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| Criterion |  UX Research Diary Study |  Product Discovery Solution Interview |  UX Research Card Sorting |  Product Discovery Problem Interview |
|---|---|---|---|---|
Purposedifferent | When experiences build up over days or weeks and a single session cannot capture them, Diary Study records the course of everyday life. Recurring triggers, moods, and habits become visible this way, beyond the sharpness of memory. | 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 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. | 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. |
Complexitydifferent | Medium | Medium | Low | Medium |
Timedifferent | 1-4 Wochen | 30-60 min je Interview | 20-45 min | 30-60 min je Interview |
Participantsdifferent | 5-20 | 5-10 Interviews | Based on research question | 5-12 Interviews |
Formatdifferent | Async | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Diary Entries, Longitudinal Patterns, Experience Timeline | Solution Feedback, Objection List, Validation Notes | Content groups, Label set, IA hypotheses | Problem Evidence, Risk Notes, Customer Segments |
Tagsno overlap | UX researchTrackingBehavior | ValidationInterviewsPrototype | Information architectureNavigationStructure | DiscoveryInterviewsValidation |