Second, several problems and challenges can be distinguished when looking to individual systems of the spectrum. For example, for many types of systems we have to deal with events of which the granularity of the timestamp is low. One reason is that the timestamp only refers to the day on which events occur. Consequently, current process mining algorithms have problems with identifying the correct control-flow as the ordering of events within the log do not necessarily conform to the ordering of events on the day itself. Further research is needed in this respect.