Class diagrams can be used to model hi-level architecture with packages, interfaces and dependencies. Packages are used to group together a set of model elements for various purposes. The results may show:

	Subsystems - the design view of a software component or re-useable part of a component.
	Libraries of re-useable elements, usually classes.
	The hierarchic structure and layering of the system
	Client-server relationships between components and other model elements
	Logical dependencies of sub-systems and libraries on one another