Exploiting a statewide cutoff point on the placement examination used to assign students to remedial courses in Tennessee, this study employs a regression discontinuity research design to provide causal estimates of the effects on student outcomes of recently redesigned remedial courses at three Tennessee colleges. Moreover, using data on student outcomes prior to the course redesigns, the study also tests whether the redesigned remedial programs were more effective in preparing students for success in postsecondary education than the remedial programs they replaced. The findings indicate that, among students on the margins of the cutoff score, the effects of enrollment in developmental mathematics were positive and statistically significant on early student persistence as well as on the number of credits attempted but not completed in the first semester. However, these effects did not persist over time, as the results show no statistically significant differences between groups after two years. Yet the study also finds that students who were exposed to redesigned developmental math courses had more positive outcomes than did their peers in non-redesign institutions during the same period and also when compared with students who were exposed to the previous version of traditional remediation within their institution in prior years. Students appear to have benefited from redesigned courses at two of the three institutions. The results of this analysis provide insight into the extent to which the particular instruction and delivery methods of remedial courses affect subsequent student academic outcomes, thus informing administrators and policymakers as to how best to help underprepared students. Summarizing Course Redesign at Each Campus is appended. (Contains 7 tables, 4 figures and 22 footnotes.)