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| Criterion |  Decision Making Wideband Delphi |  Product Discovery Test Card |  Product Discovery Learning Card |  Product Discovery Fake Door Test |
|---|---|---|---|---|
Purposedifferent | A single opinion rarely holds up for planning when the future is genuinely uncertain. It separates options, evaluation criteria, and open risks. The result is captured as an Estimate Range, Assumption Log, and Expert Consensus Notes. | 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. | 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 | High | Low | Low | Medium |
Timedifferent | 1-4 h or multiple rounds | 20-35 min | 25-40 min | 1-5 Tage |
Participantsdifferent | 4-12 Experten | 1-5 | 1-5 | Nutzertraffic |
Formatdifferent | Workshop + async | Workshop + async | Workshop + async | Async |
Outputdifferent | Estimate Range, Assumption Log, Expert Consensus Notes | Test Card with a pre-set threshold | Learning Card with evidence and next action | Click Data, Interest Signal, Learning Decision |
Tagsno overlap | EstimationExpertsForecasting | ExperimentsValidationDiscoveryHypothesis | ExperimentsValidationDiscoveryLearning | ValidationExperimentsDemandDiscovery |