al modelling studies the different abstraction methods of the real world. The conception and the execution of virtual worlds depend strongly of the type of conceptual models. Existing modelling methods such as object-oriented modelling are not appropriated when the main concern is the dynamic reusability and interoperability. Such a reusability and interoperability must be free of any human intervention. This paper presents a new paradigm named InteractionCentric Modelling (ICM) that increases reusability and interoperability of virtual entities and behaviours.