This report offers research and analysis of outcomes for 15,743 students who enrolled in basic skills mathematics classes at Rio Hondo College in California between fall 1996 and summer 2001. The research was done at the request of the basic skills mathematics faculty. Although the California Community College Chancellor's Office defines remedial math as Math 020 and Math 030 only, Rio Hondo includes Math 050 and Math 070 in their definition of basic skills math because they are not transfer-level courses. Counting enrollments rather than individual students, the overall success rate (grades of A, B, C, or CR) for basic skills math was 43%. Course enrollment success rates were 41% at the Math 020 level, 49% at the Math 030 level, 41% at the Math 050 level, and 42% at the Math 070 level. Of the original 5,579 students enrolling in Math 020, 2,068 (or 37%) attempted Math 030, and about 64% of those who attempted that next level succeeded. A total of 1,109 (20%) of the original group attempted Math 050, and their success rate was 55%. Only 382 (about 7%) of the original 5,579 students attempted Math 070. Of those 382, the success rate for Math 070 was 62%. Withdrawals were high because of enrollment requirements for Math/Science Center module courses. Success rates improve markedly for all sections when withdrawals are excluded. (NB)