In Sect. 5.4, we discussed the challenges related to process mining. They are of particular relevance when dealing with Spaghetti processes. Event logs do not contain negative examples, i.e., only positive example behavior is given. The fact that something does not happen in an event log does not mean that it cannot happen. For example, Fig. 12.4 is based on an event log in which almost all cases follow a unique path (the 208 cases generate 203 different traces). Therefore, the discovery algorithm needs to generalize.