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| Criterion |  Engineering Failure Scenario Analysis |  Architecture Architecture Decision Record |  Operations Barrier Analysis |
|---|---|---|---|
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. | 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. | For a risk that can only be managed through multiple layers of protection, the method examines the effectiveness of each barrier. It shows where safeguards are missing, too weak, or fail under real conditions. |
Complexitydifferent | Medium | Low | Medium |
Timedifferent | 1-3 h | 15-45 min | 2-4 h |
Participantsdifferent | 3-8 | 1-3 | 2-6 |
Formatdifferent | Workshop | Async | Workshop + async |
Outputdifferent | Failure Scenarios, Risk Notes, Control Gaps, Test and Response Actions | ADR File, Decision Log, Rationale | Barrier Inventory, Failure Analysis per Barrier, Action Backlog |
Tagsno overlap | FailureResilienceRisk | ArchitectureRationaleDocumentationGovernance | Root causeSafetyIncident |
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