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| Criterion |  Engineering Hypothesis-Driven Troubleshooting |  Decision Making Delphi Method |  Operations 5 Whys |  Operations 8D Problem Solving |
|---|---|---|---|---|
Purposedifferent | When systems fail unexpectedly, spontaneous attempts often produce more noise than insight. Hypothesis-driven Troubleshooting translates symptoms into testable assumptions and makes troubleshooting learnable. | 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 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 | Medium | High | Low | High |
Timedifferent | 30-240 min | 1-4 Wochen | 15-30 min | 1-6 Wochen |
Participantsdifferent | 1-6 | 6-30 Experten | 2-6 | 4-10 |
Formatdifferent | Workshop + async | Async | Workshop | Workshop + async |
Outputdifferent | Hypothesis Log, Test Plan, Evidence Notes, Diagnosis Summary | Expert Forecast, Consensus Range, Assumption Notes | Root cause notes, Countermeasures | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan |
Tagsno overlap | TroubleshootingProblem solvingDiagnosis | ForecastingExpertsDecisionStrategy | Root causeIncidentLeanProblem solving | QualityProblem solvingRoot cause |