Abstract: The negotiation problem of bilateral multiissues with incomplete information is addressed in this paper. Aiming at the maximization of joint utility of the two sides, based on Technique for Order Preference by Similarity to an Ideal Solution (TOPSIS) method, an intelligent negotiation model is developed for the problem. By this model, in the process of negotiation, one side can make compromise according to certain rules. With this model, by using TOPSIS method, one side finds best solution for the other side, while it ensuring the utility for itself. Thus, the utility of both sides is maximized. An example is used to validate the proposed method. This is done by numerical simulation to check the gap of the joint utility under complete and incomplete information environment.

Key words: electronic commerce, bilateral multiissue, intelligent negotiation, TOPSIS algorithm