Over the past 20 years, the Maricopa County Community College District (MCCCD) has undergone a substantial shift in the number of credit hours for which its students enroll. In 1969, the percentage of students who enrolled for three credit hours or less was 20%, and they generated 6% of the full-time student equivalent (FTSE) enrollment. At that time, students who enrolled for 12 credit hours or more represented almost 40% of the headcount and more than 65% of the FTSE. By the fall of 1987, 47% of MCCCD's students enrolled for three credit hours or less, and they generated almost 20% of the FTSE. Only 18.5% of the students took 12 credit hours or more, generating less than 42% of the FTSE. Nationwide, approximately 70% of community college students enrolled in 1970 attended full time, while in 1987, 33% were full-time students. The main implications of the growing percentage of students attending part-time are the effect on funding, within the framework of a formula that assumes students attend full time, and the length of time needed by a part-time student to obtain an associate degree. Given demographic trends and MCCCD's efforts to accommodate adult students, it is likely that this trend toward part-time enrollments will continue. Tables showing credit hour distributions are appended. (JMC)