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| Criterion |  Operations RACI Matrix |  Architecture C4 Model |  Architecture Architecture Decision Record |  Decision Making DACI |
|---|---|---|---|---|
Purposedifferent | With unclear responsibilities across several roles or areas, the method creates unambiguous accountability logic. It reduces friction because decision, execution, contribution, and information become separately visible. | 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. | 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. | In cross-functional decisions, responsibilities quickly blur between approval, influence, and execution. DACI arranges these roles so decision pressure, contribution, and information stay cleanly separated. |
Complexitysame | Low | Low | Low | Low |
Timedifferent | 45-90 min | 1-4 h | 15-45 min | 30-60 min |
Participantsdifferent | 2-8 | 1-5 | 1-3 | 2-10 |
Formatdifferent | Workshop + async | Workshop + async | Async | Workshop + async |
Outputdifferent | RACI Matrix, Responsibility Map, Decision Notes | Context Diagram, Container Diagram, Component Diagram | ADR File, Decision Log, Rationale | DACI Matrix, Decision Owner, Decision Log |
Tagsno overlap | RolesResponsibilityGovernanceOperations | ArchitectureCommunicationVisualization | ArchitectureRationaleDocumentationGovernance | DecisionRolesGovernanceAlignment |