To provide a basis for understanding the process organization of the system, an architectural view called the process view is used in the Analysis & Design workflow. There is only one process view of the system, which illustrates the process decomposition of the system, including the mapping of classes and subsystems onto processes and threads. The process view is refined during each iteration.

The process view shows the process organization of the system.

There are four additional views, the Use-Case View (handled in the Requirements workflow), and the Logical View, Deployment View, and Implementation View; these views are handled in the Analysis & Design, and Implementation workflows.

The architectural views are documented in a Software Architecture Document. You may add different views, such as a security view, to convey other specific aspects of the software architecture.

So in essence, architectural views can be seen as abstractions or simplifications of the models built, in which you make important characteristics more visible by leaving the details aside. The architecture is an important means for increasing the quality of any model built during system development.

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Rational Unified Process