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| Criterion |  Engineering Hypothesis-Driven Troubleshooting |  Architecture Architecture Decision Record |  Operations Gemba Walk |  Engineering Fault Isolation |
|---|---|---|---|---|
Purposedifferent | When systems fail unexpectedly, spontaneous attempts often produce more noise than insight. Hypothesis-driven Troubleshooting translates symptoms into testable assumptions and makes troubleshooting learnable. | An ADR permanently records an architecture decision with context, trade-offs, and consequence. It creates continuity for later changes because the decision path stays traceable. | When there is uncertainty about the real course of a process, the method brings observation to the place where work happens. It combines perception, follow-up questions, and process knowledge so decisions rest on actual workflows instead of assumptions. | 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. |
Complexitydifferent | Medium | Low | Low | Medium |
Timedifferent | 30-240 min | 15-45 min | 30-120 min | 30-180 min |
Participantsdifferent | 1-6 | 1-3 | 2-6 | 1-6 |
Formatdifferent | Workshop + async | Async | Workshop | Workshop + async |
Outputdifferent | Hypothesis Log, Test Plan, Evidence Notes, Diagnosis Summary | ADR File, Decision Log, Rationale | Observation Notes, Improvement Ideas | Fault Isolation Map, Test Log, Excluded Hypotheses, Narrowed Fault Area |
Tagsno overlap | TroubleshootingProblem solvingDiagnosis | ArchitectureRationaleDocumentationGovernance | LeanObservationProcessOperations | TroubleshootingDiagnosisEngineering |