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| Criterion |  UX Research Usability Testing |  Operations 5 Whys |  Operations Failure Mode and Effects 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 a process, product, or service with noticeable failure risks, the method assesses possible failure modes in advance. It directs attention to combinations of occurrence, effect, and detectability. |
Complexitydifferent | Medium | Low | High |
Timedifferent | 1-2 h je Session | 15-30 min | 2-6 h |
Participantsdifferent | Based on research question | 2-6 | 3-10 |
Formatdifferent | Workshop + async | Workshop | Workshop |
Outputdifferent | Usability Issues, Severity List, Recommendations | Root cause notes, Countermeasures | FMEA Table, Risk Priority, Mitigation Actions |
Tagsno overlap | ValidationUXPrototype | Root causeIncidentLeanProblem solving | RiskQualityOperationsRoot cause |
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