Process Choreographies

Question 1

What is Choregraphy?

Answer 1

A process model of interactions taking place between two or more business parties.

Question 2

Features of choreography.

Answer 2

1. Focuses on message exchange between two parties.
2. Acts as a contract between parties.
3. Can be refined into:
   
   • private processes; or
   • a collaboration diagram.

Question 3

What are the basic elements of a choreography model?

Answer 3

• Sequence Flow
• Events (no non-interrupting events)
• Gateways.
• Text annotation groups

Question 4

What is a synchronous interaction?

Answer 4

A two-way interaction between parties.

Question 5

What is an asynchronous interaction?

Answer 5

A one-way interacton between parties.

Question 6

How are choreography tasks represented in BPMN 2.0>

Answer 6

• Box with rounded corners and two bands.
• Each interaction has an initiator and recipient.
• Shaded band represents the recipient.

Question 7

When can a precedence relation between two interactions be established?

Answer 7

• The initiator of the second interaction must be involved in the previous interacton.
• Exception is the first interaction.
• Does not apply where there is no order of precedence.

Question 8

What is a sub-choreography?

Answer 8

• A compound activity of a choreography.
• Involves two or more parties.

Question 9

What is the difference between collaboration and choreography?

Answer 9

• Collaboration: Conversations and interactions.
• Choreography: Tasks performed by participants and how participants coordinate activities via messages.