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Selected:Fault IsolationLean StartupA3 Problem SolvingARID (Active Reviews for Intermediate Designs)
| Criterion |  Engineering Fault Isolation |  Innovation Lean Startup |  Operations A3 Problem Solving |  Architecture ARID (Active Reviews for Intermediate Designs) |
|---|---|---|---|---|
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. | 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. | 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. |
Complexitysame | Medium | Medium | Medium | Medium |
Timedifferent | 30-180 min | Wochen bis Monate je Lernzyklus | 45-90 min | 2–4 h review as a planning range; preparation and evaluation additional |
Participantsdifferent | 1-6 | 2-8 | 2-5 | Designers, developers as users, and facilitation |
Formatsame | Workshop + async | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Fault Isolation Map, Test Log, Excluded Hypotheses, Narrowed Fault Area | Hypothesis list, MVPs, Learning reports, Pivot or persevere decision | A3 Report, Action Plan, Root Cause Analysis | Prioritized development tasks, Jointly produced code or pseudocode, Observed difficulties and open design questions, Proposed design revisions |
Tagsno overlap | TroubleshootingDiagnosisEngineering | LeanStartupValidationMVP | LeanProblem solvingCoachingOperations | ArchitectureEngineeringFeedbackValidationTasks |