If an action or object may located on the border of multiple partitions, is considered to be in multiple groups.Any actions and objects that are located within the two lines are considered to be in the group.It is drawn as two parallel lines with the partition name as one end.Partition presents a group of actions and objects that share some common properties.The Notify Customer send signal action in an order processing activity can be drawn as a Send Signal Notation in a UML activity diagram as shown below: It is drawn as a convex pentagon with its name placed inside. It ends itself and passes the execution control to the next action. The send signal action does not wait for any responses from the receiver of the signal. It represents a signal action that sends a signal to outside of the activity. This object can be drawn as an Object Notation in a UML activity diagram as shown below: Order object generated from the Fill Order action will be consumed by the Ship Order action. It can also be qualified by a state written within brackets below the name. It is represented by a rectangle with its name placed inside. An object in this case is considered as an instance of a class in a given state. It represents an object which could be an input and/or an output of an action. Join action performed before the Close Order action to wait for both Ship Order action and Send Invoice action to finish can be drawn as in the diagram as shown below: It is drawn as a short solid line with multiple incoming control flows on one side and one outgoing control flows on the other side. It represents a join action that waits for multiple concurrent execution flows to finish. The fork action performed after the Receive Order action to start Ship Order action and Send Invoice action concurrently can be drawn in the diagram as shown below: It is drawn as a short solid line with one incoming control flow on one side and multiple outgoing control flows on the other side. It represents a fork action that splits a single execution flow into multiple concurrent execution flows. The merge point where Ship Order and Hold Order meet can be drawn in the diagram as a Merge Notation as shown below: It is drawn as a small diamond shape with multiple incoming control flows and on outgoing control flow. It represents a merge point where multiple alternate execution paths will meet and continue. The decision action performed after the Receive Order action to check the stock can be drawn in the diagram as shown below: It represents a decision action that evaluates certain conditions and decides which action path to continue the execution.Ī Decision Notation is drawn as a small diamond shape with one incoming control flow and multiple outgoing control flows.Įach outgoing control flow should be labeled with the condition that leads to this flow. A Final element is drawn as a small solid circle enclosed in an outer circle. A Start element is drawn as a small solid circle.Start Notation and Final Notation are also called Initial State notation and Final State. They represent the starting point and the ending point of an action execution sequence within an activity. It is drawn as a solid line with a line-arrow at one end pointing to the next action.ĮxampleWhen the Fill Order action is ended, the execution control is transferred to the Ship Order action. that is not further decomposed within the activity.Īctivity represents a behavior that is composed of individual elements that are activity nodes which could be:Ī Control Flow represents a transfer of execution control from one action to another action. ActionsĪction is a named element which represents a single atomic step within activity i.e. In fact, according to the UML specification, an activity diagram is a variation of a state machine diagram. The activity diagram’s notation is also very similar to that of a state machine diagram. It is also referred to as an object-oriented flowchart. The basic purpose of an activity diagram is to capture the dynamic behavior of the system. An activity can be described as an operation of the system. Model in detail complex activities in a high level activity DiagramĪn activity diagram is basically a flowchart that represents the flow from one activity to another.Model complex workflows in operations on objects.Model workflows between/within use cases.Identify pre- and post-conditions (the context) for use cases.Identify candidate use cases, through the examination of business workflows.It also allows them to identify the constraints and conditions that trigger specific events. Developers use activity diagrams to understand the high-level flow of a program.
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