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| Criterion |  Operations 8D Problem Solving |  Operations Root Cause Analysis |  Operations 5 Whys |  Operations A3 Problem Solving |
|---|---|---|---|---|
Purposedifferent | 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. | 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. | 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 complex deviation with several people involved, the method bundles problem, analysis, and decision onto one page. It creates a shared working space where causes, countermeasures, and follow-up fit together. |
Complexitydifferent | High | Medium | Low | Medium |
Timedifferent | 1-6 Wochen | 1-4 h | 15-30 min | 45-90 min |
Participantsdifferent | 4-10 | 3-8 | 2-6 | 2-5 |
Formatdifferent | Workshop + async | Workshop + async | Workshop | Workshop + async |
Outputdifferent | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | Problem Statement, Cause Hypotheses, Confirmed Causes, Action Plan | Root cause notes, Countermeasures | A3 Report, Action Plan, Root Cause Analysis |
Tags1 shared | QualityProblem solvingRoot cause | Root causeProblem solvingQualityIncident | Root causeIncidentLeanProblem solving | LeanProblem solvingCoachingOperations |