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| Criterion |  Systems Thinking Future Reality Tree |  DevOps Game Day |  DevOps Blameless Postmortem |  Operations After-Action Review |
|---|---|---|---|---|
Purposedifferent | 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. | In preparing for rare incidents, the method tests response capability under controlled conditions. It shows where assumptions about stability, roles, and recovery are too optimistic. | 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. | 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. |
Complexitydifferent | High | High | Medium | Low |
Timedifferent | 2-4 h | Halber Tag | 30-90 min | 20-45 min |
Participantsdifferent | 3-8 | 5-20 | 3-12 | 3-12 |
Formatdifferent | Workshop | Workshop | Workshop + async | Workshop + async |
Outputdifferent | Future Reality Tree, Negative Branches, Assumption List, Improved Injections | Simulation Notes, Gaps List, Updated Runbooks | Postmortem Doc, Action Items, Timeline | Lessons learned, Action items, Event summary |
Tagsno overlap | Theory of ConstraintsSystems thinkingChange | ResilienceOperationsIncident | Site Reliability EngineeringIncidentLearningReliability | LearningOperationsImprovement |