Abstract
Some studies report that activists are Internals, while others claim they are Externals, holding a belief in chance, fate, and powerful others. Three new scales were constructed in order to measure belief in chance (C) as separate from expectancy for control by powerful others (P), and perceived mastery over one's personal life (I). Two studies are reported. (1.) As predicted, responses from 96 adults indicated that only a belief in chance was differentially related to involvement and information on anti-pollution activities. (2.) In factor analyzing the responses of 329 college males to the 24 items of the new scales, three main factors were identified — I, P, and C. The validity and usefulness of the tripartite division in clarifying past findings regarding the multidimensionality of I-E were discussed.

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