UML - Activity Diagrams. Activity diagram is another important diagram in UML to describe the dynamic aspects of the system. Activity diagram is basically a flowchart to represent the flow from one activity to another activity. The activity can be described as an operation of the system. Activity Diagrams. Activity diagram is UML behavior diagram which shows flow of control or object flow with emphasis on the sequence and conditions of the flow. The following nodes and edges are typically drawn on UML activity diagrams: activity, partition, action, object, control, activity edge. Activity diagrams are graphical representations of workflows of stepwise activities and actions be interpreted differently in UML 2.x. UML activity diagrams in version 2.x can be used in various domains, e.g. in design of embedded systems.‎Construction · ‎References.


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Depending on the condition either the Overnight Delivery activity or the Regular Delivery activity is performed. Finally the parallel activities combine to close the order.

UML - Activity Diagrams

The activity diagram example below visualize the flow in graphical form. An applicant wants activity diagram uml enroll in the university. Final Node There are two types of final node: The activity final node is depicted as a circle with a dot inside.

Activity diagram uml flow final node is depicted as a circle with a cross inside. The difference between the two node types is that the flow final node denotes the end of a single control flow; the activity final node denotes the end of all control flows within the activity.


Objects and Object Flows An object flow is a path along which objects or data can pass. An object is shown as a rectangle.

An object flow is shown as a connector with an arrowhead activity diagram uml the direction activity diagram uml object is being passed. AgileModeling UML 2 activity diagrams are typically used for business process modeling, for modeling the logic captured by a single use case or usage scenario, or for modeling the detailed logic of a business rule.

Activity Diagram - UML 2 Tutorial | Sparx Systems

Although UML activity diagrams could potentially model the activity diagram uml logic of a complex operation it would be far better activity diagram uml simply rewrite the operation so that it is simple enough that you don't require an activity diagram.

In many ways UML activity diagrams are the object-oriented equivalent of flow charts and data flow diagrams DFDs from structured development.


Let's start by describing the basic notation there's more that I've used in Figures 1 and 2: The filled in circle is the starting point of the diagram. An initial node isn't required although it does make it significantly easier to activity diagram uml the diagram.

The filled circle with a border is the ending point.


An activity diagram can have zero or more activity final nodes. The rounded rectangles represent activities that occur. The arrows on the diagram.

Activity Diagrams

Although there is a subtle difference between flows activity diagram uml edges I have never seen a practical purpose for the difference although I have no doubt one exists. I'll use the term flow. A black bar with one flow going into it and several activity diagram uml it.

It can have an external partition that does not represent one of the parts, but a completely separate classifier. In business modeling, external partitions can be used to model entities outside a business.

Activity diagram

Buy action occurs in external partition Customer In the situations when swimlanes can't be used to show partitions, alternate text notation with qualified action name could be used instead. In this case partition name is placed in parenthesis above the action name. A comma-delimited list of partition names means that the node is contained in more than one partition.

A double colon within a partition name activity diagram uml that the partition is nested, with the larger partitions coming earlier in activity diagram uml name.

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  • UML - Activity Diagrams

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