible why two seemingly incompatible demands arise and which assumption must be tested to resolve the conflict. |
Complexitydifferent | Medium | High | Low | Medium |
Timedifferent | 30-90 min | 2-4 h | 45–75 min | 60-120 min |
Participantsdifferent | 3-12 | 3-8 | Team members involved | 2-8 |
Formatdifferent | Workshop + async | Workshop | Workshop | Workshop |
Outputdifferent | Postmortem Doc, Action Items, Timeline | Future Reality Tree, Negative Branches, Assumption List, Improved Injections | 4Ls Board, Learning Themes, Improvement Actions | Conflict Cloud, Assumption List, Breakthrough Ideas, Next Experiments |
Tagsno overlap | Site Reliability EngineeringIncidentLearningReliability | Theory of ConstraintsSystems thinkingChange | RetrospectiveLearningReflectionTeam | Theory of ConstraintsAssumptionsSystems thinking |