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| Criterion |  Operations 8D Problem Solving |  Decision Making Delphi Method |  Operations 5 Whys |  Operations Kepner-Tregoe |
|---|---|---|---|---|
Purposedifferent | 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. | When knowledge is distributed and direct dominance should be avoided, groups quickly fall under the sway of their opinion leaders. The Delphi Method gathers assessments iteratively and gradually brings expert judgments closer together. | 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. |
Complexitydifferent | High | High | Low | High |
Timedifferent | 1-6 Wochen | 1-4 Wochen | 15-30 min | 2-8 h |
Participantsdifferent | 4-10 | 6-30 Experten | 2-6 | 2-8 |
Formatdifferent | Workshop + async | Async | Workshop | Workshop + async |
Outputdifferent | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | Expert Forecast, Consensus Range, Assumption Notes | Root cause notes, Countermeasures | Problem Analysis, Decision Analysis, Risk Plan |
Tagsno overlap | QualityProblem solvingRoot cause | ForecastingExpertsDecisionStrategy | Root causeIncidentLeanProblem solving | Problem solvingRoot causeDecisionOperations |