Concurrent event-based components present characteristics that impose difficulties in understanding their dynamic behavior, mainly for interpreting the cause & effect relations between input and output events in component interactions. In this paper, we propose a technique to help in the process of understanding the dynamic behavior of concurrent event-based components. It checks the event trace (generated by monitoring the component execution) against a specification of the component communication protocol (even with a possibly incomplete or incorrect specification). The technique identifies and presents the more probable cause & effect relations between the component events, providing also a measurement related to this probability.