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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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    Home | C4 model

    Home | C4 model

    C4 model | Lightweight standard for visualizing software architecture

    C4 model | Lightweight standard for visualizing software architecture

    The C4 model for visualising software architecture

    The C4 model for visualising software architecture

    GitHub - CristianoRC/C4-Model: Palestra e conteúdos sobre C4 Model

    GitHub - CristianoRC/C4-Model: Palestra e conteúdos sobre C4 Model

    The C4 model | software-architecture-models

    The C4 model | software-architecture-models

    The C4 model | software-architecture-models

    The C4 model | software-architecture-models

    C4 model example | Lucidchart

    C4 model example | Lucidchart

    Online C4 Model Software

    Online C4 Model Software

    C4 3D Model_5ed3783ebb688.png - 3DHunt.co

    C4 3D Model_5ed3783ebb688.png - 3DHunt.co

    Introduction to the C4 Model for Visualizing Software Architecture ...

    Introduction to the C4 Model for Visualizing Software Architecture ...

    What Is the C4 Model for Visualizing Software Architecture? | Baeldung ...

    What Is the C4 Model for Visualizing Software Architecture? | Baeldung ...

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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).

    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.

    Diagrams | C4 model

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

    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.

    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.

    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.

    FAQ | C4 model

    Is the C4 model universally applicable? The C4 model was designed to help describe, document, and diagram custom-built, bespoke software systems. From this perspective, the C4 model can be used to describe a variety of software architectures (monolithic or distributed), built in a variety of programming languages, deployed on a variety of ...

    Component diagram | C4 model

    The C4 model for visualising software architecture. Component diagram . Next you can zoom in and decompose each container further to identify the major structural building blocks and their interactions.

    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.

    Tooling | C4 model

    With a modelling tool, you’re building up a non-visual model of your software architecture (a single definition of all elements and the relationships between them), and then creating different views (that become diagrams) on top of that model.