The research work presented in this thesis aim at proposing a model of coordination of negotiations within the framework of an alliance of companies. Our research is placed thus in the fields of virtual alliances, of automatic negotiation and of coordination. Within these broad frameworks, we present and defend the thesis according to which the process of negotiation can be broken up into three distinct processes: decision, coordination and communication. Another dimension of the scientific contribution of this thesis is to establish the bases of a generic, decentralized and flexible coordination model. This model separates the process of coordination from the others two, thus making the process of coordination independent of the negotiation strategy or of the negotiation protocol and adaptable to various types of negotiations.
