HIN (Health Issue Network) is introduced as a peculiar approach to enhance Case-Based Learning (CBL) methodology for health sciences education, as well as innovative tool to query problem-oriented EHRs. In this paper HIN's Petri Nets-based formalism is described, and a first example of its twofold (lower and upper) representation level is proposed.
Keywords: CBL; EHR; Petri Nets; education; health issues.