“…The various models proposed in the last decades were derived referring to a general mathematical structure, suitable to capture the complexity features of large systems of interacting entities, and hence suitable to provide the conceptual basis towards basis for the derivation of specific models, which are derived by implementing the said structure by heuristic models of individual based interactions. On the other hand, recent papers by researchers involved in the practical management of real crowd dynamics problems, including crisis and safety problems, have enlighten that social phenomena pervade heterogeneous crowds and can have an important influence on the interaction rules [7,16,23,24,25,31,32,37,41,43,44]. Therefore, both social and mechanical dynamics, as well as their complex interactions, should be taken into account.…”