They are very similar to flowchart diagrams except that concurrency may be modeled in Activity diagrams. Deployment view - Encompass the nodes that form the system's hardware topology on which the system executes Each of the five views is a projection into the organization and structure of the system, focused on a particular aspect of that system. Each of these five views can stand alone so that different stakeholders can focus on the issues of the system's architecture that most concern them. The five views also interact with each other. For example, nodes in the deployment view hold components in the implementation view that, in turn, represent the physical realization of classes, interfaces, collaborations, and active classes from the design and process views.
Beta testing is performed, performance tuning, product packaging, etc.