“…Most colleges and universities drop unsatisfactory students on the basis of their average grades, and reward those who achieve high marks. There are two methods of experimental design applicable: the comparison of the student's grade average before and after counseling (2,4,8,19,24,43); or a comparison of the average grade of counseled students with that of non-counseled students who have been matched for such characteristics as age, sex, level of ability, size and type of high school, and high-school grades (13,15,20,27,41,42).…”