Changing patterns in how students apply to colleges and universities have affected the way institutional researchers project enrollment. This paper explores the usefulness of adding student prematriculation activities (i.e., commitment to enroll, registration patterns, and academic ability). Trends in prematriculation activity identified include increased student time investment in the college choice process, increased amount of information available to students, and increased numbers of applications sent out by each student. Admission trends have reflected these changes in record numbers of applications, declines in first year enrollments, more acceptances offered by colleges, but fewer students enrolling in their first choice of college. The data for this study were freshmen from 1991 to 1995 at Indiana University-Bloomington who were counted at four different times in the enrollment process. Findings indicated that although fewer students paid the enrollment deposit by May 1, 88 percent of those who did registered for classes in July. Numbers of students registering in July added significantly to the accurate prediction of fall enrollment as did student Scholastic Assessment Test scoree and high school rank. (DB)