Activity diagrams are graphical representations of workflows of stepwise activities and actions within the system.
Activity diagrams are constructed from a limited number of shapes, connected with arrows. The most important shape types:
- rounded rectangles represent actions,
- diamonds represent decisions,
- bars represent the start (split) or end (join) of concurrent activities,
- a black circle represents the start (initial state) of the workflow,
- an encircled black circle represents the end (final state).
Arrows run from the start towards the end and represent the order in which activities happen.
Activity diagrams may be regarded as a form of flowchart. The following shapes are used in an Activity Diagram:
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Task1: Create an activity diagram for an auction website. (e.g. eBay)
Task 2: Create an activity diagram for a social network. (e.g. Facebook)
Task 3: Create an activity diagram for a game of Pacman.