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| Criterion |  UX Research Usability Testing |  Product Discovery Opportunity Interview |  Product Discovery Test Card |  Product Discovery Fake Door Test |
|---|---|---|---|---|
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 opportunities are still hidden behind signals of need, it structures conversations around needs and obstacles. It looks for patterns that lead to new product opportunities. | The Test Card turns a critical assumption into a testable claim and specifies in advance which result counts as success. | When demand is still unclear, it measures interest in a feature before it is built. It separates real behavior from polite agreement and deliberately keeps build effort small. |
Complexitydifferent | Medium | Medium | Low | Medium |
Timedifferent | 1-2 h je Session | 30-60 min je Interview | 20-35 min | 1-5 Tage |
Participantsdifferent | Based on research question | 5-12 Interviews | 1-5 | Nutzertraffic |
Formatdifferent | Workshop + async | Workshop + async | Workshop + async | Async |
Outputdifferent | Usability Issues, Severity List, Recommendations | Interview Notes, Opportunity Themes, Customer Quotes | Test Card with a pre-set threshold | Click Data, Interest Signal, Learning Decision |
Tagsno overlap | ValidationUXPrototype | DiscoveryInterviewsOpportunityCustomer | ExperimentsValidationDiscoveryHypothesis | ValidationExperimentsDemandDiscovery |