This study dealt with the perceived parental attitudes of affection, physical contact, consistency-trust, security and perceived parental locus of control orientation as possible determinants of locus of control orientation in high school seniors. A second phase was concerned with the relationship of perceived parental locus of control orientation and of subject locus of control orientation to the variables of achievement and extracurricular activities. The results indicated that female internals perceive their parents as being more nurturant than do female externals. For males no relationships between locus of control orientation and parental attitudes were found. In the second phase male internality was found to be associated with higher grade point average and scores on achievement tests and female internality was associated with higher achievement scores. For both males and females parental internality was associated with some of the achievement measures. No relationships were found between locus of control scores and extracurricular activities. (Author)