In fall 1996, California's Saddleback Community College began enforcing a prerequisite mathematics course for the college's Algebra (Math 8), Statistics (Math 10), and Trigonometry (Math 124) series. The 11 memoranda collected in this report present results from a study of the effects of enforcing the prerequisite on successful completion of the three subsequent courses. Data are presented on the following topics: (1) successful completion rates in Math 8, 10, and 124 in fall 1996, compared to pre-enforcement rates in fall 1994 and fall 1995; (2) methods used by students to meet the prerequisite in fall 1996; (3) course completion rates by the method used to fulfill the prerequisite; (4) the relationships between the grade received in the prerequisite course and the subsequent math course chosen, successful completion in the subsequent course, and the number of previous attempts at the course or higher level courses; (5) for individual sections of Math 8, 10, and 124, differences in average grade received in the prerequisite course for students who completed the course at the college; (6) whether the rate of success in subsequent courses declined as the time since the completion of the prerequisite increased; (7) whether success rates declined over time for students who satisfied the prerequisite by passing an exam; (8) the relationship between scores on the prerequisite exam and success rates in Math 8, 10, or 124; and (9) the high school of origin for students fulfilling the prerequisite while in high school. (TGI)