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| Criterion |  Decision Making Delphi Method |  Operations 8D Problem Solving |  Systems Thinking Iceberg Model |  Operations Root Cause 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 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. | The Iceberg Model separates visible events from patterns, structures, and mental models. This turns a single observation into a deeper understanding of why a problem keeps recurring. | 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 | High | High | Low | Medium |
Timedifferent | 1-4 Wochen | 1-6 Wochen | 30-60 min | 1-4 h |
Participantsdifferent | 6-30 Experten | 4-10 | 2-10 | 3-8 |
Formatdifferent | Async | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Expert Forecast, Consensus Range, Assumption Notes | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | Iceberg Worksheet, Pattern Notes, Intervention Ideas | Problem Statement, Cause Hypotheses, Confirmed Causes, Action Plan |
Tagsno overlap | ForecastingExpertsDecisionStrategy | QualityProblem solvingRoot cause | Systems thinkingRoot causePatterns | Root causeProblem solvingQualityIncident |