Activity (UML)


An activity in Unified Modeling Language is a major task that must take place in order to fulfill an operation contract. The defines an activity as a sequence of activities that make up a process. Activities can be represented in activity diagrams
An activity can represent:
Activities can be decomposed into subactivities, until at the bottom we find atomic actions.
The underlying conception of an activity has changed between UML 1.5 and UML 2.0. In UML 2.0 an activity is no longer based on the state-chart rather it is based on a Petri net like coordination mechanism. There the activity represents user-defined behavior coordinating actions. Actions in turn are pre-defined.