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| Criterion |  Engineering Fault Isolation |  Product Discovery Jobs to Be Done |  Operations 5 Whys |
|---|---|---|---|
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. | When switching motives and progress are unclear, it reconstructs the situation from real customer circumstances. It shows why a switch happens and what kind of progress is being sought. | 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. |
Complexitydifferent | Medium | Medium | Low |
Timedifferent | 30-180 min | 1-3 Wochen | 15-30 min |
Participantsdifferent | 1-6 | 5-12 Interviews | 2-6 |
Formatdifferent | Workshop + async | Workshop + async | Workshop |
Outputdifferent | Fault Isolation Map, Test Log, Excluded Hypotheses, Narrowed Fault Area | Job Stories, Outcome Statements, Opportunity List | Root cause notes, Countermeasures |
Tagsno overlap | TroubleshootingDiagnosisEngineering | CustomerOutcomesNeeds | Root causeIncidentLeanProblem solving |
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