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Selected:Fault IsolationARID (Active Reviews for Intermediate Designs)Assumption MappingRiskiest Assumption Test
| Criterion |  Engineering Fault Isolation |  Architecture ARID (Active Reviews for Intermediate Designs) |  Product Discovery Assumption Mapping |  Product Discovery Riskiest Assumption Test |
|---|---|---|---|---|
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. | When assumptions still sit unordered in the room, it weighs uncertainty against leverage. It makes visible which hypotheses should be checked first. | When an idea hinges on one critical unknown, it prioritizes testing that exact piece of uncertainty first. It separates problem, assumption, solution, and evidence. The result is captured as a prioritized list of assumptions, a test plan, and a result report. |
Complexitysame | Medium | Medium | Medium | Medium |
Timedifferent | 30-180 min | 2–4 h review as a planning range; preparation and evaluation additional | 45-60 min | 1-2 Wochen pro Iteration |
Participantsdifferent | 1-6 | Designers, developers as users, and facilitation | 2-8 | 2-6 |
Formatsame | Workshop + async | Workshop + async | Workshop + async | Workshop + async |
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 | Assumption map, Test backlog, Risk ranking | Prioritized Assumption List, Test Plan, Results Report |
Tagsno overlap | TroubleshootingDiagnosisEngineering | ArchitectureEngineeringFeedbackValidationTasks | AssumptionsRiskExperimentsValidation | ExperimentsValidationDiscoveryAssumptions |