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| Criterion |  Operations Fishbone Diagram |  Decision Making Delphi Method |  Operations 5 Whys |  Operations Root Cause Analysis |
|---|---|---|---|---|
Purposedifferent | When a problem has several possible contributing factors, the method sorts causes by cause areas. It prevents an initial hunch from blocking the view of other plausible drivers. | 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. | When a problem keeps recurring and the cause stays unclear, the method exposes the underlying mechanism. It separates symptom, guess, and robust explanation from one another. |
Complexitydifferent | Low | High | Low | Medium |
Timedifferent | 30-60 min | 1-4 Wochen | 15-30 min | 1-4 h |
Participantsdifferent | 2-8 | 6-30 Experten | 2-6 | 3-8 |
Formatdifferent | Workshop | Async | Workshop | Workshop + async |
Outputdifferent | Fishbone Diagram, Cause Categories, Investigation Backlog | Expert Forecast, Consensus Range, Assumption Notes | Root cause notes, Countermeasures | Problem Statement, Cause Hypotheses, Confirmed Causes, Action Plan |
Tagsno overlap | Root causeQualityOperations | ForecastingExpertsDecisionStrategy | Root causeIncidentLeanProblem solving | Root causeProblem solvingQualityIncident |