Activity diagrams

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• Activity diagrams show the activities of a particular operation in the system. The activity diagram consists of an initial mode; point from where the activity begins, activities involved and an activity final mode; point where the activities end.
• Activity diagrams describe the complete flow of the system and help to take actions. Fork and Join are two very important concepts of the system. When one activity is split into sub activities it shows a Fork. When two or more activities join to form one activity it is called as a JOIN. Similar to flow charts, Activity diagrams can also have a decision box (Diamond).
• E.g. An activity of an employee updating a task. Here, the initial mode is Receive task. Receive task can be split into Fill task and Update task (FORK). Update task can be split into Update task weekly and update task monthly. These two tasks can JOIN to an activity Submit task. Here, Submit task is the Final mode.