faculteit technologie management cpn 2005 business process redesign at a mental healthcare...

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CPN 2005

Business Process Redesign at a Mental Healthcare Institute: A Coloured Petri Net Approach

M.H. Jansen-Vullers

H.A. Reijers

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CPN 2005

Goal of the project

• Testing applicability of CPN Tools for BPR

• Criteria:– Modeling of a business process– Simulation of a business process– Redesign (modeling and comparison of scenario’s)– Understandability/communication purposes

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CPN 2005

Modeling the control flow

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CPN 2005

NotificationsAnswer, record, store, print, check patient file

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CPN 2005

Subpage ‘Assign’

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CPN 2005

Subpage ‘Intake’

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CPN 2005

Modeling resources

• 5 types of resources

• Modeled as lists in fusion places

• Working part-time: resting and resets necessary

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CPN 2005

Modeling time triggers (1)

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CPN 2005

Modeling time triggers (2)

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CPN 2005

Simulation

• Stochastic duration of transitions– Uniform, beta and exponential distributions

• Smaller unit of time in the model– Precision due to rounding of real values in time stamps

• Measurements– Flow time – Service time

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CPN 2005

Generating cases

Color PAT = product ID * ST * CT * filetype;

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CPN 2005

Application of Monitors

• fun obsBindElem (determine_treatment'close_intake (1, {i, ct, id, spv, st, doc, file, tl0})) = IntInf.toInt(time())-(st)

• fun obsBindElem (determine_treatment'close_intake (1, {i, ct, id, spv, st, doc, file, tl0})) = ct

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CPN 2005

Simulation results

LOW AVG HIGHFlow time (days) 12,92 12,97 13,02Service time (days) 0,36 0,36 0,36

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CPN 2005

Redesign (example)

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CPN 2005

Simulation results - comparison

initial model LOW AVG HIGHFlow time (days) 12,92 12,97 13,02Service time (minutes) 174,18 174,65 175,11

redesigned model LOW AVG HIGHFlow time (days) 9,02 9,05 9,09Service time (minutes) 156,39 156,9 157,41

comparison abs. perc.Flow time (days) -3,8 -30%Service time (minutes) -17 -10%

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CPN 2005

Conclusion - applicability

– Modeling of a business processYES, but hard work!

– Simulation of a business processYES, and monitors very helpful!

– Redesign (modeling and comparison of scenario’s)Yes

– Understandability/communication purposes?? Models very complex for process owners…

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CPN 2005

Tool comparison (1)

• Protos – Only 24 transactions, but no simulation

• Workflow tools (e.g., Staffware, FileNet)– No configuration possible for measurements – No notion of reliability

• Arena (Rockwell)– Focus on standard building blocks (modeling support)– Drawback: expressive power

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CPN 2005

Tool comparison (2)

• ExSpect and CPN Tools+ CP nets: expressive power, mathematical foundation,

analysis techniques, reliability of simulation results+ Extensions possible in GCL or ML

– Difficult to understand by business users– Weak in modeling support

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CPN 2005

Tool comparison (3)

• ExSpect+ Scripts hide some of the details+ Number of building blocks already available+ Soundness checks in Woflan

• CPN Tools+ Performance during simulations (interactive evaluation

with process owners)

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CPN 2005

Conclusion… bridging the gap!

• Modeling control flow is ok

• Hiding some standard requirements for modeling business processes necessary– Handling of resources– Handling of batches– Modeling triggers– Calculating flow time and service time

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CPN 2005

Thank you for your attention !

Questions ??