Abstract
Existing studies on the collective choice processes in planning have not dealt with the situation where each individual doesn't understand his/her interest of alternatives clearly.
In this paper we build a model for the collective choice process with decision by majority with the group. In which the individual's preference is fracturing because of the propensity of following other's preference. As major finding of the model analysis, the strong following propensity makes supporter's distribution for each plans unstable. Also we find that the finally selected plans are not always the alternative that should be potentially ranked at the top.
