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| Criterion |  Innovation Lean Startup |  Engineering Fault Isolation |  Product Discovery Fake Door Test |
|---|---|---|---|
Purposedifferent | For uncertain business assumptions, the method forces the idea into contact with real market reactions early. It separates wishful picture, assumption, and observable behavior, so that learning becomes faster than planning. This translates uncertainty into measurable insight. | 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 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 je Lernzyklus | 30-180 min | 1-5 Tage |
Participantsdifferent | 2-8 | 1-6 | Nutzertraffic |
Formatdifferent | Workshop + async | Workshop + async | Async |
Outputdifferent | Hypothesis list, MVPs, Learning reports, Pivot or persevere decision | Fault Isolation Map, Test Log, Excluded Hypotheses, Narrowed Fault Area | Click Data, Interest Signal, Learning Decision |
Tagsno overlap | LeanStartupValidationMVP | TroubleshootingDiagnosisEngineering | ValidationExperimentsDemandDiscovery |
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