Let us first consider the filtering of activities based on their characteristics, e.g., absolute or relative frequency. Figure 12.6(a) shows a filtering plug-in selecting all activities that occurred in at least 5% of all cases. This ProM 5.2 plug-in is applied to the event log used to construct Fig. 12.1, i.e., activities that do not appear frequently are removed from the event log. As a result, the process model will be simpler as fewer activities are included.