A dynamic model of multi-agent system

There are two purposes in this paper. First, it presents an approach to designing an agent. For adapting to the cooperative requests of the agents in a multi-agent system, we distinguish between the two aspects of underlying attributes of an agent: individual and organizational. And introduce a concept "pairs of roles". The other purpose is to show how to express the behavioral semantics of an agent and a multi-agent system with the "state transition graph". The individual attributes of an agent consist of beliefs and intentions, and for intentions we adopt the "twin-subset semantics" developed by us. While the organizational attributes of an agent consist of "pairs of roles". These compose the state of individual agent and the relations between agents. The state transitions are produced by the behaviors of agents and materialize the dynamic characters of agent and the turn of a multi-agent system. And the behaviors arise from the mental states of agents and the situations.