Study strategies are the activities that an individual uses to facilitate learning. Although no consistent findings exist to show the factors that comprise the study-strategy concept, a three-factor conceptualization (cognitive, affective, and behavioral) is often suggested. These factors were studied with 128 undergraduates of high and low ability based on their scores on the ACT Assessment. The Survey of Study Habits and Attitudes and the Learning and Study Strategies Inventory were completed by each student. To assess construct validity, correlation coefficients were also computed between the various scale scores of the two instruments. The instruments were found to measure at least some of the same constructs or factors. Results indicated that the study-strategy concept is composed of: (1) a personality factor of personal values and feelings; (2) a cognitive skills factor; and (3) a behaviors and techniques factor concerned with the use of study skills. Results do support a three-factor structure of the concept. (Contains 6 tables and 29 references.) (SLD)