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| Criterion |  DevOps Blameless Postmortem |  Agile Sailboat Retrospective |  Agile 4Ls Retrospective |  Agile Sprint 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. | When a team wants to read momentum, brakes, and risks together, it offers an easily understandable picture of the situation. It makes drive, obstacles, and headwind visible in the same picture. | 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. | When a sprint is over and friction shouldn't simply be carried forward, it opens the view onto collaboration and patterns. It creates space to see causes and changes together. |
Complexitydifferent | Medium | Low | Low | Low |
Timedifferent | 30-90 min | 45-90 min | 45–75 min | Up to 3 hours for a one-month Sprint; shorter Sprints are usually shorter |
Participantsdifferent | 3-12 | 4-12 | Team members involved | Scrum Team |
Formatdifferent | Workshop + async | Workshop | Workshop | Workshop |
Outputdifferent | Postmortem Doc, Action Items, Timeline | Sailboat Board, Risks, Improvement Actions | 4Ls Board, Learning Themes, Improvement Actions | Improvement actions, Team agreements |
Tagsno overlap | Site Reliability EngineeringIncidentLearningReliability | RetrospectiveTeamImprovement | RetrospectiveLearningReflectionTeam | RetrospectiveImprovementLearning |