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Selected:ARID (Active Reviews for Intermediate Designs)Fault Tree AnalysisRiskiest Assumption TestAssumption Surfacing
| Criterion |  Architecture ARID (Active Reviews for Intermediate Designs) |  Operations Fault Tree Analysis |  Product Discovery Riskiest Assumption Test |  Decision Making Assumption Surfacing |
|---|---|---|---|---|
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. | For a critical top event with several possible triggers, the method logically models failure paths. It makes visible which combinations of conditions can lead to damage. | 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. | Plans often contain assumptions that were never openly stated and remain dangerous precisely because of that. Assumption Surfacing makes these silent premises visible and prioritizes which of them carry the initiative or could sink it. |
Complexitydifferent | Medium | High | Medium | Low |
Timedifferent | 2–4 h review as a planning range; preparation and evaluation additional | 2-6 h | 1-2 Wochen pro Iteration | 45-90 min |
Participantsdifferent | Designers, developers as users, and facilitation | 3-8 | 2-6 | 2-8 |
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 | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Prioritized Assumption List, Test Plan, Results Report | Assumption List, Critical Assumptions, Learning Plan |
Tagsno overlap | ArchitectureEngineeringFeedbackValidationTasks | RiskRoot causeSafety | ExperimentsValidationDiscoveryAssumptions | AssumptionsRiskDecisionDiscovery |