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Business Process Modelling -8.2/ Marcello La Rosa Queensland University of Technology Brisbane, 12 September 2013
© INB/INN /2011 – 12 September 2013 Mid-semester survey: your words, our actions… Generally, very positive comments. A few notes worth commenting: 1.Too many readings: read the required readings, the others are for your own culture and interest 2.Use of Signavio: not mandatory 3.Tutorial notes online late: usually on Friday, we will strive to put them up on Thursday after the class 4.Assignment specification came up too early, content not yet fully covered: the idea is that you build your report incrementally rather than being confronted with a lot of content altogether. No self- study required. Do not anticipate content! 5.Audio quality poor: AV Support notified. 6.THU 8pm tutorial inconvenient: moved to S502 at 5pm for Weeks Week 13 in S503 at 8pm. 2
© INB/INN /2011 – 12 September 2013 Tutorials attendance rate 3 TimeMonTueWedThuFri 9am S502 (10) 10am S518 (10) 11am 12am 1pm S506 (20) S503 (25), S506 (10) 2pm S507 (20) 3pm S410 – LECT 4pm S410 – LECT 5pm S502 (35) NEW! 6pm 7pm 8pm S503 (30)S503 (35) Raffaele, Eike, Stephan
© INB/INN /2011 – 12 September 2013 Quick Repeat from Week 7 What splits and joins can be represented implicitly in BPMN? What is a sub-process? How can we model repetition in BPMN? What is a multi-instance task? 4
© INB/INN /2011 – 12 September 2013 Uncontrolled Repetition: Ad-hoc sub-process The ad-hoc sub-process contains activities (tasks or sub- processes) to be executed in arbitrary order and time May define order of sub-set of activities by sequence flow Can be used in an early version of a process diagram when the order of execution is still unknown Denoted with a tilde marker on the expanded sub-process notation 5
© INB/INN /2011 – 12 September 2013 Example: ad-hoc sub-process A typical army selection process starts by shortlisting all candidates applications. Those shortlisted are then called to sit the following tests: drug and alcohol, eye, color vision, hearing, blood, urine, weight, fingerprinting and doctor examination. The color vision can only be done after the eye test, while the doctor examination can only be done after color vision, hearing, blood, urine and weight have been tested. Moreover, it may be required for some candidates to repeat some of these tests multiple times in order to get a correct assessment, e.g. the blood test may need be repeated if the candidate has taken too much sugar in the previous 24 hours. The candidates that pass all tests are asked to sit a mental exam and a physical exam, followed by an interview. Only those that also pass these two exams and perform well in the interview can be recruited in the army. 6
© INB/INN /2011 – 12 September 2013 Solution: ad-hoc sub-process 7
© INB/INN /2011 – 12 September 2013 Value chain modelling 8 is predecessor of Business process Chain of (high-level) processes an organisation performs in order to achieve a business goal, e.g. deliver a product or service to the market.
© INB/INN /2011 – 12 September 2013 Linking value chains with process models 9 Process model for this business process is available
BPMN Modelling - Events Handling -
© INB/INN /2011 – 12 September 2013 Event types 11
© INB/INN /2011 – 12 September 2013 Event types (cont.ed) 12
© INB/INN /2011 – 12 September 2013 Message and Timer events Modelling Exceptions 13
© INB/INN /2011 – 12 September 2013 Example: message event Start event (receive) Intermediate catching event (receive) End event (send) 14
© INB/INN /2011 – 12 September 2013 Comparison with sending/receiving tasks = = = = Is this really the same? 15
© INB/INN /2011 – 12 September 2013 So, when to use what? Use message events only when the corresponding activity would simply send or receive a message and do nothing else 16
© INB/INN /2011 – 12 September 2013 Example: timer event Start event Intermediate catching event Activities must always have input and output Sequence Flow 17
© INB/INN /2011 – 12 September 2013 Find the bugs… Start Message Events cannot signal message sending Normal Flow cannot be used to pass on Data Objects Start Timer instead of Intermediate Timer Timer events cannot be used to wait for messages Tasks cannot lead only to Exception Flow Each Pool (white box) must have one start and one end event 18
© INB/INN /2011 – 12 September 2013 A possible solution… 19
© INB/INN /2011 – 12 September 2013 Example: modelling with events 20 A Purchase Order (PO) handling process starts when a PO is received. The PO is first registered. If the current date is not a working day, the process waits until the following working day before proceeding. Otherwise, an availability check is performed and a PO response is sent back to the customer.
© INB/INN /2011 – 12 September 2013 Example: modelling with events A Purchase Order (PO) handling process starts when a PO is received. The PO is first registered. If the current date is not a working day, the process waits until the following working day before proceeding. Otherwise, an availability check is performed and a PO response is sent back to the customer. Anytime after the PO has been registered, the customer may send a PO change request. When such a PO change request is received, any processing related to the PO must be stopped. The PO change request is then registered. Thereafter, the process proceeds as it would do after a normal PO is registered. 21
© INB/INN /2011 – 12 September 2013 Solution: modelling with events 22
© INB/INN /2011 – 12 September 2013 Alternative solution 23
© INB/INN /2011 – 12 September Quiz: whats wrong with this model?
© INB/INN /2011 – 12 September 2013 Event-based decision With the XOR-split gateway, a branch is chosen based on conditions that evaluate over available data The choice can be made immediately after the token arrives from the incoming flow Sometimes, the choice must be delayed until an event happens The choice is based on a race among events This is why BPMN distinguishes data-driven and event-driven XOR-splits data-driven XOR-split event-driven XOR split 25
© INB/INN /2011 – 12 September 2013 Example: event-based decision Restaurants submit orders to suppliers to replenish their food stocks every Thursday. The process for completing an order starts when a restaurant receives either a PO Response or an error message. However it may also happen that no response is received at all. If no response is received by Friday afternoon or if an error message is received, the purchasing officer should be notified. Otherwise, the PO Response is processed normally. 26
© INB/INN /2011 – 12 September 2013 A possible solution 27
© INB/INN /2011 – 12 September 2013 Quiz: find the bugs not Intermediate Timer Event 28
© INB/INN /2011 – 12 September 2013 Solution: event-based decision 29
© INB/INN /2011 – 12 September 2013 Remember the quiz from slide 23? 30
© INB/INN /2011 – 12 September 2013 Interlude: multiple start events The first such event that occurs, will trigger an instance of the process. 31
© INB/INN /2011 – 12 September 2013 What is this process doing? 32
© INB/INN /2011 – 12 September 2013 Recap: Events 33
© INB/INN /2011 – 12 September 2013 BPMN Poster: get it from blackboard! 34
© INB/INN /2011 – 12 September 2013 References Required Sections 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 2 nd Edition, Cody-Cassidy 35
© INB/INN /2011 – 12 September 2013 A/Prof. Marcello La Rosa IS School Academic Director (Corporate Programs and Partnerships) BPM Discipline, IS School Science & Engineering Faculty Queensland University of Technology 126 Margaret Street Brisbane QLD 4000 Australia p +61 (0) e w
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