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| Criterion |  Engineering Fault Isolation |  Operations 8D Problem Solving |  Innovation TRIZ |  Operations Root Cause Analysis |
|---|---|---|---|---|
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 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. | For technical contradictions or trade-offs, the method looks for solutions that resolve opposing requirements at the same time. It translates limits into an explicit picture of conflict that becomes workable. This produces not just compromises but more elegant principles. | When a problem keeps recurring and the cause stays unclear, the method exposes the underlying mechanism. It separates symptom, guess, and robust explanation from one another. |
Complexitydifferent | Medium | High | High | Medium |
Timedifferent | 30-180 min | 1-6 Wochen | 1-4 h | 1-4 h |
Participantsdifferent | 1-6 | 4-10 | 2-8 | 3-8 |
Formatsame | Workshop + async | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Fault Isolation Map, Test Log, Excluded Hypotheses, Narrowed Fault Area | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | Contradiction Statement, Inventive Principles, Solution Concepts | Problem Statement, Cause Hypotheses, Confirmed Causes, Action Plan |
Tagsno overlap | TroubleshootingDiagnosisEngineering | QualityProblem solvingRoot cause | InnovationProblem solvingContradictionsCreativity | Root causeProblem solvingQualityIncident |