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| Criterion |  Operations Failure Mode and Effects Analysis |  Operations Gemba Walk |  Operations Root Cause Tree Analysis |  Operations Fishbone Diagram |
|---|---|---|---|---|
Purposedifferent | 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. | 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 problem with several suspected causes, the method builds a causal structure instead of a mere list. It makes visible how causes connect and where the strongest points of leverage lie. | When a problem has several possible contributing factors, the method sorts causes by cause areas. It prevents an initial hunch from blocking the view of other plausible drivers. |
Complexitydifferent | High | Low | Medium | Low |
Timedifferent | 2-6 h | 30-120 min | 1-3 h | 30-60 min |
Participantsdifferent | 3-10 | 2-6 | 2-8 | 2-8 |
Formatsame | Workshop | Workshop | Workshop | Workshop |
Outputdifferent | FMEA Table, Risk Priority, Mitigation Actions | Observation Notes, Improvement Ideas | Cause Tree, Evidence Notes, Countermeasures | Fishbone Diagram, Cause Categories, Investigation Backlog |
Tagsno overlap | RiskQualityOperationsRoot cause | LeanObservationProcessOperations | Root causeTreeIncidentQuality | Root causeQualityOperations |