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| Criterion |  Operations Fault Tree Analysis |  Operations Gemba Walk |  Operations 8D Problem Solving |  Operations Failure Mode and Effects Analysis |
|---|---|---|---|---|
Purposedifferent | 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 an acute quality or delivery problem, the method structures immediate protection and root cause work together. It keeps the situation stable while the actual cause is investigated cleanly. | For a process, product, or service with noticeable failure risks, the method assesses possible failure modes in advance. It directs attention to combinations of occurrence, effect, and detectability. |
Complexitydifferent | High | Low | High | High |
Timedifferent | 2-6 h | 30-120 min | 1-6 Wochen | 2-6 h |
Participantsdifferent | 3-8 | 2-6 | 4-10 | 3-10 |
Formatdifferent | Workshop + async | Workshop | Workshop + async | Workshop |
Outputdifferent | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Observation Notes, Improvement Ideas | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | FMEA Table, Risk Priority, Mitigation Actions |
Tagsno overlap | RiskRoot causeSafety | LeanObservationProcessOperations | QualityProblem solvingRoot cause | RiskQualityOperationsRoot cause |