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| Criterion |  Operations Kaizen Event |  Operations After-Action Review |  DevOps Blameless Postmortem |  Operations A3 Problem Solving |
|---|---|---|---|---|
Purposedifferent | For a tightly scoped process segment with noticeable waste, the method bundles shared energy for change. It suits situations that call for fast learning loops and visible adjustments. | 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. | 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. | 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. |
Complexitydifferent | Medium | Low | Medium | Medium |
Timedifferent | 0.5-5 Tage | 20-45 min | 30-90 min | 45-90 min |
Participantsdifferent | 4-10 | 3-12 | 3-12 | 2-5 |
Formatdifferent | Workshop | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Kaizen Charter, Waste List, Improvement Experiments, Standard Work Update | Lessons learned, Action items, Event summary | Postmortem Doc, Action Items, Timeline | A3 Report, Action Plan, Root Cause Analysis |
Tagsno overlap | LeanContinuous improvementOperations | LearningOperationsImprovement | Site Reliability EngineeringIncidentLearningReliability | LeanProblem solvingCoachingOperations |