Structured Activity

Structured Activity elements are used in Activity diagrams. A Structured Activity is an activity node that can have subordinate nodes as an independent Activity Group. You can set an option to ensure that no other Activities or their side effects interfere with this Activity's processing (the Must Isolate checkbox in the Structured Activity element Properties dialog).

Enterprise Architect provides a number of  forms of Structured Activity, both basic and specialized.

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Create Structured Activities

When you drag a Structured Activity icon from the Toolbox onto a diagram, a short menu displays from which you select one of the following options:

·Loop Node
·Conditional Node

The first two options specifically create a Loop Node or Conditional Node.

The Other option displays the New Structured Activity dialog, on which you can select to create one of five types of Structured Activity element.

Structured Activity Types



See Also

Simple Composite Activity

Generates a Composite Activity element with a child Activity diagram.


Composite Elements


Loop Node

Represents a sequence of Actions and Activities that are to be repeated within the object.


Loop Node

Conditional Node

Represents an arrangement of Actions and Activities where choice determines which Activities are performed.


Conditional Node

Structured Activity Node

Represents an ordered arrangement of executable Activity nodes (Actions, Decisions, Merges and so on) that can include branched and nested nodes; this is the base element from which the other types of Structured Activity are derived.


Structured Node

Sequential Node

Represents a sequential arrangement of executable Activity nodes.


Sequential Node


·To protect the processing of a Loop or Conditional Node Structured Activity from interference from other Activities or their side effects, open the element's Properties dialog and select the Must Isolate checkbox on the Loop or Condition tab

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