Mastering the C4 Model

A hands-on, plain-English guide to drawing software architecture that people actually understand — built around the C4 model created by Simon Brown.

This guide is written for developers, engineering managers, and product owners. You don't need a background in formal modelling notations like UML. If you can read a map, you can read a C4 diagram.

We'll build it up one level at a time:

1. The Problem with "Boxes and Arrows" — Why most architecture diagrams fail, and what C4 does differently.
2. The "Google Maps" Analogy — The mental model that makes everything click.
3. Level 1: System Context Diagram — The 30,000-foot view.
4. Level 2: Container Diagram — Your high-level technology choices.
5. Level 3: Component Diagram — Peeking inside a container.
6. Level 4: Code Diagram — The nitty-gritty (and why it's usually skipped).
7. Beyond the Four Levels: Supporting Diagrams — Landscape, Dynamic, and Deployment.
8. Tooling the C4 Model — Why drawing tools fail and "Architecture as Code" wins.
9. Conclusion & Next Steps — How your team can start tomorrow.

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New here? Start with The Problem with "Boxes and Arrows" and read straight through, or jump to any section above.

Begin: The Problem with "Boxes and Arrows" →