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| Criterion |  Engineering Fault Isolation |  Operations Kepner-Tregoe |  Operations Change Analysis |  Operations A3 Problem Solving |
|---|---|---|---|---|
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. | For a disturbance that's hard to pin down, the method cleanly separates problem, cause, and decision. It reduces mixing when symptoms allow several interpretations. | For a deviation after a change, the method isolates the influence of the altered condition. It narrows down which differences are relevant and which are just accompanying noise. | For a complex deviation with several people involved, the method bundles problem, analysis, and decision onto one page. It creates a shared working space where causes, countermeasures, and follow-up fit together. |
Complexitydifferent | Medium | High | Medium | Medium |
Timedifferent | 30-180 min | 2-8 h | 45-120 min | 45-90 min |
Participantsdifferent | 1-6 | 2-8 | 2-6 | 2-5 |
Formatsame | Workshop + async | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Fault Isolation Map, Test Log, Excluded Hypotheses, Narrowed Fault Area | Problem Analysis, Decision Analysis, Risk Plan | Change Matrix, Cause Hypotheses, Validation Questions, Action List | A3 Report, Action Plan, Root Cause Analysis |
Tagsno overlap | TroubleshootingDiagnosisEngineering | Problem solvingRoot causeDecisionOperations | ChangeRoot causeTroubleshootingComparison | LeanProblem solvingCoachingOperations |