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| Criterion |  Operations 5 Whys |  Engineering Fault Isolation |  Operations Family Tree Analysis |  Operations 8D Problem Solving |
|---|---|---|---|---|
Purposedifferent | 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. | 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 series of incidents with a similar pattern, the method arranges individual events as branches of a common origin. It makes visible which conditions keep recurring. | For an acute quality or delivery problem, the method structures immediate protection and root cause work together. It keeps the situation stable while the actual cause is investigated cleanly. |
Complexitydifferent | Low | Medium | Medium | High |
Timedifferent | 15-30 min | 30-180 min | 2-4 h | 1-6 Wochen |
Participantsdifferent | 2-6 | 1-6 | 2-6 | 4-10 |
Formatdifferent | Workshop | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Root cause notes, Countermeasures | Fault Isolation Map, Test Log, Excluded Hypotheses, Narrowed Fault Area | Family Tree Diagram, Pattern Notes, Systemic Measures | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan |
Tagsno overlap | Root causeIncidentLeanProblem solving | TroubleshootingDiagnosisEngineering | Root causePatternsIncidentSystemic | QualityProblem solvingRoot cause |