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| Criterion |  UX Research Diary Study |  UX Research Usability Testing |  Innovation Design Thinking |  Product Discovery Solution 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 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 complex user problems with an uncertain cause, the method connects observation, interpretation, and experiment into a learning cycle. It keeps the focus on real needs and avoids premature solution language. This produces robust decisions for product and service. | 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. |
Complexitydifferent | Medium | Medium | High | Medium |
Timedifferent | 1-4 Wochen | 1-2 h je Session | 1 Tag bis mehrere Wochen | 30-60 min je Interview |
Participantsdifferent | 5-20 | Based on research question | 4-10 | 5-10 Interviews |
Formatdifferent | Async | Workshop + async | Workshop | Workshop + async |
Outputdifferent | Diary Entries, Longitudinal Patterns, Experience Timeline | Usability Issues, Severity List, Recommendations | Problem Statement, Prototype, Test Learnings | Solution Feedback, Objection List, Validation Notes |
Tagsno overlap | UX researchTrackingBehavior | ValidationUXPrototype | InnovationPrototypeResearch | ValidationInterviewsPrototype |