Challenge 5: granularity
In many applications, the events in the event log are at a different level of granularity than the activities relevant for end users. Some systems produce low-level events that are too detailed to be presented to stakeholders interested in managing or improving the process. Fortunately, there are several approaches to preprocess low-level event logs. For example, in [13] it is shown that frequently appearing low-level patterns can be abstracted into events representing activities.