C4 Model (c4model.com)

• is a type of diagram for representing software systems

Sections

• core/static structure
• supplemental diagrams
• notation
• software/tooling

1 - C4 Model (Core/Static Structure)

The C4 model considers the static structures in terms of:

Level 1 - Context

contains a set of software-systems in which the target software-system communicates with

Level 2 - Containers

contains a set of Containers

Level 3 - Components

contains a set of Components

Level 4 - Code (UML or ERD)

a code diagram of a single Component utilizes either: Unified Modeling Language (UML) Diagram Entity-Relationship Model (ERM) - Entity-Relationship Diagram (ERD)

2 - C4 Model (Supplemental Diagrams) *Optional

System Landscape Diagram (Larger Context)

a bigger picture of “Context Diagram”

Dynamic Diagram

dynamic diagram can be useful when you want to show how elements in a static model collaborate at runtime to implement a user story, use case, feature, etc is based upon a UML communication diagram (previously known as a “UML collaboration diagram”). It is similar to a UML sequence diagram although it allows a free-form arrangement of diagram elements with numbered interactions to indicate ordering

Deployment Diagram

deployment diagram allows you to illustrate how software systems and/or containers in the static model are mapped to infrastructure. This deployment diagram is based upon a UML deployment diagram, although simplified slightly to show the mapping between containers and deployment nodes. A deployment node is something like physical infrastructure (e.g. a physical server or device), virtualized infrastructure (e.g. IaaS, PaaS, a virtual machine), containerized infrastructure (e.g. a Docker container), an execution environment (e.g. a database server, Java EE web/application server, Microsoft IIS), etc. Deployment nodes can be nested

3 - C4 Model (Notation/Syntax) *Optional

Icons Legend

Icon Description Format

4 - C4 Model (Software/Tooling) *Optional

• Structurizr
• Archi
• IcePanel
• Sparx Enterprise Architect
• Gaphor
• MooD
• Astah
• PlantUML
• diagrams.net
• OmniGraffle
• Microsoft Visio
• yED