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| Criterion |  Engineering Fault Isolation |  Product Discovery Assumption Mapping |  Product Discovery Test Card |  Decision Making Assumption Surfacing |
|---|---|---|---|---|
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 assumptions still sit unordered in the room, it weighs uncertainty against leverage. It makes visible which hypotheses should be checked first. | The Test Card turns a critical assumption into a testable claim and specifies in advance which result counts as success. | 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. |
Complexitydifferent | Medium | Medium | Low | Low |
Timedifferent | 30-180 min | 45-60 min | 20-35 min | 45-90 min |
Participantsdifferent | 1-6 | 2-8 | 1-5 | 2-8 |
Formatsame | Workshop + async | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Fault Isolation Map, Test Log, Excluded Hypotheses, Narrowed Fault Area | Assumption map, Test backlog, Risk ranking | Test Card with a pre-set threshold | Assumption List, Critical Assumptions, Learning Plan |
Tagsno overlap | TroubleshootingDiagnosisEngineering | AssumptionsRiskExperimentsValidation | ExperimentsValidationDiscoveryHypothesis | AssumptionsRiskDecisionDiscovery |