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| Criterion |  Engineering Fault Isolation |  Facilitation Expectation Mapping |  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 roles, interfaces, or projects fail because of differing expectations, Expectation Mapping surfaces these differences. It shows what each side takes for granted and where the pictures diverge. | 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 | Low | Low |
Timedifferent | 30-180 min | 45-90 min | 15-30 min |
Participantsdifferent | 1-6 | 3-12 | 2-6 |
Formatdifferent | Workshop + async | Workshop | Workshop |
Outputdifferent | Fault Isolation Map, Test Log, Excluded Hypotheses, Narrowed Fault Area | Expectation Map, Alignment Notes, Agreements | Root cause notes, Countermeasures |
Tagsno overlap | TroubleshootingDiagnosisEngineering | AlignmentStakeholdersTeam | Root causeIncidentLeanProblem solving |
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