The Unified Modeling Language User Guide, 2nd Edition
by Grady Booch, James Rumbaugh, Ivar Jacobson
Glossary
abstract class A class that cannot be directly instantiated.
abstraction The essential characteristics of an entity that distinguish it from all other kinds of entities. An abstraction defines a boundary relative to the perspective of the viewer.
action An executable computation that results in a change in state of the system or the return of a value.
active class A class whose instances are active objects.
active object An object that owns a process or thread and can initiate control activity.
activity Behavior expressed as a set of actions connected by control and data flows.
activity diagram A diagram that shows the flow of control and data from activity to activity. Activity diagrams address the dynamic view of a system.
actor
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