Working With Model Items and Diagrams > Working with diagrams > Diagram types > Concurrency diagram
  
Concurrency diagram
For information about Concurrency Modeling in Modeler, see Concurrency modeling overview.
A Concurrency Diagram provides a view of the Concurrency Model. A Concurrency Diagram allows you to quickly create items in the Concurrency Model, and define relationships between those items.
You can create a Concurrency Diagram through the context menu of a Package: right-click the Package, point to New, point to Proprietary, point to Concurrency, and then click Concurrency Diagram.
The following sections provide information about how a Concurrency Diagram is used in the model. For more information about an item, property or model part, click it.
Shows these dictionary items
Like most diagrams, a Concurrency Diagram can show variability items and relationships. Overview of variability items and relationships on diagrams
For most diagram symbols, you can change the presentation of the symbol through the Style view options ( Style view options - all diagrams), and change the showing of Stereotypes and Tag Definitions through the Stereotypes view options (See Stereotypes view options for a symbol - all diagrams). When a symbol has additional view options for changing its presentation, this icon is shown - to see how the view options can change the presentation, click the icon.
Attribute (through owning instance's type)
Channel
Class (as type of instance)
Comment
Constraint
Data Type (as type of instance)
Dependency
Event (instance of)
Event Flag
Interface (as type of instance)
Interface Device
Mailbox
Monitor
Operation (instance of)
Pool
Semaphore
Signal (as type of instance)
Synchronizer
Task
These items (which are not documented in the reference topics) can also appear on a Concurrency Diagram:
• Frame Box - provides a way of adding a box or background image to the diagram.
• Link - links items on the diagram. After adding a link, you can add an Event (Event Message) or Operation (Operation Message) to the link.
• Note - provides a way of adding text to the diagram.
• Note Link - links a Constraint, Comment or Note to an item on the diagram.
Properties
A Concurrency Diagram has these properties:
• Description
• Full Name
• Last Changed By
• Last Changed On
• Name
• Page Reference
• Type
• Visibility
Owned by
Model
Package
Used in these parts of the model
Concurrency Model
Can be linked to these dictionary items
Stereotype
* 
Like other diagrams in a Model, a Concurrency Diagram can be linked to an Activity Partition, Comment, Frame Box, General Node, General Flow, General Flow Diagram Node, Constraint (applied), General Flow Diagram Flow or Swimlane.