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| Criterion |  Product Discovery Solution Interview |  Engineering Fault Isolation |  Engineering Hypothesis-Driven Troubleshooting |  Product Discovery Problem Interview |
|---|---|---|---|---|
Purposedifferent | When a solution idea is already on the table, it checks how it is understood and evaluated. It looks for resonance, objections, and missing fit early in the conversation. | 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 systems fail unexpectedly, spontaneous attempts often produce more noise than insight. Hypothesis-driven Troubleshooting translates symptoms into testable assumptions and makes troubleshooting learnable. | 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. |
Complexitysame | Medium | Medium | Medium | Medium |
Timedifferent | 30-60 min je Interview | 30-180 min | 30-240 min | 30-60 min je Interview |
Participantsdifferent | 5-10 Interviews | 1-6 | 1-6 | 5-12 Interviews |
Formatsame | Workshop + async | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Solution Feedback, Objection List, Validation Notes | Fault Isolation Map, Test Log, Excluded Hypotheses, Narrowed Fault Area | Hypothesis Log, Test Plan, Evidence Notes, Diagnosis Summary | Problem Evidence, Risk Notes, Customer Segments |
Tagsno overlap | ValidationInterviewsPrototype | TroubleshootingDiagnosisEngineering | TroubleshootingProblem solvingDiagnosis | DiscoveryInterviewsValidation |