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| Criterion |  Decision Making Delphi Method |  Operations Causal Factor Analysis |  Operations 5 Whys |  Operations 8D Problem Solving |
|---|---|---|---|---|
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 an event with a complicated course, the method breaks down the contributing factors along the timeline. It shows how conditions, decisions, and reactions together produce a course of events. | 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 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. |
Complexitydifferent | High | High | Low | High |
Timedifferent | 1-4 Wochen | 2-6 h | 15-30 min | 1-6 Wochen |
Participantsdifferent | 6-30 Experten | 3-10 | 2-6 | 4-10 |
Formatdifferent | Async | Workshop + async | Workshop | Workshop + async |
Outputdifferent | Expert Forecast, Consensus Range, Assumption Notes | Event Timeline, Causal Factor Chart, Cause List, Corrective Actions | Root cause notes, Countermeasures | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan |
Tagsno overlap | ForecastingExpertsDecisionStrategy | CausalityIncidentRoot causeTimeline | Root causeIncidentLeanProblem solving | QualityProblem solvingRoot cause |