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| Criterion |  Decision Making Delphi Method |  Operations 5 Whys |  Operations Barrier 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 risk that can only be managed through multiple layers of protection, the method examines the effectiveness of each barrier. It shows where safeguards are missing, too weak, or fail under real conditions. |
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 | Barrier Inventory, Failure Analysis per Barrier, Action Backlog |
Tagsno overlap | ForecastingExpertsDecisionStrategy | Root causeIncidentLeanProblem solving | Root causeSafetyIncident |
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