| Main Description |
You may want to consider the following views (not all views are relevant to all systems or all the stakeholders). This
set of views is known as the 4+1 Views of Software Architecture [KRU95].
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Use-case view: Describes functionality of the system, its external interfaces, and its
principal users. This view is mandatory when using the 4+1 Views, because all elements of the architecture
should be derived from requirements.
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Logical view: Describes how the system is structured in terms of units of implementation. The
elements are packages, classes, and interfaces. The relationship between elements shows dependencies, interface
realizations, part-whole relationships, and so forth. Note: This view is mandatory when using the 4+1 Views of
Software Architecture.
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Implementation view: Describes how development artifacts are organized in the file system. The
elements are files and directories (any configuration items). This includes development artifacts and
deployment artifacts. This view is optional when using the 4+1 Views.
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Process view: Describes how the run-time system is structured as a set of elements that have
run-time behavior and interactions. Run-time structure often bears little resemblance to the code structure. It
consists of rapidly changing networks of communication objects. The elements are components that have run-time
presence (processes, threads, Enterprise JavaBeans™ (EJB™), servlets, DLLs, and so on), data stores, and
complex connectors, such as queues. Interaction between elements varies, based on technology. This view is
useful for thinking about run-time system quality attributes, such as performance and reliability. This view is
optional when using the 4+1 Views.
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Deployment view: Describe how the system is mapped to the hardware. This view is optional when
using the 4+1 Views.
In addition, you may wish to represent the following,
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