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| Criterion |  DevOps Blameless Postmortem |  Agile 4Ls Retrospective |  Operations 5 Whys |  Agile Start Stop Continue |
|---|---|---|---|---|
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. | 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. | For a single, hard-to-explain deviation, the method exposes the causal chain behind the visible symptom. It keeps the cause open until a controllable condition emerges instead of a mere description. | When a team wants to deliberately adjust its working behavior, it makes habits visible and assessable. It focuses on concrete changes instead of diffuse mood. |
Complexitydifferent | Medium | Low | Low | Low |
Timedifferent | 30-90 min | 45–75 min | 15-30 min | 30-60 min |
Participantsdifferent | 3-12 | Team members involved | 2-6 | 3-12 |
Formatdifferent | Workshop + async | Workshop | Workshop | Workshop |
Outputdifferent | Postmortem Doc, Action Items, Timeline | 4Ls Board, Learning Themes, Improvement Actions | Root cause notes, Countermeasures | Start Stop Continue Board, Improvement Actions |
Tagsno overlap | Site Reliability EngineeringIncidentLearningReliability | RetrospectiveLearningReflectionTeam | Root causeIncidentLeanProblem solving | RetrospectiveImprovementTeamReflection |