Packages
The idea of a package can be applied to any model element, not just classes. Without some heuristics to group classes together, the grouping becomes arbitrary. The one I have found most useful and the one stressed most in the UML is the dependency.
I use the term package diagram for a diagram that shows packages of classes and the dependencies among them. Strictly speaking, a package diagram is just a class diagram that shows only packages and dependencies. I use these diagrams quite a lot, so I name them package diagrams, but you should remember that that is my term, not an official UML diagram name.
A dependency exists between two elements if changes to the definition of one element may cause changes to the other. With classes, dependencies ...
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