Proposal of group decision support system for commodity purchase using Kansei and SOM

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