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| Criterion |  Knowledge Modeling IBIS |  Product Discovery Problem Interview |  Product Discovery Riskiest Assumption Test |  Product Discovery Fake Door Test |
|---|---|---|---|---|
Purposedifferent | IBIS structures thinking about complex questions as a sequence of issues, ideas, and arguments. The method keeps discussions open without forcing them into premature consensus. | 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. | When an idea hinges on one critical unknown, it prioritizes testing that exact piece of uncertainty first. It separates problem, assumption, solution, and evidence. The result is captured as a prioritized list of assumptions, a test plan, and a result report. | 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 | Medium |
Timedifferent | 1-3 h | 30-60 min je Interview | 1-2 Wochen pro Iteration | 1-5 Tage |
Participantsdifferent | 2-8 | 5-12 Interviews | 2-6 | Nutzertraffic |
Formatdifferent | Workshop + async | Workshop + async | Workshop + async | Async |
Outputdifferent | Issue Map, Positions, Argument Notes | Problem Evidence, Risk Notes, Customer Segments | Prioritized Assumption List, Test Plan, Results Report | Click Data, Interest Signal, Learning Decision |
Tagsno overlap | RationaleKnowledgeDecision | DiscoveryInterviewsValidation | ExperimentsValidationDiscoveryAssumptions | ValidationExperimentsDemandDiscovery |