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| Criterion |  Operations Kepner-Tregoe |  Operations 5 Whys |  Operations Kaizen Event |  Operations 8D Problem Solving |
|---|---|---|---|---|
Purposedifferent | 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 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 tightly scoped process segment with noticeable waste, the method bundles shared energy for change. It suits situations that call for fast learning loops and visible adjustments. | 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 | High | Low | Medium | High |
Timedifferent | 2-8 h | 15-30 min | 0.5-5 Tage | 1-6 Wochen |
Participantsdifferent | 2-8 | 2-6 | 4-10 | 4-10 |
Formatdifferent | Workshop + async | Workshop | Workshop | Workshop + async |
Outputdifferent | Problem Analysis, Decision Analysis, Risk Plan | Root cause notes, Countermeasures | Kaizen Charter, Waste List, Improvement Experiments, Standard Work Update | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan |
Tagsno overlap | Problem solvingRoot causeDecisionOperations | Root causeIncidentLeanProblem solving | LeanContinuous improvementOperations | QualityProblem solvingRoot cause |