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| Criterion |  Product Discovery Fake Door Test |  UX Research User Interviews |  Growth A/B Testing |  Product Discovery Smoke Test |
|---|---|---|---|---|
Purposedifferent | 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. | 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 two variants compete, discussions quickly decide by taste rather than effect. A/B Testing checks behavior under controlled conditions and separates real improvement from chance or expectation effects. | When demand only needs to be roughly verified, it tests interest with minimal effort. It measures whether people would take a next step at all. |
Complexitydifferent | Medium | Low | High | Low |
Timedifferent | 1-5 Tage | 30–60 min per interview | 1-4 Wochen | 1-5 Tage |
Participantsdifferent | Nutzertraffic | 1 participant per interview | 1-6 | Nutzertraffic |
Formatdifferent | Async | Workshop + async | Async | Async |
Outputdifferent | Click Data, Interest Signal, Learning Decision | Interview Notes, Themes, Insight Summary | Experiment results, Decision log, Learning summary | Interest Metrics, Conversion Signal, Learning Note |
Tagsno overlap | ValidationExperimentsDemandDiscovery | QualitativeResearchCustomerDiscovery | ExperimentsGrowthAnalyticsValidation | ValidationExperimentsDemandGrowth |