Concepts:  Use-Case View

To provide a basis for planning the technical contents of iterations, an architectural view called the use-case view is used. There is only one use-case view of the system, which illustrates the use cases and scenarios that encompass architecturally significant behavior, classes, or technical risks. The use-case view is refined and considered initially in each iteration.

The use-case view shows an architecturally significant subset of the use-case model, a subset of the use cases and actors.

The analysis, design, and implementation activities subsequent to requirements are centered on the notion of an architecture. The production and validation of that architecture is the main focus of the early iterations, especially during the Elaboration phase. Architecture is represented by a number of different architectural views, which in their essence are extracts illustrating the "architecturally significant" elements of the models.

The architectural views are documented in a Software Architecture Document.

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.