20 groups of Ss were given the task of learning to operate a model railroad which required the coordinated action of the members. The results indicated that the more the group consists of self-confident decision makers, possesses one person outstanding in this quality, or consists of individuals strongly oriented to others, the poorer the initial performance. The more intelligent the members of the group are, the better is their initial performance; and the more the group consists of a person who is uncontested as a self-confident decision maker, the better is its performance at later stages in learning.
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