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| Criterion |  Architecture ARID (Active Reviews for Intermediate Designs) |  Product Discovery Test Card |  Engineering Fault Isolation |  Product Discovery Learning Card |
|---|---|---|---|---|
Purposedifferent | 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 Test Card turns a critical assumption into a testable claim and specifies in advance which result counts as success. | 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. |
Complexitydifferent | Medium | Low | Medium | Low |
Timedifferent | 2–4 h review as a planning range; preparation and evaluation additional | 20-35 min | 30-180 min | 25-40 min |
Participantsdifferent | Designers, developers as users, and facilitation | 1-5 | 1-6 | 1-5 |
Formatsame | Workshop + async | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Prioritized development tasks, Jointly produced code or pseudocode, Observed difficulties and open design questions, Proposed design revisions | Test Card with a pre-set threshold | Fault Isolation Map, Test Log, Excluded Hypotheses, Narrowed Fault Area | Learning Card with evidence and next action |
Tagsno overlap | ArchitectureEngineeringFeedbackValidationTasks | ExperimentsValidationDiscoveryHypothesis | TroubleshootingDiagnosisEngineering | ExperimentsValidationDiscoveryLearning |