The view models is a method to describe the architecture from different views. According to this model, you can describe the architecture in these perspectives, to gain a quite good completeness of documentation.

However, this is not a 100% must. More often is that architecture is described with fewer views. Maybe only one view.

The methodology also help the designer to *think* of what he or she designs. To separate the concerns on what being described.

Viewpoints and Perspectives

4+1 View Models is very close to the concept of Perspectives and Viewpoints. But not to confuse with it. In this concept, a view is an instance from a viewpoint. A Perspective is a set of views from possibly several viewpoints. A perspective might be “Security” or “Avaiability”.

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