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| Criterion |  DevOps Blameless Postmortem |  Decision Making Pre-Mortem |  DevOps Game Day |  Operations After-Action Review |
|---|---|---|---|---|
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. | In early initiatives with many uncertainties, planning quickly turns too optimistic. A pre-mortem makes the expected failure visible in advance and sharpens the view of causes, gaps, and countermeasures. | 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 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 | Medium | Low | High | Low |
Timedifferent | 30-90 min | 20–45 min | Halber Tag | 20-45 min |
Participantsdifferent | 3-12 | Small cross-functional group | 5-20 | 3-12 |
Formatdifferent | Workshop + async | Workshop | Workshop | Workshop + async |
Outputdifferent | Postmortem Doc, Action Items, Timeline | Risk list, Mitigation plan, Assumption log | Simulation Notes, Gaps List, Updated Runbooks | Lessons learned, Action items, Event summary |
Tagsno overlap | Site Reliability EngineeringIncidentLearningReliability | RiskDecisionFailurePlanning | ResilienceOperationsIncident | LearningOperationsImprovement |