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| Criterion |  Decision Making Delphi Method |  Operations 5 Whys |  Operations Family Tree Analysis |
|---|---|---|---|
Purposedifferent | 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 series of incidents with a similar pattern, the method arranges individual events as branches of a common origin. It makes visible which conditions keep recurring. |
Complexitydifferent | High | Low | Medium |
Timedifferent | 1-4 Wochen | 15-30 min | 2-4 h |
Participantsdifferent | 6-30 Experten | 2-6 | 2-6 |
Formatdifferent | Async | Workshop | Workshop + async |
Outputdifferent | Expert Forecast, Consensus Range, Assumption Notes | Root cause notes, Countermeasures | Family Tree Diagram, Pattern Notes, Systemic Measures |
Tagsno overlap | ForecastingExpertsDecisionStrategy | Root causeIncidentLeanProblem solving | Root causePatternsIncidentSystemic |
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