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| Criterion |  Operations Fault Tree Analysis |  Architecture Architecture Decision Record |  Architecture C4 Model |
|---|---|---|---|
Purposedifferent | 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. | 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. |
Complexitydifferent | High | Low | Low |
Timedifferent | 2-6 h | 15-45 min | 1-4 h |
Participantsdifferent | 3-8 | 1-3 | 1-5 |
Formatdifferent | Workshop + async | Async | Workshop + async |
Outputdifferent | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | ADR File, Decision Log, Rationale | Context Diagram, Container Diagram, Component Diagram |
Tagsno overlap | RiskRoot causeSafety | ArchitectureRationaleDocumentationGovernance | ArchitectureCommunicationVisualization |
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