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| Criterion |  UX Research Diary Study |  Product Discovery Solution Interview |  Innovation Design Thinking |  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. | 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 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 | High | Medium |
Timedifferent | 1-4 Wochen | 30-60 min je Interview | 1 Tag bis mehrere Wochen | 30-60 min je Interview |
Participantsdifferent | 5-20 | 5-10 Interviews | 4-10 | 5-12 Interviews |
Formatdifferent | Async | Workshop + async | Workshop | Workshop + async |
Outputdifferent | Diary Entries, Longitudinal Patterns, Experience Timeline | Solution Feedback, Objection List, Validation Notes | Problem Statement, Prototype, Test Learnings | Problem Evidence, Risk Notes, Customer Segments |
Tagsno overlap | UX researchTrackingBehavior | ValidationInterviewsPrototype | InnovationPrototypeResearch | DiscoveryInterviewsValidation |