The C4 model, introduced by software architect Simon Brown in 2011, provides a standardized approach for visualizing software architecture. It addresses the common issue of inconsistent diagramming by offering a hierarchical structure that allows teams to view systems at varying levels of detail.
The methodology consists of four levels: Context, which outlines the system and its users; Container, which details applications and data stores; Component, which breaks down internal modules; and Code, which describes implementation details. Teams are not required to use all levels, selecting only those necessary for their specific needs.
Practical implementation can be achieved through tools like Draw.io for visual editing or Structurizr for code-based diagramming. Structurizr allows for the definition of elements such as persons, software systems, and containers, with custom tags and styles used to differentiate visual representations like databases or message brokers.
The guide emphasizes that the Code level is often optional and can be redundant due to frequent changes in source code. It suggests that while manual diagrams are useful for high-level architecture, lower-level code structures are better managed through automated IDE tools or standard UML representations.
