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| Criterion |  Decision Making Delphi Method |  Operations Failure Mode and Effects Analysis |  Operations Root Cause 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 process, product, or service with noticeable failure risks, the method assesses possible failure modes in advance. It directs attention to combinations of occurrence, effect, and detectability. | 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 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 | Medium | Low |
Timedifferent | 1-4 Wochen | 2-6 h | 1-3 h | 15-30 min |
Participantsdifferent | 6-30 Experten | 3-10 | 2-8 | 2-6 |
Formatdifferent | Async | Workshop | Workshop | Workshop |
Outputdifferent | Expert Forecast, Consensus Range, Assumption Notes | FMEA Table, Risk Priority, Mitigation Actions | Cause Tree, Evidence Notes, Countermeasures | Root cause notes, Countermeasures |
Tagsno overlap | ForecastingExpertsDecisionStrategy | RiskQualityOperationsRoot cause | Root causeTreeIncidentQuality | Root causeIncidentLeanProblem solving |