The research presented in this document has two main hypotheses: (1) From locus of control theory, it was predicted that a warm, supportive, and consistent or stable home environment relates positively to internal control; (2) Methods derived from locus of control theory which increase an individual's observation and experience of behavior-effect contingencies give rise to more internality. Three samples were used to assess home environment correlates of locus of control. Another three samples were used to assess the validity of the second hypothesis. General conclusions are that the research at least partly supported the first hypothesis. There were sex differences in all samples with respect to the internal controls. For males, a warm, supportive, and consistent home environment related positively to internality. For females, there was support for the notion that less stable home conditions force girls to seek more self-reliance and become more internal. The second hypothesis was supported by the finding that perception of internal reinforcement control increased in early graders and college students at the conclusion of locus of control counseling efforts. (CK)