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Selected:A3 Problem SolvingLean StartupFault IsolationARID (Active Reviews for Intermediate Designs)
| Criterion |  Operations A3 Problem Solving |  Innovation Lean Startup |  Engineering Fault Isolation |  Architecture ARID (Active Reviews for Intermediate Designs) |
|---|---|---|---|---|
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. | For uncertain business assumptions, the method forces the idea into contact with real market reactions early. It separates wishful picture, assumption, and observable behavior, so that learning becomes faster than planning. This translates uncertainty into measurable insight. | 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. |
Complexitysame | Medium | Medium | Medium | Medium |
Timedifferent | 45-90 min | Wochen bis Monate je Lernzyklus | 30-180 min | 2–4 h review as a planning range; preparation and evaluation additional |
Participantsdifferent | 2-5 | 2-8 | 1-6 | Designers, developers as users, and facilitation |
Formatsame | Workshop + async | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | A3 Report, Action Plan, Root Cause Analysis | Hypothesis list, MVPs, Learning reports, Pivot or persevere decision | 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 |
Tagsno overlap | LeanProblem solvingCoachingOperations | LeanStartupValidationMVP | TroubleshootingDiagnosisEngineering | ArchitectureEngineeringFeedbackValidationTasks |