Choreography Diagrams (BPMN)

A choreography diagram is used to analyze how participants exchange information to coordinate their interactions. A choreography diagram can be used to expand and analyze in detail the exchange of messages associated with a conversation node in a conversation diagram.

In the following example, the exchange of messages between a patient and a doctor is analyzed:

The following tools are available in this diagram:

Tool	Description
...	Start Events - Initiate a process (see Events (BPMN)). The various types of start events each have their own tools.
...	End Events - Conclude a process (see Events (BPMN)). The various types of end events each have their own tools.
	Choreography Task - Interaction between two participants (see Choreography Tasks (BPMN)).
...	Gateways - Merge or split the sequence flow (see Gateways (BPMN)). The various types of gateways each have their own tools.
	Message - Message sent to the choreography task by a participant (see Messages (BPMN)). If your task has participants specified, you can click on the task symbol to create a message and message flow in one step.
	Message Flow - Links a message to a participant in the choreography task (see Flows and Links (BPMN)). The task must have participants defined before you can attach a message to it.
	Sequence Flow - Links two elements (events, activities, gateways) in a process (see Flows and Links (BPMN)).

• Associating a Conversation Node with a Choreography Diagram or Task
  You can associate a conversation node with a choreography diagram or with a choreography task in order to model the choreography of the messages that flow through it. Choreography diagrams and tasks associated with a conversation node are initialized with the participants linked to the node.