EN
In this paper we discuss the mechanism for building the negotiation offers' scoring system by means of the automatically generated indifference surfaces. We introduce the classic approach based on trade-off analysis first , that derives from multiple attribute value theory and present its application for the simplest case of two- and three-criteria decision problem. Then we analyze its generalization for the cases with more than three decision criteria, which involves also the interaction with decision maker. Finally we present the models software implementation that is applied in the negotiation support system called NegoManage.