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| Criterion |  Operations Fault Tree Analysis |  Operations 5 Whys |  Operations Gemba Walk |
|---|---|---|---|
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. | For a single, hard-to-explain deviation, the method exposes the causal chain behind the visible symptom. It keeps the cause open until a controllable condition emerges instead of a mere description. | 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. |
Complexitydifferent | High | Low | Low |
Timedifferent | 2-6 h | 15-30 min | 30-120 min |
Participantsdifferent | 3-8 | 2-6 | 2-6 |
Formatdifferent | Workshop + async | Workshop | Workshop |
Outputdifferent | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Root cause notes, Countermeasures | Observation Notes, Improvement Ideas |
Tagsno overlap | RiskRoot causeSafety | Root causeIncidentLeanProblem solving | LeanObservationProcessOperations |
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Methods with strong topical overlap with the current selection, not yet in the comparison.
