The article is devoted to studying the efficiency of group decision-making. There were examined foreign and domestic authors' works. Although it is noticed that the study of the efficiency of decision-making in foreign social psychology (Marjorie Shaw, Stasser, Titus, Larson, Foster-Fishman, Keys, Stewart and others) passed through several stages, both optimistic and skeptical, it does not lose its topicality in the present time. For domestic psychology other ways are specific for solving the problem of the efficiency of decision-making. For example, some works are devoted to the efficiency of managerial decision-making (A.V. Pilipenko, S.A. Sokolov, Yu.V. Spiridonov, V.N. Stepanosov, R.S. Subbotin, A.V. Tarasenko, A.V. Timoshkov and others). In the article factors are designated that affect the efficiency of decision-making in a group. For example, such factors as the effect of knowledge combining (M. Show), the effect of joint information (G. Steysser and R. Titus), polarization and risky shift (G. Stouner), mass thinking (G. Lebon), "groupthink" (I. Janice), personality factors (T.V. Kornilova), social-perceptual processes (A. G. Kostinskaya), cognitive effects (L.V. Mararitsa). The author's own results of an experimental research of the efficiency of group decision-making are presented. The aim of the study was to identify the nature of game effect on the efficiency of group decision-making. The research was in the form of a business game "Personnel issue". The experiment involved 122 people (33 men and 89 women) aged 17 to 25. There were 30 small groups of 3 to 5 people. The participants were divided into two broad categories depending on the instructions of the experimenter, who offered them to play one of two roles - the role of close friends or the role of members of the Commission on labor disputes. The experiment examined the consistency of group decision with the viewpoints of individual members of the group depending on the game role. There was examined the dependence of the confidence of each member of the group in the correctness of the decision, as well as the dependence of subjective appeal of the decision on the role given by the experimenter. The results indicate the presence of such a dependence. However, some results need further experimental verification. Finally, the consistency of group decision with the viewpoints of individuals, as well as confidence in the correctness and appeal of the decision depending on the game role of the group members was experimentally proved. It is concluded that the role played by individuals also affects the efficiency of the group decision.
