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| Criterion |  Engineering Fault Isolation |  Product Discovery Learning Card |  Product Discovery Test Card |  Product Discovery MVP Test Matrix |
|---|---|---|---|---|
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. | The Learning Card connects traceable test results to a reasoned next action while keeping the limits of the insight visible. | The Test Card turns a critical assumption into a testable claim and specifies in advance which result counts as success. | 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. |
Complexitydifferent | Medium | Low | Low | Medium |
Timedifferent | 30-180 min | 25-40 min | 20-35 min | 45-75 min |
Participantsdifferent | 1-6 | 1-5 | 1-5 | 2-8 |
Formatdifferent | Workshop + async | Workshop + async | Workshop + async | Workshop |
Outputdifferent | Fault Isolation Map, Test Log, Excluded Hypotheses, Narrowed Fault Area | Learning Card with evidence and next action | Test Card with a pre-set threshold | Test Matrix, Test Plan |
Tagsno overlap | TroubleshootingDiagnosisEngineering | ExperimentsValidationDiscoveryLearning | ExperimentsValidationDiscoveryHypothesis | ExperimentsValidationDiscoveryOptions |