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| Criterion |  DevOps Blameless Postmortem |  Operations Accountability Ladder |  Operations Barrier Analysis |  Agile 4Ls Retrospective |
|---|---|---|---|---|
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. | With defensive reactions to problems, the method shifts the view from justification to ownership. It makes visible which reaction stage a person or team is currently stuck on. | For a risk that can only be managed through multiple layers of protection, the method examines the effectiveness of each barrier. It shows where safeguards are missing, too weak, or fail under real conditions. | 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. |
Complexitydifferent | Medium | Low | Medium | Low |
Timedifferent | 30-90 min | 20-45 min | 2-4 h | 45–75 min |
Participantsdifferent | 3-12 | 1-8 | 2-6 | Team members involved |
Formatdifferent | Workshop + async | Workshop + async | Workshop + async | Workshop |
Outputdifferent | Postmortem Doc, Action Items, Timeline | Ownership Reflection, Action Commitment, Coaching Notes | Barrier Inventory, Failure Analysis per Barrier, Action Backlog | 4Ls Board, Learning Themes, Improvement Actions |
Tagsno overlap | Site Reliability EngineeringIncidentLearningReliability | ResponsibilityLeadershipTeam | Root causeSafetyIncident | RetrospectiveLearningReflectionTeam |