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| Criterion |  Innovation Double Diamond |  Product Discovery Solution Interview |  Product Discovery Fake Door Test |
|---|---|---|---|
Purposedifferent | For complex problems with a fuzzy situation, the method cleanly separates search space and decision. It first creates breadth in understanding and then focus in elaboration. This brings open questions, problem definition, and solution path into a traceable movement. | 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 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. |
Complexitysame | Medium | Medium | Medium |
Timedifferent | Wochen bis Monate | 30-60 min je Interview | 1-5 Tage |
Participantsdifferent | 3-12 | 5-10 Interviews | Nutzertraffic |
Formatdifferent | Workshop + async | Workshop + async | Async |
Outputdifferent | Problem Statement, Solution Options, Prototypes, Deliverables per Phase | Solution Feedback, Objection List, Validation Notes | Click Data, Interest Signal, Learning Decision |
Tagsno overlap | ProcessDivergenceInnovation | ValidationInterviewsPrototype | ValidationExperimentsDemandDiscovery |
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