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| Criterion |  Engineering Fault Isolation |  Operations Process Mapping |  Operations 5 Whys |  Operations Gemba Walk |
|---|---|---|---|---|
Purposedifferent | 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. | With a confusing workflow that has many handoffs, the method makes the actual process visible. It shows where work is passed on, delayed, or duplicated, so improvement targets the right spots. | 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 | Medium | Medium | Low | Low |
Timedifferent | 30-180 min | 1-3 h | 15-30 min | 30-120 min |
Participantsdifferent | 1-6 | 3-10 | 2-6 | 2-6 |
Formatdifferent | Workshop + async | Workshop | Workshop | Workshop |
Outputdifferent | Fault Isolation Map, Test Log, Excluded Hypotheses, Narrowed Fault Area | Process Map, Handoff List, Improvement Backlog | Root cause notes, Countermeasures | Observation Notes, Improvement Ideas |
Tagsno overlap | TroubleshootingDiagnosisEngineering | ProcessOperationsImprovement | Root causeIncidentLeanProblem solving | LeanObservationProcessOperations |