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| Criterion |  Architecture Architecture Decision Record |  Operations Fault Tree Analysis |  Operations Causal Factor Analysis |
|---|---|---|---|
Purposedifferent | 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 critical top event with several possible triggers, the method logically models failure paths. It makes visible which combinations of conditions can lead to damage. | For an event with a complicated course, the method breaks down the contributing factors along the timeline. It shows how conditions, decisions, and reactions together produce a course of events. |
Complexitydifferent | Low | High | High |
Timedifferent | 15-45 min | 2-6 h | 2-6 h |
Participantsdifferent | 1-3 | 3-8 | 3-10 |
Formatdifferent | Async | Workshop + async | Workshop + async |
Outputdifferent | ADR File, Decision Log, Rationale | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Event Timeline, Causal Factor Chart, Cause List, Corrective Actions |
Tagsno overlap | ArchitectureRationaleDocumentationGovernance | RiskRoot causeSafety | CausalityIncidentRoot causeTimeline |
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