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| Criterion |  UX Research Usability Testing |  UX Research User Interviews |  Innovation Design Sprint |  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 teams derive needs only from assumptions and real motives are missing, user interviews give direct access to behavior and meaning. Conversations from the target group's everyday life make patterns, tensions, and open questions solidly visible. | When the product question is unclear and time pressure is high, the method takes a team from an open idea to a testable solution. It connects problem understanding, decision, and learning in one compact format, lowering the risk of spending a lot of energy on a mere guess. | 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 | Low | High | Medium |
Timedifferent | 1-2 h je Session | 30–60 min per interview | 4-5 Tage | 1-5 Tage |
Participantsdifferent | Based on research question | 1 participant per interview | 5-8 | Nutzertraffic |
Formatdifferent | Workshop + async | Workshop + async | Workshop | Async |
Outputdifferent | Usability Issues, Severity List, Recommendations | Interview Notes, Themes, Insight Summary | Prototype, Test Findings, Decision Rationale | Click Data, Interest Signal, Learning Decision |
Tagsno overlap | ValidationUXPrototype | QualitativeResearchCustomerDiscovery | Design sprintPrototypeValidationInnovation | ValidationExperimentsDemandDiscovery |