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| Criterion |  Product Discovery Solution Interview |  Decision Making Delphi Method |  Product Discovery Fake Door Test |  Product Discovery Problem Interview |
|---|---|---|---|---|
Purposedifferent | When a solution idea is already on the table, it checks how it is understood and evaluated. It looks for resonance, objections, and missing fit early in the conversation. | 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. | 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 the picture of the problem still needs to become solid, it asks about real situations and consequences. It separates genuine suffering from mere interest in a solution. |
Complexitydifferent | Medium | High | Medium | Medium |
Timedifferent | 30-60 min je Interview | 1-4 Wochen | 1-5 Tage | 30-60 min je Interview |
Participantsdifferent | 5-10 Interviews | 6-30 Experten | Nutzertraffic | 5-12 Interviews |
Formatdifferent | Workshop + async | Async | Async | Workshop + async |
Outputdifferent | Solution Feedback, Objection List, Validation Notes | Expert Forecast, Consensus Range, Assumption Notes | Click Data, Interest Signal, Learning Decision | Problem Evidence, Risk Notes, Customer Segments |
Tagsno overlap | ValidationInterviewsPrototype | ForecastingExpertsDecisionStrategy | ValidationExperimentsDemandDiscovery | DiscoveryInterviewsValidation |