Abstract
In Japanese society corporate scandals, such as systematic violation, were found out one after another, and they have made profound impact on the society for these years. Most of all, the fact that acts clearly regarded as illegal were accepted in such corporation increased public distrust of it. Among various factors which lead to systematic violation, we consider decision procedures as one of the most important factors. Since violations were accepted through formal meetings at JCO which caused criticality accident, it must be paid to attention that which procedure is taken in group decision making. We take up motivation style of each member to speak out, group size, and decision rules, and using numerical computer simulation, examine the relationship between these factors and adoption rate of proposal submitted by a member. Adequate procedure suited to situations is discussed.
