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| Criterion |  Growth A/B Testing |  UX Research User Interviews |  Product Discovery Test Card |  Product Discovery Learning Card |
|---|---|---|---|---|
Purposedifferent | 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 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. | The Test Card turns a critical assumption into a testable claim and specifies in advance which result counts as success. | The Learning Card connects traceable test results to a reasoned next action while keeping the limits of the insight visible. |
Complexitydifferent | High | Low | Low | Low |
Timedifferent | 1-4 Wochen | 30–60 min per interview | 20-35 min | 25-40 min |
Participantsdifferent | 1-6 | 1 participant per interview | 1-5 | 1-5 |
Formatdifferent | Async | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Experiment results, Decision log, Learning summary | Interview Notes, Themes, Insight Summary | Test Card with a pre-set threshold | Learning Card with evidence and next action |
Tagsno overlap | ExperimentsGrowthAnalyticsValidation | QualitativeResearchCustomerDiscovery | ExperimentsValidationDiscoveryHypothesis | ExperimentsValidationDiscoveryLearning |