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Business Process Modelling -8.2/2013 -

Business Process Modelling -8.2/2013 -. Marcello La Rosa Queensland University of Technology. Brisbane, 12 September 2013. Mid-semester survey: your words, our actions…. Generally, very positive comments. A few notes worth commenting:

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Business Process Modelling -8.2/2013 -

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  1. Business Process Modelling-8.2/2013 - Marcello La Rosa Queensland University of Technology Brisbane, 12 September 2013

  2. Mid-semester survey: your words, our actions… Generally, very positive comments. A few notes worth commenting: • Too many readings: read the required readings, the others are for your own culture and interest • Use of Signavio: not mandatory • Tutorial notes online late: usually on Friday, we will strive to put them up on Thursday after the class • 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! • Audio quality poor: AV Support notified. • THU 8pm tutorial inconvenient: moved to S502 at 5pm for Weeks 8-12. Week 13 in S503 at 8pm.

  3. Tutorials attendance rate Raffaele, Eike, Stephan

  4. 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?

  5. Uncontrolled Repetition: Ad-hoc sub-process • The ad-hoc sub-process contains activities (tasks or sub-processes) to be executed in arbitrary orderand 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

  6. 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.

  7. Solution: ad-hoc sub-process

  8. Value chain modelling 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. Business process “is predecessor of”

  9. Linking value chains with process models Process model for this business process is available

  10. BPMN Modelling- Events Handling -

  11. Event types

  12. Event types (cont.’ed)

  13. Message and Timer events Modelling Exceptions

  14. Example: message event Start event (receive) Intermediate catching event (receive) End event (send)

  15. Comparison with sending/receiving tasks = Is this really the same? = = =

  16. So, when to use what? Use message events only when the corresponding activity would simply send or receive a message and do nothing else

  17. Example: timer event Start event Intermediate catching event Activities must always have input and output Sequence Flow

  18. Find the bugs… Start Message Events cannot signal message sending Each Pool (white box) must have one start and one end event Normal Flow cannotbe 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

  19. A possible solution…

  20. 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.

  21. 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.

  22. Solution: modelling with events

  23. Alternative solution Is it really right?

  24. Quiz: what’s wrong with this model?

  25. 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 event-driven XOR split data-driven XOR-split

  26. 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.

  27. A possible solution

  28. Quiz: find the bugs • not Intermediate Timer Event

  29. Solution: event-based decision

  30. Remember the quiz from slide 23?

  31. Interlude: multiple start events The first such event that occurs, will trigger an instance of the process.

  32. What is this process doing?

  33. Recap: Events

  34. BPMN Poster: get it from blackboard!

  35. References • Required • Sections 4.3.2 - 4.4.2 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

  36. 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 m.larosa@qut.edu.auw www.marcellolarosa.com

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