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| Criterion |  Engineering Failure Scenario Analysis |  Operations Fault Tree Analysis |  Architecture Architecture Decision Record |
|---|---|---|---|
Purposedifferent | In critical processes, it is not enough to plan only for the normal case. Failure Scenario Analysis looks at the path into failure and shows which failures, chains, and control gaps cause the most damage. | 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. | 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. |
Complexitydifferent | Medium | High | Low |
Timedifferent | 1-3 h | 2-6 h | 15-45 min |
Participantsdifferent | 3-8 | 3-8 | 1-3 |
Formatdifferent | Workshop | Workshop + async | Async |
Outputdifferent | Failure Scenarios, Risk Notes, Control Gaps, Test and Response Actions | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | ADR File, Decision Log, Rationale |
Tagsno overlap | FailureResilienceRisk | RiskRoot causeSafety | ArchitectureRationaleDocumentationGovernance |
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