Business Process Modelling -10.2/2013 -

Business Process Modelling-10.2/2013 -

Marcello La Rosa

Queensland University of Technology

Brisbane, 26 September 2013

© INB/INN320 10.2/2013 – 26 September 2013

Quick Repeat from Week 9

• How can we compensate for the effects of an activity?

• How can we perform routines in parallel to a process?

• What is an alternative notation to boundary events?

BPMN Modelling- Choreography diagrams -


BPMN 2.0 model types


Choreography Diagram

Focuses on the interactions among two or more participants.

Order

Order Cancelation

Cancelation Ack

Order Confirmation Payment

Invoice

Cus

tom

erM

anuf

actu

rer

Requestfor Quote

Quote


Choreography Diagram (cont’ed)

Cancel Order

Order

Place OrderGet Quote

Confirm Order

Order Cancelation

Cancelation Ack


Pay for Order

Invoice

Cus

tom

erM

anuf

actu

rer

Requestfor Quote

Quote

Interactions can be explicitly

captured


Choreography Diagram (cont’ed)

Cancel Order

Customer

ManufactuerOrder

Place Order

Manufacturer

Customer

Requestfor Quote

Quote

Get Quote

Manufacturer

Customer

Confirm Order

Customer

Manufactuer

Order Cancelation

Cancelation Ack


Pay for Order

Manufacturer

Customer

Invoice

Pools can be dropped


Choreography

Process model of the interactions taking place between two or more business parties

• Focuses on message exchange between parties• Acts as a contract between parties• Can be refined into private processes or into a

collaboration diagram


Choreography Task

• Atomic activity• Represents an interaction between two business parties• Either one-way (asynchronous) or two-way

(synchronous)• Distinction between initiating and receiving party

Recipient

Initiator

Choreography Task Name


Choreography Task

• Band of initiating party unfilled• Message icons optional

Choreography Task Collaboration View

Garage

Customer

Estimate of costs

Car

Cost estimate

Cus

tom

er

Handover car Evaluate cost estimation

Gar

age

Evaluate damage

CarCost estimate

...

...


Basic Choreography Elements

Sequence flow – Connects and orders choreography tasks, events and gateways

Events – Most process events allowed. No non-interrupting events

Gateways – All process gateways allowed: Exclusive, Inclusive, Parallel and Event-based gateways

AnnotationText annotations, groups – No restrictions on their use


Choreography Sequencing Constraints

The initiator of a Choreography Activity must have been involved in the previous Activity (excluding first activity)

Why?!

Business Process Model and Notation, Page 338OMG Document Number: formal/2011-01-03

January 2011


Choreography Sequencing Constraints

Business Process Model and Notation, Page 339

OMG Document Number: formal/2011-01-03

January 2011


Example: Choreography of an auction

A Seller sends information about an item he wants to sell to an auction Provider. The Provider publishes the auction by offering the item to the Bidder. Once the auction has started the Bidder may place an offer. In case the item is sold the auction Provider finalises the purchase with the Buyer, otherwise he notifies the Seller that his item has not been sold.


Solution: Choreography of an auction

Auction Provider

Seller

Compile auction

Auction Provider

Bidder

Place offer

Auction Provider

Buyer

Finalize purchaseItemsold

Auction Provider

Seller

Notify of unsold item

Itemnot sold

Auction Provider

Bidder

Offer item

Decision needs to be taken by

preceding interaction,

based on available data

Initiator must be the party that

took the decision


Choreography Task – Internal Markers

Only one of the loop or multi-instance applicable Loop Multi-instance

Party B

Party A

Choreography Task

Party

A Send Message

Party

B

Receive Message

Party B

Party A

Choreography Task

Party

A Send Message

Party

B

Receive Message


Choreography TaskMulti-instance Party marker

• Parties may be multi-instance• E.g. customers or shippers

Party B

Party A

Choreography Task

Party

A Send Message

Party

B Receive Message


Auction Provider

Seller

Compile auction

Auction Provider

Bidder

Place offer

Auction Provider

Buyer


Auction Provider

Seller


Itemnot sold

Auction Provider

Bidder

Offer item

Example: Choreography of an auction

Where can we use the MI party in the auction example?

Auction Provider

Seller

Compile auction

Auction Provider

Bidder

Place offer

Auction Provider

Buyer


Auction Provider

Seller


Itemnot sold

Auction Provider

Bidder

Offer item


Sub-Choreography

• Compound activity of a choreography• Involves at least two business parties• Loop, MI activity and MI party markers are applicable

Party A

Party C

Party B

Choreography Sub-Process Name

Party A

Party C

Party B

Choreography Sub-Process Name

Party A

Party B

Choreography Task Name X

Party B

Party C

Choreography Task Name Y


What is this choreography doing?

All parties involved in the interactions following the split must be involved in the interaction preceding the split, to

be aware of the timer

The interactions following an event-based split must have the same

receiver


Example: Choreography

Use this diagram as a template to build the corresponding collaboration diagram


Solution

So, what’s the difference between Collaboration and Choreography diagrams?


References

Required• Section 4.7 of Chapter 4 of textbook “Fundamentals of BPM”

Recommended• OMG (2011): BPMN 2.0 Specification• BPM Offensive (2011): BPMN 2.0 Poster• OGM (2010): BPMN 2.0 By Example

Web References• OMG BPM Initiative• BPMN Community

Books on BPMN• Silver B. (2011): “BPMN Method & Style” 2nd Edition, Cody-Cassidy


A/Prof. Marcello La RosaIS School Academic Director(Corporate Programs and Partnerships)BPM Discipline, IS School

Science & Engineering FacultyQueensland University of Technology126 Margaret StreetBrisbane QLD 4000Australia

p +61 (0)7 3138-9482e [email protected] www.marcellolarosa.com

Business Process Modelling -10.2/2013 -

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