can react and discover basic conflicts among their attitudes, ideas, and modes of perception. On the basic of this information, they identify the problem to be investigated, analyze the roles required to solve it, organize themselves to take these roles, act, report, and evaluate these results. These steps are illuminated by reading. By personal investigation, and by consultation with experts. The group is concerned with its own effectiveness, and with its discussion of its own process as related to the goals of investigation. ( Thelen, 1960, p. 82)