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| Criterion |  Architecture arc42 |  Operations Causal Factor Analysis |  Architecture C4 Model |  Operations Barrier Analysis |
|---|---|---|---|---|
Purposedifferent | 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 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. | 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 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 | Low | High | Low | Medium |
Timedifferent | 1-2 Tage | 2-6 h | 1-4 h | 2-4 h |
Participantsdifferent | 1-4 | 3-10 | 1-5 | 2-6 |
Formatsame | Workshop + async | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Architecture Document, Context View, Runtime View, Deployment View | Event Timeline, Causal Factor Chart, Cause List, Corrective Actions | Context Diagram, Container Diagram, Component Diagram | Barrier Inventory, Failure Analysis per Barrier, Action Backlog |
Tagsno overlap | ArchitectureDocumentationCommunication | CausalityIncidentRoot causeTimeline | ArchitectureCommunicationVisualization | Root causeSafetyIncident |