There is few purpose of an activity diagram;
one is to model a task (modeling). Two,
it is used to describe a function of a system represented by a use case. It is also use to describe the logic of an
operation. And last but not least is to
model the activities that make up the life cycle in the Unified Process.
Activity diagrams have few notations
that may help us in modeling process. It
involves Actions, Control Flows, Initial Mode, Decision Mode, Guard conditions
and Final node. We also have fork nodes
and Actions Carried.
Below are the activity diagrams for our distance learning system:
