A study examined the effect of assigned social decision rule (whether a jury is required to give a unanimous or less than unanimous verdict) on the process and product of mock jury deliberations. Subjects, 360 students from an eastern university, were randomly assigned to six-member juries under three decision rule conditions: (1) unanimity, (2)…

To provide a theoretical base for investigating the influence of inferential error on group decision making, current literature on both inferential error and decision making is reviewed and applied to the Watergate incident. Although groups tend to make fewer inferential errors because members' inferences are generally not biased in the same…