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| Criterion |  UX Research Usability Testing |  UX Research Affinity Diagramming |  Operations 5 Whys |
|---|---|---|---|
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. | 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 | Medium | Low | Low |
Timedifferent | 1-2 h je Session | 45–90 min | 15-30 min |
Participantsdifferent | Based on research question | 3-10 | 2-6 |
Formatdifferent | Workshop + async | Workshop | Workshop |
Outputdifferent | Usability Issues, Severity List, Recommendations | Theme clusters, Insight statements, Opportunity areas | Root cause notes, Countermeasures |
Tagsno overlap | ValidationUXPrototype | SynthesisQualitativeRoot cause | Root causeIncidentLeanProblem solving |
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