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| Criterion |  UX Research User Interviews |  Decision Making Delphi Method |  Product Discovery Test Card |
|---|---|---|---|
Purposedifferent | 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 knowledge is distributed and direct dominance should be avoided, groups quickly fall under the sway of their opinion leaders. The Delphi Method gathers assessments iteratively and gradually brings expert judgments closer together. | The Test Card turns a critical assumption into a testable claim and specifies in advance which result counts as success. |
Complexitydifferent | Low | High | Low |
Timedifferent | 30–60 min per interview | 1-4 Wochen | 20-35 min |
Participantsdifferent | 1 participant per interview | 6-30 Experten | 1-5 |
Formatdifferent | Workshop + async | Async | Workshop + async |
Outputdifferent | Interview Notes, Themes, Insight Summary | Expert Forecast, Consensus Range, Assumption Notes | Test Card with a pre-set threshold |
Tagsno overlap | QualitativeResearchCustomerDiscovery | ForecastingExpertsDecisionStrategy | ExperimentsValidationDiscoveryHypothesis |
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