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Augmenting a Workflow Management System with Planning Facilities using Colored Petri Nets

Augmenting a Workflow Management System with Planning Facilities using Colored Petri Nets. Ronny Mans TU/e, AMC Nick Russell TU/e Wil van der Aalst TU/e Arnold Moleman AMC Piet Bakker AMC. Overview. Motivation Approach Workflow language Conceptual model Implementation

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Augmenting a Workflow Management System with Planning Facilities using Colored Petri Nets

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  1. Augmenting a Workflow Management System with Planning Facilities using Colored Petri Nets Ronny Mans TU/e, AMC Nick RussellTU/e Wil van der Aalst TU/e Arnold Moleman AMC Piet Bakker AMC

  2. Overview • Motivation • Approach • Workflow language • Conceptual model • Implementation • Experiences and conclusions

  3. Overview • Motivation • Approach • Workflow language • Conceptual model • Implementation • Experiences and conclusions

  4. Motivation • Workflow management systems: • workitems are offered via a worklist • Performed at an arbitrary point in time when a resource becomes available.

  5. Motivation • Hospital domain (doctors view). • Many appointments: • Patients • Staff meetings • … • Reason: • Expensive resource • Limited availability

  6. Motivation • Problem: people are used to work in a planned way which is not supported by current workflow management systems • Patient preferences • How to extend Workflow Management Systems • with planning facilities?

  7. Motivation • Rescheduling • Unused blocks in agenda • Inefficient use of resources • Monitoring • Limited time left for finishing tasks • Extension of WfMS with monitoring facilities to avoid rescheduling

  8. Research Question How to add planning and monitoring facilities to WfMS? Integration

  9. Overview • Motivation • Approach • Workflow language • Conceptual model • Implementation • Experiences and conclusions

  10. Approach WF language augmented with planning functionality • Understand problem domain • Experimentation • rapid prototyping

  11. Overview • Motivation • Approach • Workflow language • Conceptual model • Implementation • Experiences and conclusions

  12. Workflow language (WF-net) Flow tasks Schedule tasks

  13. Workflow language (WF-net) • Duration • Roles • Involvement of patient

  14. Overview • Motivation • Approach • Workflow language • Conceptual model • Implementation • Experiences and conclusions

  15. Conceptual model • Developed using • CPN Tools • 27 pages • 169 places • 377 transitions • 950 lines ML code 3 months of man-work (one person)

  16. Conceptual model

  17. Conceptual model • Communicating workitems • Worktray • Agenda • Manipulation of appointments • reschedule • reassign • reschedule to specific time • Planning problem • (re)scheduling of appointments • generate warning(s) • Routing of cases • Execution of tasks • Offering workitems

  18. Graph (Planning problem)

  19. Conceptual model

  20. Planning problem • (Re)schedule tasks • Warnings Cancellation of a case Appointments for resource

  21. Receive planning problem [no other planning problem] Conversion • Determine first sched tasks need to be (re)scheduled • If (re)sched then calc earliest time • Determine relevant info for tasks to be (re)scheduled • Determine first sched tasks whether warning is needed

  22. [all schedule tasks for case are scheduled andalso succeeding sched tasks need to be (re)scheduled] • Determine sched tasks to be (re)scheduled • If (re)sched then calc earliest time • Determine relevant info for tasks to be (re)scheduled • Automatic (re)scheduling • Find first opportunity for • One resource specified for each role • Patient • If found, book appointment • [no sched tasks need to be (re)scheduled] • Remove planning problem

  23. Overview • Motivation • Approach • Workflow language • Conceptual model • Implementation • Experiences and conclusions

  24. Implementation • 3 months of man-work • (one person) • 8000 lines of code

  25. Implementation

  26. Implementation Rescheduling of MRI Appointment needed

  27. Implementation

  28. Overview • Motivation • Approach • Workflow language • Conceptual model • Implementation • Experiences and conclusions

  29. Experiences and conclusions • Design and implementation of wf system offering planning and monitoring facilities • Workflow language • Conceptual model (CPNs) • Experimentation • More complete design • Abstraction from implementation details/language specific issues • Implementation

  30. Future work • “Replace” components in the CPN model by its concrete implementation • Evaluate alternative planning approaches using various performance indicators

  31. Questions???

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