c4 model

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      The C4 model is a lean graphical notation technique for modeling the architecture of software systems. It is based on a structural decomposition (a hierarchical tree structure) of a system into containers and components and relies on existing modelling techniques such as Unified Modeling Language (UML) or entity–relationship diagrams (ERDs) for the more detailed decomposition of the architectural building blocks.


      History


      The C4 model was created by the software architect Simon Brown between 2006 and 2011 on the roots of Unified Modelling Language (UML) and the 4+1 architectural view model. The launch of an official website under a Creative Commons license and an article published in 2018 popularised the emerging technique.


      Overview


      The C4 model documents the architecture of a software system, by showing multiple points of view that explain the decomposition of a system into containers and components, the relationship between these elements, and, where appropriate, the relation with its users.
      The viewpoints are organized according to their hierarchical level:

      Context diagrams (level 1): show the system in scope and its relationship with users and other systems;
      Container diagrams (level 2): decompose a system into interrelated containers. A container represents an application or a data store;
      Component diagrams (level 3): decompose containers into interrelated components, and relate the components to other containers or other systems;
      Code diagrams (level 4): provide additional details about the design of the architectural elements that can be mapped to code. The C4 model relies at this level on existing notations such as Unified Modelling Language (UML), Entity Relation Diagrams (ERD) or diagrams generated by Integrated Development Environments (IDE).
      For level 1 to 3, the C4 model uses 5 basic diagramming elements: persons, software systems, containers, components and relationships. The technique is not prescriptive for the layout, shape, colour and style of these elements. Instead, the C4 model recommends using simple diagrams based on nested boxes in order to facilitate interactive collaborative drawing. The technique also promotes good modelling practices such as providing a title and legend on every diagram, and clear unambiguous labelling in order to facilitate the understanding by the intended audience.
      The C4 model facilitates collaborative visual architecting and evolutionary architecture in the context of agile teams where more formal documentation methods and up-front architectural design are not desired.


      See also


      Software architecture


      References




      External links


      Official site

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    c4 model

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    Home | C4 model

    The C4 model is: A set of hierarchical abstractions (software systems, containers, components, and code). A set of hierarchical diagrams (system context, containers, components, and code).

    Diagrams | C4 model

    The C4 model is named after the core set of static structure diagrams: (system) context, containers, components, and code.

    Introduction - C4 model

    The C4 model was created as a way to help software development teams describe and communicate software architecture, both during up-front design sessions and when retrospectively documenting an existing codebase.

    Example | C4 model

    Mar 22, 2023 · The C4 model for visualising software architecture. Example . Hover your mouse over the diagram below, find elements with a and double-click to zoom-in.

    Dynamic diagram | C4 model

    The C4 model for visualising software architecture. Dynamic diagram . A dynamic diagram can be useful when you want to show how elements in the static model collaborate at runtime to implement a user story, use case, feature, etc.

    Component | C4 model

    The C4 model is about showing the runtime units (containers) and how functionality is partitioned across them (components), rather than organisational units such as Java JAR files, C# assemblies, DLLs, modules, packages, namespaces or folder structures.

    FAQ | C4 model

    If not, try the C4 model. And don’t be afraid to supplement the C4 diagrams with UML state diagrams, timing diagrams, etc if you need to. Can we combine C4 and arc42? Yes, many teams do, and the C4 model is compatible with the arc42 documentation template as follows. Context and Scope => System Context diagram

    Abstractions | C4 model

    The C4 model is an “abstraction-first” approach to diagramming software architecture, based upon abstractions that reflect how software architects and developers think about and build software. The small set of abstractions and diagram types makes the C4 model easy to learn and use.

    System context diagram | C4 model

    The C4 model for visualising software architecture. System context diagram . A System Context diagram is a good starting point for diagramming and documenting a software system, allowing you to step back and see the big picture.

    Code diagram | C4 model

    The C4 model for visualising software architecture. Code diagram . Finally, you can zoom in to each component to show how it is implemented as code; using UML class diagrams, entity relationship diagrams or similar.