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| Criterion |  Operations 5 Whys |  Operations Kepner-Tregoe |  Operations 8D Problem Solving |  Operations A3 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. | 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 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 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 | Low | High | High | Medium |
Timedifferent | 15-30 min | 2-8 h | 1-6 Wochen | 45-90 min |
Participantsdifferent | 2-6 | 2-8 | 4-10 | 2-5 |
Formatdifferent | Workshop | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Root cause notes, Countermeasures | Problem Analysis, Decision Analysis, Risk Plan | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | A3 Report, Action Plan, Root Cause Analysis |
Tags1 shared | Root causeIncidentLeanProblem solving | Problem solvingRoot causeDecisionOperations | QualityProblem solvingRoot cause | LeanProblem solvingCoachingOperations |