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| Criterion |  Decision Making Delphi Method |  Operations MORT Analysis |  Operations Fault Tree Analysis |  Operations 5 Whys |
|---|---|---|---|---|
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 safety-relevant event or a system with high protection requirements, the method examines where controls failed. It exposes both technical and organizational gaps. | For a critical top event with several possible triggers, the method logically models failure paths. It makes visible which combinations of conditions can lead to damage. | 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. |
Complexitydifferent | High | High | High | Low |
Timedifferent | 1-4 Wochen | Mehrere Tage bis Wochen | 2-6 h | 15-30 min |
Participantsdifferent | 6-30 Experten | 2-6 | 3-8 | 2-6 |
Formatdifferent | Async | Workshop + async | Workshop + async | Workshop |
Outputdifferent | Expert Forecast, Consensus Range, Assumption Notes | MORT Worksheets, Findings per Branch, Corrective Actions, Systemic Recommendations | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Root cause notes, Countermeasures |
Tagsno overlap | ForecastingExpertsDecisionStrategy | Root causeSafetySystemicIncident | RiskRoot causeSafety | Root causeIncidentLeanProblem solving |