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| Criterion |  Operations Gemba Walk |  Engineering Fault Isolation |  Operations Failure Mode and Effects Analysis |
|---|---|---|---|
Purposedifferent | 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. | In technical failures, the visible symptom often gets mixed up with the actual cause. Fault Isolation narrows the fault space and progressively reduces which part of the system is truly affected. | 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 | Low | Medium | High |
Timedifferent | 30-120 min | 30-180 min | 2-6 h |
Participantsdifferent | 2-6 | 1-6 | 3-10 |
Formatdifferent | Workshop | Workshop + async | Workshop |
Outputdifferent | Observation Notes, Improvement Ideas | Fault Isolation Map, Test Log, Excluded Hypotheses, Narrowed Fault Area | FMEA Table, Risk Priority, Mitigation Actions |
Tagsno overlap | LeanObservationProcessOperations | TroubleshootingDiagnosisEngineering | RiskQualityOperationsRoot cause |
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