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| Criterion |  Engineering Fault Isolation |  Product Discovery Riskiest Assumption Test |  Product Discovery MVP Test Matrix |  Product Discovery Fake Door Test |
|---|---|---|---|---|
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 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 several minimal variants compete to answer the same question, it makes comparing and choosing between them cleaner. It separates problem, assumption, solution, and evidence. The result is captured as a Test Matrix and a Test Plan. | 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 | 30-180 min | 1-2 Wochen pro Iteration | 45-75 min | 1-5 Tage |
Participantsdifferent | 1-6 | 2-6 | 2-8 | Nutzertraffic |
Formatdifferent | Workshop + async | Workshop + async | Workshop | Async |
Outputdifferent | Fault Isolation Map, Test Log, Excluded Hypotheses, Narrowed Fault Area | Prioritized Assumption List, Test Plan, Results Report | Test Matrix, Test Plan | Click Data, Interest Signal, Learning Decision |
Tagsno overlap | TroubleshootingDiagnosisEngineering | ExperimentsValidationDiscoveryAssumptions | ExperimentsValidationDiscoveryOptions | ValidationExperimentsDemandDiscovery |