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| Criterion |  Engineering Fault Isolation |  Product Discovery Assumption Mapping |  Product Discovery Fake Door Test |  Decision Making Assumption Surfacing |
|---|---|---|---|---|
Purposedifferent | In technical failures, the visible symptom often gets mixed up with the actual cause. Fault Isolation narrows the fault space and progressively reduces which part of the system is truly affected. | When assumptions still sit unordered in the room, it weighs uncertainty against leverage. It makes visible which hypotheses should be checked first. | 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. | Plans often contain assumptions that were never openly stated and remain dangerous precisely because of that. Assumption Surfacing makes these silent premises visible and prioritizes which of them carry the initiative or could sink it. |
Complexitydifferent | Medium | Medium | Medium | Low |
Timedifferent | 30-180 min | 45-60 min | 1-5 Tage | 45-90 min |
Participantsdifferent | 1-6 | 2-8 | Nutzertraffic | 2-8 |
Formatdifferent | Workshop + async | Workshop + async | Async | Workshop + async |
Outputdifferent | Fault Isolation Map, Test Log, Excluded Hypotheses, Narrowed Fault Area | Assumption map, Test backlog, Risk ranking | Click Data, Interest Signal, Learning Decision | Assumption List, Critical Assumptions, Learning Plan |
Tagsno overlap | TroubleshootingDiagnosisEngineering | AssumptionsRiskExperimentsValidation | ValidationExperimentsDemandDiscovery | AssumptionsRiskDecisionDiscovery |