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| Criterion |  Product Discovery Solution Interview |  Engineering Fault Isolation |  Engineering Hypothesis-Driven Troubleshooting |  UX Research Usability Testing |
|---|---|---|---|---|
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 a product is built but people get stuck on tasks, usability testing shows the friction at concrete points. Observed use instead of self-report makes visible where orientation, understanding, or interaction breaks down. |
Complexitysame | Medium | Medium | Medium | Medium |
Timedifferent | 30-60 min je Interview | 30-180 min | 30-240 min | 1-2 h je Session |
Participantsdifferent | 5-10 Interviews | 1-6 | 1-6 | Based on research question |
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 | Usability Issues, Severity List, Recommendations |
Tagsno overlap | ValidationInterviewsPrototype | TroubleshootingDiagnosisEngineering | TroubleshootingProblem solvingDiagnosis | ValidationUXPrototype |