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| Criterion |  Agile Sprint Retrospective |  DevOps Blameless Postmortem |  Architecture arc42 |  Operations After-Action Review |
|---|---|---|---|---|
Purposedifferent | 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. | 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. | arc42 structures architecture knowledge so teams can document system, decisions, and risks consistently. The template builds a living understanding of the architecture instead of scattered notes. | 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 | Low | Medium | Low | Low |
Timedifferent | Up to 3 hours for a one-month Sprint; shorter Sprints are usually shorter | 30-90 min | 1-2 Tage | 20-45 min |
Participantsdifferent | Scrum Team | 3-12 | 1-4 | 3-12 |
Formatdifferent | Workshop | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Improvement actions, Team agreements | Postmortem Doc, Action Items, Timeline | Architecture Document, Context View, Runtime View, Deployment View | Lessons learned, Action items, Event summary |
Tagsno overlap | RetrospectiveImprovementLearning | Site Reliability EngineeringIncidentLearningReliability | ArchitectureDocumentationCommunication | LearningOperationsImprovement |