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| Criterion |  Operations Gemba Walk |  Operations Process Mapping |  Engineering Hypothesis-Driven Troubleshooting |  Engineering Fault Isolation |
|---|---|---|---|---|
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. | 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. | When systems fail unexpectedly, spontaneous attempts often produce more noise than insight. Hypothesis-driven Troubleshooting translates symptoms into testable assumptions and makes troubleshooting learnable. | 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. |
Complexitydifferent | Low | Medium | Medium | Medium |
Timedifferent | 30-120 min | 1-3 h | 30-240 min | 30-180 min |
Participantsdifferent | 2-6 | 3-10 | 1-6 | 1-6 |
Formatdifferent | Workshop | Workshop | Workshop + async | Workshop + async |
Outputdifferent | Observation Notes, Improvement Ideas | Process Map, Handoff List, Improvement Backlog | Hypothesis Log, Test Plan, Evidence Notes, Diagnosis Summary | Fault Isolation Map, Test Log, Excluded Hypotheses, Narrowed Fault Area |
Tagsno overlap | LeanObservationProcessOperations | ProcessOperationsImprovement | TroubleshootingProblem solvingDiagnosis | TroubleshootingDiagnosisEngineering |