hierarchical conformance checking of process models based on event logs jorge munoz-gama, josep...

HIERARCHICAL CONFORMANCE CHECKING OF PROCESS MODELS BASED ON EVENT LOGS

Jorge Munoz-Gama, Josep Carmona and Wil M.P. van der Aalst

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Session 7: Process Mining and Conformance

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Process Mining in a Nutshell

THEORY REALITY

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Process Mining in a Nutshell

THEORY REALITY

??REALITY REFLECTION

LOGS

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Session 7: Process Mining and Conformance

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Conformance in a NutshellLog Model

A B C D EA B B C

Alignment

E

Fitness Precision

How much behavior of the logis captured by the model?

How accurate is the modeldescribing the log?

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Conformance in the Large• How easy is to diagnose a conformance problem here?• How much time it takes?

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Process Diagnosis like a Map

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Process Diagnosis like a Map

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Decomposition Goals

• Intuitive and independent decomposition

• Hierarchy between components

SESE RPSTSingle EntrySingle Exitcomponents

Refined Process Structure Tree

* Artem Polyvyanyy: Structuring Process Models. PhD Thesis. University of Potsdam (Germany), January 2012

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Structural Decomposition

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Interior, Boundary, Entry, and Exit nodes

• Given a subgraph and a node of it:

• Interior node: connected only to nodes of the subgraph.

• Boundary node: not interior

• Entry node: boundary where • no incoming edge in subgraph • or all outgoing edges in

• Exit node: boundary where • no outgoing edge in subgraph • or all incoming edges in

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Example of SESE and RPST

SESE: set of edges which graph has a Single Entry node and a Single Exit node

Refined Process Structure Tree (RPST) containing non overlapping SESEs

• Unique• Modular• Polynomial Time

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Decomposed Conformance

• For each component in the RPST

• Project the Log

• Initial and Final marking of subnet

• Align projected log and subnet

• Compute fitness and precision<

t5 t6 t5t1 t2 t3 t3 t7

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Conformance and Markings Dependency

• The conclusions are strongly dependent on the markings

A

B

C

A

B

C

D

E

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Component inside a Cycle

X

Y

A B

B C DA

E

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Depending Analysis• Test components in isolation

• Black Box• Multi-scenario responses

• Exploit properties• Safe, bounds, …• Acyclic• Subclass of Petri Net• Domain specific properties

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Safe Sound Workflow Nets (1)• Entry/Exit Places

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Safe Sound Workflow Nets (2)• Initial Marking = one token on the entry• Final Marking = one token on the exit

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Safe Sound Workflow Nets (3)• Short-circuited the entry and exit with invisible transition

• Heuristic: all transitions of the component belong to T-invariants of the original net• Best effort but good empirical results

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Implementation

ProM 6 (http://www.promtools.org)

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Implementation

ProM 6 (http://www.promtools.org)

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Results

• 1 Component – 1h 15min• 7 Components – 2min

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Future Work

• Decomposed Conformance Checking Problem• Not hierarchy but partitioning• Reducing the time• Non depending results

Conformance Checking in the Large: Partitioning and Topology

J. Munoz-Gama, J. Carmona and W. van der AalstBusiness Process Management (BPM) 2013

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Conclusions• Decomposition based on SESEs and RPST to aid on the

diagnosis of conformance problems

• Strong dependency between the context selected and the results obtained.

• Case of Safe Sound Workflow Nets

• Implemented in ProM 6

Thank You