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| Criterion |  Operations After-Action Review |  Operations Fault Tree Analysis |  Operations Gemba Walk |  Operations A3 Problem Solving |
|---|---|---|---|---|
Purposedifferent | 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. | For a critical top event with several possible triggers, the method logically models failure paths. It makes visible which combinations of conditions can lead to damage. | When there is uncertainty about the real course of a process, the method brings observation to the place where work happens. It combines perception, follow-up questions, and process knowledge so decisions rest on actual workflows instead of assumptions. | 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 | Low | High | Low | Medium |
Timedifferent | 20-45 min | 2-6 h | 30-120 min | 45-90 min |
Participantsdifferent | 3-12 | 3-8 | 2-6 | 2-5 |
Formatdifferent | Workshop + async | Workshop + async | Workshop | Workshop + async |
Outputdifferent | Lessons learned, Action items, Event summary | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Observation Notes, Improvement Ideas | A3 Report, Action Plan, Root Cause Analysis |
Tagsno overlap | LearningOperationsImprovement | RiskRoot causeSafety | LeanObservationProcessOperations | LeanProblem solvingCoachingOperations |