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| Criterion |  Product Discovery Fake Door Test |  UX Research User Interviews |  Growth A/B Testing |  Product Discovery Learning Card |
|---|---|---|---|---|
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. | The Learning Card connects traceable test results to a reasoned next action while keeping the limits of the insight visible. |
Complexitydifferent | Medium | Low | High | Low |
Timedifferent | 1-5 Tage | 30–60 min per interview | 1-4 Wochen | 25-40 min |
Participantsdifferent | Nutzertraffic | 1 participant per interview | 1-6 | 1-5 |
Formatdifferent | Async | Workshop + async | Async | Workshop + async |
Outputdifferent | Click Data, Interest Signal, Learning Decision | Interview Notes, Themes, Insight Summary | Experiment results, Decision log, Learning summary | Learning Card with evidence and next action |
Tagsno overlap | ValidationExperimentsDemandDiscovery | QualitativeResearchCustomerDiscovery | ExperimentsGrowthAnalyticsValidation | ExperimentsValidationDiscoveryLearning |