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| Criterion |  Operations A3 Problem Solving |  Architecture ARID (Active Reviews for Intermediate Designs) |  Product Discovery MVP Test Matrix |
|---|---|---|---|
Purposedifferent | For a complex deviation with several people involved, the method bundles problem, analysis, and decision onto one page. It creates a shared working space where causes, countermeasures, and follow-up fit together. | 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 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. |
Complexitysame | Medium | Medium | Medium |
Timedifferent | 45-90 min | 2–4 h review as a planning range; preparation and evaluation additional | 45-75 min |
Participantsdifferent | 2-5 | Designers, developers as users, and facilitation | 2-8 |
Formatdifferent | Workshop + async | Workshop + async | Workshop |
Outputdifferent | A3 Report, Action Plan, Root Cause Analysis | Prioritized development tasks, Jointly produced code or pseudocode, Observed difficulties and open design questions, Proposed design revisions | Test Matrix, Test Plan |
Tagsno overlap | LeanProblem solvingCoachingOperations | ArchitectureEngineeringFeedbackValidationTasks | ExperimentsValidationDiscoveryOptions |
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