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| Criterion |  UX Research Usability Testing |  Operations 5 Whys |  Operations 8D Problem Solving |  Operations Barrier Analysis |
|---|---|---|---|---|
Purposedifferent | 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. | 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 risk that can only be managed through multiple layers of protection, the method examines the effectiveness of each barrier. It shows where safeguards are missing, too weak, or fail under real conditions. |
Complexitydifferent | Medium | Low | High | Medium |
Timedifferent | 1-2 h je Session | 15-30 min | 1-6 Wochen | 2-4 h |
Participantsdifferent | Based on research question | 2-6 | 4-10 | 2-6 |
Formatdifferent | Workshop + async | Workshop | Workshop + async | Workshop + async |
Outputdifferent | Usability Issues, Severity List, Recommendations | Root cause notes, Countermeasures | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | Barrier Inventory, Failure Analysis per Barrier, Action Backlog |
Tagsno overlap | ValidationUXPrototype | Root causeIncidentLeanProblem solving | QualityProblem solvingRoot cause | Root causeSafetyIncident |