Socialization and efficiency defined. How point of view differs from that of psychology of individual differences. The problem stated. Factors upon which efficiency in socialization is dependent. Summary of investigations in the field. Original data given covering choice of associates, selection of leaders, and controlling ideals. Conclusions are that efficiency is dependent upon presence and co-operation of the group, the best group is composed of those whose traits reinforce and supplement the others, dynamic leadership voluntarily selected must be present, and there must be identity of ideals and purposes. Special consideration stated. Limitations to conclusions, final summary.