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| Criterion |  Operations Change Analysis |  Product Discovery Pretotyping |  Engineering Fault Isolation |  Product Discovery Fake Door Test |
|---|---|---|---|---|
Purposedifferent | For a deviation after a change, the method isolates the influence of the altered condition. It narrows down which differences are relevant and which are just accompanying noise. | Pretotyping clarifies whether a customer problem and solution idea create enough real demand. It separates problem, assumption, solution, and evidence, and captures the result as a pretotyping sketch, test setup, and conversion data. | 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. |
Complexitydifferent | Medium | Low | Medium | Medium |
Timedifferent | 45-120 min | Stunden bis wenige Tage | 30-180 min | 1-5 Tage |
Participantsdifferent | 2-6 | 1-4 | 1-6 | Nutzertraffic |
Formatdifferent | Workshop + async | Workshop + async | Workshop + async | Async |
Outputdifferent | Change Matrix, Cause Hypotheses, Validation Questions, Action List | Pretotyping sketch, Test setup, Conversion data, Go or no-go decision | Fault Isolation Map, Test Log, Excluded Hypotheses, Narrowed Fault Area | Click Data, Interest Signal, Learning Decision |
Tagsno overlap | ChangeRoot causeTroubleshootingComparison | ValidationDemandMVP | TroubleshootingDiagnosisEngineering | ValidationExperimentsDemandDiscovery |