Proposal of Group Decision Support System Using SOM for Purchase of Automobiles

This paper describes a group decision support system (a negotiation support system) based on Kansei of group members using SOM for automobile purchase for family. Firstly, we evaluate Kansei scores of automobiles existed in real world using Kansei engineering. Secondly, we make a SOM map based on both the Kansei scores of the real automobiles and ideal automobiles of the group members. If Kansei scores of the ideal automobiles of members are far away from each other on the SOM map, the system shows some compromise proposals to the members for negotiation. Where, the compromise proposals are made by small changes of Kansei scores of members. Finally, the Kansei scores of their ideal automobiles gather into a small area on the SOM map, then the system decides some real automobiles nearest to the area as an negotiation result of members.