Business Process Variant Analysis based on Mutual Fingerprints of Event Logs

TL;DR

This paper introduces a novel method for comparing business process variants by analyzing entire process traces using mutual fingerprints, enabling more meaningful detection of differences in control-flow and performance.

Contribution

The paper presents a new technique to learn mutual fingerprints from event logs, capturing entire process traces for more accurate variant comparison at a higher level of abstraction.

Findings

The approach detects significant differences at the trace level that baseline methods may miss.

Mutual fingerprints provide a lossless encoding of process traces and durations.

The method outperforms baselines in real-life event log evaluations.

Abstract

Comparing business process variants using event logs is a common use case in process mining. Existing techniques for process variant analysis detect statistically-significant differences between variants at the level of individual entities (such as process activities) and their relationships (e.g. directly-follows relations between activities). This may lead to a proliferation of differences due to the low level of granularity in which such differences are captured. This paper presents a novel approach to detect statistically-significant differences between variants at the level of entire process traces (i.e. sequences of directly-follows relations). The cornerstone of this approach is a technique to learn a directly follows graph called mutual fingerprint from the event logs of the two variants. A mutual fingerprint is a lossless encoding of a set of traces and their duration using discrete wavelet transformation. This structure facilitates the understanding of statistical differences along the control-flow and performance dimensions. The approach has been evaluated using real-life event logs against two baselines. The results show that at a trace level, the baselines cannot always reveal the differences discovered by our approach, or can detect spurious differences.