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| Criterion |  Product Discovery Solution Interview |  UX Research Usability Testing |  UX Research Card Sorting |
|---|---|---|---|
Purposedifferent | When a solution idea is already on the table, it checks how it is understood and evaluated. It looks for resonance, objections, and missing fit early in the conversation. | 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 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 | Low |
Timedifferent | 30-60 min je Interview | 1-2 h je Session | 20-45 min |
Participantsdifferent | 5-10 Interviews | Based on research question | Based on research question |
Formatsame | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Solution Feedback, Objection List, Validation Notes | Usability Issues, Severity List, Recommendations | Content groups, Label set, IA hypotheses |
Tagsno overlap | ValidationInterviewsPrototype | ValidationUXPrototype | Information architectureNavigationStructure |
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