In: Spaccapietra, S.: Entity-Relationship Approach: Ten Years of Experience in Information Modeling. Proceedings of the Fifth International Conference, pages 169-181. North-Holland, Amsterdam, The Netherlands, 1987.
Abstract: The authors describe a modeling language which aims at integrating both requirement specification and process simulation in the field of computer integrated manufacturing (CIM) systems. Such a language allows a complex system to be represented by means of a conceptual model which is based on an extension to the entity-relationship approach which captures the dynamic properties of the objects. Entities are specialized into states and the transitions from one state to another are expressed using a Petri net based formalism called PROT net.