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| Criterion |  Operations 8D Problem Solving |  UX Research Usability Testing |  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. | When a product is built but people get stuck on tasks, usability testing shows the friction at concrete points. Observed use instead of self-report makes visible where orientation, understanding, or interaction breaks down. | 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 | Medium | Low |
Timedifferent | 1-6 Wochen | 1-2 h je Session | 15-30 min |
Participantsdifferent | 4-10 | Based on research question | 2-6 |
Formatdifferent | Workshop + async | Workshop + async | Workshop |
Outputdifferent | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | Usability Issues, Severity List, Recommendations | Root cause notes, Countermeasures |
Tagsno overlap | QualityProblem solvingRoot cause | ValidationUXPrototype | Root causeIncidentLeanProblem solving |
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