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| Criterion |  Operations 5 Whys |  Operations Learning Review |  Operations Kepner-Tregoe |  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. | After a project phase with mixed results, the method makes learning from the individual case reusable. It connects events, decisions, and systemic conditions into robust insights. | 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. |
Complexitydifferent | Low | Medium | High | High |
Timedifferent | 15-30 min | 1-3 h | 2-8 h | 1-6 Wochen |
Participantsdifferent | 2-6 | 3-10 | 2-8 | 4-10 |
Formatdifferent | Workshop | Workshop | Workshop + async | Workshop + async |
Outputdifferent | Root cause notes, Countermeasures | Learning Review Notes, System Factors, Improvement Actions | Problem Analysis, Decision Analysis, Risk Plan | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan |
Tagsno overlap | Root causeIncidentLeanProblem solving | LearningRetrospectiveIncidentOperations | Problem solvingRoot causeDecisionOperations | QualityProblem solvingRoot cause |