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| Criterion |  Operations Fault Tree Analysis |  Architecture C4 Model |  Architecture arc42 |  Operations Barrier Analysis |
|---|---|---|---|---|
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. | 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. | arc42 structures architecture knowledge so teams can document system, decisions, and risks consistently. The template builds a living understanding of the architecture instead of scattered notes. | 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 | High | Low | Low | Medium |
Timedifferent | 2-6 h | 1-4 h | 1-2 Tage | 2-4 h |
Participantsdifferent | 3-8 | 1-5 | 1-4 | 2-6 |
Formatsame | Workshop + async | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Context Diagram, Container Diagram, Component Diagram | Architecture Document, Context View, Runtime View, Deployment View | Barrier Inventory, Failure Analysis per Barrier, Action Backlog |
Tagsno overlap | RiskRoot causeSafety | ArchitectureCommunicationVisualization | ArchitectureDocumentationCommunication | Root causeSafetyIncident |