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| Criterion |  UX Research Usability Testing |  UX Research Tree Testing |  Product Discovery Problem Interview |  UX Research Card Sorting |
|---|---|---|---|---|
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 a navigation exists but search paths still fail, tree testing checks findability without visual distraction. The method shows whether labels, levels, and paths really lead to the intended destination. | When the picture of the problem still needs to become solid, it asks about real situations and consequences. It separates genuine suffering from mere interest in a solution. | When content only makes sense internally and users can't find the structure again, card sorting exposes their mental order. Terms, groups, and naming are then aligned with the target group's expectations. |
Complexitydifferent | Medium | Medium | Medium | Low |
Timedifferent | 1-2 h je Session | 1-2 Tage | 30-60 min je Interview | 20-45 min |
Participantsdifferent | Based on research question | Based on research question | 5-12 Interviews | Based on research question |
Formatdifferent | Workshop + async | Async | Workshop + async | Workshop + async |
Outputdifferent | Usability Issues, Severity List, Recommendations | Findability Metrics, Path Analysis, Revised IA | Problem Evidence, Risk Notes, Customer Segments | Content groups, Label set, IA hypotheses |
Tagsno overlap | ValidationUXPrototype | Information architectureNavigationFindability | DiscoveryInterviewsValidation | Information architectureNavigationStructure |