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| Criterion |  Operations After-Action Review |  Operations A3 Problem Solving |  DevOps Blameless Postmortem |  DevOps Game Day |
|---|---|---|---|---|
Purposedifferent | 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. | For a complex deviation with several people involved, the method bundles problem, analysis, and decision onto one page. It creates a shared working space where causes, countermeasures, and follow-up fit together. | 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 preparing for rare incidents, the method tests response capability under controlled conditions. It shows where assumptions about stability, roles, and recovery are too optimistic. |
Complexitydifferent | Low | Medium | Medium | High |
Timedifferent | 20-45 min | 45-90 min | 30-90 min | Halber Tag |
Participantsdifferent | 3-12 | 2-5 | 3-12 | 5-20 |
Formatdifferent | Workshop + async | Workshop + async | Workshop + async | Workshop |
Outputdifferent | Lessons learned, Action items, Event summary | A3 Report, Action Plan, Root Cause Analysis | Postmortem Doc, Action Items, Timeline | Simulation Notes, Gaps List, Updated Runbooks |
Tagsno overlap | LearningOperationsImprovement | LeanProblem solvingCoachingOperations | Site Reliability EngineeringIncidentLearningReliability | ResilienceOperationsIncident |