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| Criterion |  Operations 5 Whys |  Decision Making Delphi Method |  Operations Root Cause Tree Analysis |  Operations Kepner-Tregoe |
|---|---|---|---|---|
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. | 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 problem with several suspected causes, the method builds a causal structure instead of a mere list. It makes visible how causes connect and where the strongest points of leverage lie. | 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 | Low | High | Medium | High |
Timedifferent | 15-30 min | 1-4 Wochen | 1-3 h | 2-8 h |
Participantsdifferent | 2-6 | 6-30 Experten | 2-8 | 2-8 |
Formatdifferent | Workshop | Async | Workshop | Workshop + async |
Outputdifferent | Root cause notes, Countermeasures | Expert Forecast, Consensus Range, Assumption Notes | Cause Tree, Evidence Notes, Countermeasures | Problem Analysis, Decision Analysis, Risk Plan |
Tagsno overlap | Root causeIncidentLeanProblem solving | ForecastingExpertsDecisionStrategy | Root causeTreeIncidentQuality | Problem solvingRoot causeDecisionOperations |