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| Criterion |  Engineering Fault Isolation |  Product Discovery Fake Door Test |  Product Discovery Test Card |  Product Discovery Experiment Canvas |
|---|---|---|---|---|
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 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 Test Card turns a critical assumption into a testable claim and specifies in advance which result counts as success. | When experiments become unreadable after the fact, it arranges hypothesis, signal, and learning goal on a single canvas. It separates problem, assumption, solution, and evidence. The result is captured as a Completed Experiment Canvas and a Success Metric. |
Complexitydifferent | Medium | Medium | Low | Low |
Timedifferent | 30-180 min | 1-5 Tage | 20-35 min | 30-60 min |
Participantsdifferent | 1-6 | Nutzertraffic | 1-5 | 1-5 |
Formatdifferent | Workshop + async | Async | Workshop + async | Workshop + async |
Outputdifferent | Fault Isolation Map, Test Log, Excluded Hypotheses, Narrowed Fault Area | Click Data, Interest Signal, Learning Decision | Test Card with a pre-set threshold | Completed Experiment Canvas, Success Metric |
Tagsno overlap | TroubleshootingDiagnosisEngineering | ValidationExperimentsDemandDiscovery | ExperimentsValidationDiscoveryHypothesis | ExperimentsValidationDiscoveryHypothesis |