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| Criterion |  Engineering Fault Isolation |  Decision Making Assumption Surfacing |  Product Discovery Fake Door Test |  Product Discovery Learning Card |
|---|---|---|---|---|
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. | 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. | 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. | The Learning Card connects traceable test results to a reasoned next action while keeping the limits of the insight visible. |
Complexitydifferent | Medium | Low | Medium | Low |
Timedifferent | 30-180 min | 45-90 min | 1-5 Tage | 25-40 min |
Participantsdifferent | 1-6 | 2-8 | Nutzertraffic | 1-5 |
Formatdifferent | Workshop + async | Workshop + async | Async | Workshop + async |
Outputdifferent | Fault Isolation Map, Test Log, Excluded Hypotheses, Narrowed Fault Area | Assumption List, Critical Assumptions, Learning Plan | Click Data, Interest Signal, Learning Decision | Learning Card with evidence and next action |
Tagsno overlap | TroubleshootingDiagnosisEngineering | AssumptionsRiskDecisionDiscovery | ValidationExperimentsDemandDiscovery | ExperimentsValidationDiscoveryLearning |