A longitudinal study of full- and part-time students was undertaken at William Rainey Harper College (WRHC) to provide institutional data about student performance over time. Each fall from 1967 to 1980, transcripts of a random sample of 200 full-time and 200 part-time beginning credit students were analyzed to obtain data about students' attendance and graduation patterns, grades, age, prior college experience, and high school standing. The study revealed that: (1) student grade point averages increased following two changes in WRHC grading policy; (2) the average full-time student starting between 1972 and 1978 attempted an average of 44 hours, passed an average of 42 hours, and attended for an average of 4.4 semesters; (3) 10% of the full-time students stayed for seven or more semesters; (4) 73% of the entering full-time students returned the following year or later; (5) 35.5% of the full-time students attending between 1972 and 1977 earned an associate degree or certificate; (6) the average part-time student beginning between 1971 and 1977 attempted an average of 18 hours, passed an average of 16.5 hours, and attended for an average of 3.3 semesters; (7) 15% of the part-time students attended seven or more semesters, and 10.5% received an associate degree or certificate; (8) continuing education enrollments increased rapidly from 1970; and (9) between 1967 and 1980, 5% to 15% of the students transferred credits from another college, and 35% to 45% had some previous post-secondary experience. (Author/HB)