Workflow systems utilize a process model for managing business processes, and the model is typically a directed graph annotated with activity names. The following approach represents the model as a directed graph (workflow graph) with nodes representing activities and an edge from node A to node B. It describes process model and introduce their interval model.
It views the execution of an activity as a time interval, and present two new algorithms for synthesizing process models from sets of executions (audit log). A model graph generated by each of the algorithms for a process. They present their new algorithms for reconstructing a workflow graph from rich executions log.