In this paper we present a generic model for situated multi-agent systems (MAS). Situated agents live and act in the present: they perform situated actions, i.e. actions selected on the basis of their position, the state of the world they perceive and limited internal state. The model we discuss is based on the model of influences and reactions to influences developed by J. Ferber and J.P. Mueller. This model separates what agents do and the reaction of the environment upon this, solving the fundamental problem of handling simultaneous actions. However, the model is limited to synchronous descriptions of MAS evolution. Forcing all agents of the MAS to aet in lock step does not fit with autonomy of agents and scalability. Besides, global synchro-
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