To understand patterns of student enrollment, particularly with regard to student attrition, Mercer County Community College developed a computerized information tracking system which monitors enrollment for each semester's entering class, both full- and part-time, for a period of six semesters. This report details enrollment patterns for fall 1969 through fall 1977 according to designated patterns of return, graduation, readmittance, persistence by curriculum and curricular groupings, and change of academic program. Findings reveal a shift from slightly larger numbers of full-time fall entrants before 1974 to an increasingly larger number of part-time fall entrants up to fall 1977; the spring part-time enrollments had been larger than full-time since 1972. The return rate after one semester peaked in 1974 for fall entrants, both full- and part-time, and in 1973 for spring full-time entrants; generally the return rates fluctuated only slightly for all categories and appear to have gained stability since the early 1970's. For transfer programs, career programs, certificate programs, and non-curricular programs, the non-return rate among full-time students entering fall 1976 was approximately 20%, with certificate programs having the highest rate of non-return and career programs the lowest. For part-time students, developmental programs had the highest non-return rate and career programs the lowest. Appendices contain definitions and full- and part-time persistence output for all years described. (MB)