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| Criterion |  Engineering Fault Isolation |  Architecture ARID (Active Reviews for Intermediate Designs) |  Product Discovery Learning 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. | ARID examines how well developers can work with a technical design. It focuses on a part of the system that can still be revised, between the architecture overview and the detailed specification. | The Learning Card connects traceable test results to a reasoned next action while keeping the limits of the insight visible. | 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 | Medium | Low | Medium |
Timedifferent | 30-180 min | 2–4 h review as a planning range; preparation and evaluation additional | 25-40 min | 45-75 min |
Participantsdifferent | 1-6 | Designers, developers as users, and facilitation | 1-5 | 2-8 |
Formatdifferent | Workshop + async | Workshop + async | Workshop + async | Workshop |
Outputdifferent | Fault Isolation Map, Test Log, Excluded Hypotheses, Narrowed Fault Area | Prioritized development tasks, Jointly produced code or pseudocode, Observed difficulties and open design questions, Proposed design revisions | Learning Card with evidence and next action | Test Matrix, Test Plan |
Tagsno overlap | TroubleshootingDiagnosisEngineering | ArchitectureEngineeringFeedbackValidationTasks | ExperimentsValidationDiscoveryLearning | ExperimentsValidationDiscoveryOptions |