In this paper we present a model of self-interested agents acting in an open environment, which captures the most relevant elements of agents' behaviour related to negotiation with other agents. The agent behaviour is mainly motivated by the gain they may obtain while fulfilling their goals and negotiating. Sometimes, the agents are also motivated by the necessity to cooperate with other agents for achieving their goals. The key element in the agent behaviour is their capability to develop a set of negotiation profiles: the preference profile, the partner cooperation profile and the group-of-partners negotiation profile; these profiles help the agents to conduct their negotiation.
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