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| Criterion |  Operations 8D Problem Solving |  Operations MORT Analysis |  UX Research Affinity Diagramming |  Operations 5 Whys |
|---|---|---|---|---|
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. | For a safety-relevant event or a system with high protection requirements, the method examines where controls failed. It exposes both technical and organizational gaps. | When research notes, feedback, or observations sit unconnected side by side, affinity diagramming sorts the raw material into solid themes. Many individual points turn into patterns that make decisions and opportunities clearer. | 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. |
Complexitydifferent | High | High | Low | Low |
Timedifferent | 1-6 Wochen | Mehrere Tage bis Wochen | 45–90 min | 15-30 min |
Participantsdifferent | 4-10 | 2-6 | 3-10 | 2-6 |
Formatdifferent | Workshop + async | Workshop + async | Workshop | Workshop |
Outputdifferent | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | MORT Worksheets, Findings per Branch, Corrective Actions, Systemic Recommendations | Theme clusters, Insight statements, Opportunity areas | Root cause notes, Countermeasures |
Tags1 shared | QualityProblem solvingRoot cause | Root causeSafetySystemicIncident | SynthesisQualitativeRoot cause | Root causeIncidentLeanProblem solving |