An evolutionary technique for supporting the consensus process of group decision making.

Discrepancies arise when experts have to decide the preference on alternatives for a problem. Henceforth, it is necessary to carry out a process during which they adjust their opinions in order to achieve an acceptable consensus. Usually, this process is coordinated by a moderator that makes suggestions to the participants regarding the most adequate changes. In order to simplify this process, we propose an evolutionary technique based on the search of the changes of the preferences that improve the consensus degree. We also consider that the opinions of the experts should stay closer to the original ones. Taking into account these two factors, we are able to provide useful feedback for the experts willing to get a consensus and measure how much improvement can be achieved.