In fall 1986, Mt. San Antonio College (MSAC) initiated a 5-year longitudinal study of the effectiveness of its matriculation services, including assessment, orientation, counseling/advisement, and follow-up. Students participating in these services were compared to those degree-seeking students who did not participate. The study sample included students who entered MSAC in fall 1986 (N=7,443), spring 1987 (N=4,623), fall 1987 (N=9,295), and spring 1988 (N=6,008). Study findings related to the fall 1986 cohort included the following: (1) 4,622 (62%) were seeking first-time degrees or certificates and therefore were subject to matriculation; (2) of these students, 3,312 (72%) participated in one or more matriculation components, while 1,310 (28%) did not participate; (3) 160 participated in all services, 2,142 in assessment, 1,488 in orientation, 1,276 in counseling/advisement, and 547 in follow-up services; and (3) between fall 1986 and spring 1988, matriculated students who participated in one or more services completed more units, but earned lower grade point averages than non-matriculated students in the same cohort. The report presents graphs and tables for all entering cohorts. (AJL)