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| Criterion |  Decision Making Wideband Delphi |  Operations Fault Tree Analysis |  Operations 8D Problem Solving |  Operations 5 Whys |
|---|---|---|---|---|
Purposedifferent | A single opinion rarely holds up for planning when the future is genuinely uncertain. It separates options, evaluation criteria, and open risks. The result is captured as an Estimate Range, Assumption Log, and Expert Consensus Notes. | 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 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. | 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 h or multiple rounds | 2-6 h | 1-6 Wochen | 15-30 min |
Participantsdifferent | 4-12 Experten | 3-8 | 4-10 | 2-6 |
Formatdifferent | Workshop + async | Workshop + async | Workshop + async | Workshop |
Outputdifferent | Estimate Range, Assumption Log, Expert Consensus Notes | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | Root cause notes, Countermeasures |
Tagsno overlap | EstimationExpertsForecasting | RiskRoot causeSafety | QualityProblem solvingRoot cause | Root causeIncidentLeanProblem solving |