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| Criterion |  Engineering Fault Isolation |  Product Discovery Problem Interview |  Product Discovery Experiment Canvas |  Product Discovery Test Card |
|---|---|---|---|---|
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 the picture of the problem still needs to become solid, it asks about real situations and consequences. It separates genuine suffering from mere interest in a solution. | 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. | The Test Card turns a critical assumption into a testable claim and specifies in advance which result counts as success. |
Complexitydifferent | Medium | Medium | Low | Low |
Timedifferent | 30-180 min | 30-60 min je Interview | 30-60 min | 20-35 min |
Participantsdifferent | 1-6 | 5-12 Interviews | 1-5 | 1-5 |
Formatsame | Workshop + async | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Fault Isolation Map, Test Log, Excluded Hypotheses, Narrowed Fault Area | Problem Evidence, Risk Notes, Customer Segments | Completed Experiment Canvas, Success Metric | Test Card with a pre-set threshold |
Tagsno overlap | TroubleshootingDiagnosisEngineering | DiscoveryInterviewsValidation | ExperimentsValidationDiscoveryHypothesis | ExperimentsValidationDiscoveryHypothesis |