A Study on Performance of Group Decision-making in Electronic Democracy

In traditional theory of group decision-making, scholars focused on the research about convergence performance, including convergence and convergence time, under the condition of fixed preference domain. In this paper we attempt to change the preference domain and its length in order to investigate the influence of different preference domain on convergence performance in group decision-making. A reasonable model of preference evolution is developed, in which every decision-maker chooses his interactive objectives and updates his preference according to the difference between their preferences. Results through several simulations show that the preference domain impacts greatly on the convergence and convergence time; when the ratio between the length of initial preference domain between confidence level is constant, the convergence performance remains invariable.