The purpose of this project was to identify characteristics of Scholastic Aptitude Test (SAT) candidates planning to study part time, to examine trends in part-time enrollment in colleges requiring the SAT, to investigate college admissions requirements for part-time students, and to determine whether those colleges are concerned about the validity of the SAT for part-time students. From Higher Education General Information Survey (HEGIS) data it was determined that part-time freshman enrollments in four-year colleges increased 8.4 percent between 1976 and 1980. The greatest rise was among those colleges with the largest number of part-time students. The greatest percentage increase was in the highly selective institutions and in the least selective colleges. From SAT files students planning to study part time were compared with students planning to study full time. Among part-time students, there were a higher proportion of females and ethnic minorities. Part-time candidates came from lower socioeconomic status families, fewer had been in academic programs in high school, and a greater percentage were uncertain about their educational goals. As a third data source, a telephone survey of 72 four-year colleges having SAT score averages above 900 was conducted. Most colleges had the same SAT admission requirements for part-time as for full-time students. (Author/BW)