Academic self-concept has been viewed by numerous investigators as an important facet of general self-concept. The Academic Self-Concept Scale (ASCS) was developed as a measure of academic self-concept in college students. The initial item pool consisted of 59 items worded to conform to a four-pont Likert-type response format. On the basis of responses from 427 college students, the final form of the ASCS was constructed consisting of 40 items with an estimated internal consistency reliability of .91. Validity was established by correlating the ASCS with grade point averages (GPAs) of students and their scores on the Rosenberg Self-Esteem Scale. A multiple regression analysis of the ASCS with GPA and Rosenberg scores as predictor variables resulted in a multiple correlation of .64. These and other data lend support to the reliability and validity of the ASCS as a measure of academic self-concept. (Author)