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| Criterion |  Architecture Architecture Decision Record |  Operations Fault Tree Analysis |  Architecture C4 Model |  Operations Failure Mode and Effects 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. | The C4 Model makes a system legible across several resolution levels, from context down to code. It suits situations where different audiences need to understand the same architecture from different altitudes. | For a process, product, or service with noticeable failure risks, the method assesses possible failure modes in advance. It directs attention to combinations of occurrence, effect, and detectability. |
Complexitydifferent | Low | High | Low | High |
Timedifferent | 15-45 min | 2-6 h | 1-4 h | 2-6 h |
Participantsdifferent | 1-3 | 3-8 | 1-5 | 3-10 |
Formatdifferent | Async | Workshop + async | Workshop + async | Workshop |
Outputdifferent | ADR File, Decision Log, Rationale | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Context Diagram, Container Diagram, Component Diagram | FMEA Table, Risk Priority, Mitigation Actions |
Tagsno overlap | ArchitectureRationaleDocumentationGovernance | RiskRoot causeSafety | ArchitectureCommunicationVisualization | RiskQualityOperationsRoot cause |