A group decision making method and a study for analyzing consensus

The consensus of the group's decision-making data must be analyzed before group's opinions are integrated in multi-attribute group decision-making so that decision of group accords with the reality. This paper proposes three three-dimension hierarchy models; evaluating values of alternatives in individual decision-making are expressed by Euclidean distance; this paper puts forward coincidence indicator value a, which is judging basis of consensus of group data; also this paper proposes a group decision making approach on the basis of satisfying group consensus; finally this paper illustrates using step of this algorithm.