Almost 70% of college students in California are required to take at least one remedial education course in mathematics or English, and of those students, only 40% continue to succeed in their educational goals of transfer or receiving a degree ("Student Success Scorecard," n.d.). Corequisite support remediation is an alternative to traditional remediation course sequences, allowing students to take transfer-level coursework in their first semester. This doctoral study investigated the effectiveness of corequisite support for STEM students. Chapter one covers the introduction to the problem and significance of the study. Chapter two is the literature review, which examined the history of the California community college system, remedial education, and adult learning theory. Chapter three offers the results of the research study, which used a non-experimental quantitative design to investigate the possibility of statistical differences in rates of success in the first attempt, one-year throughput, and one-year enrollment for students who took trigonometry with corequisite support versus those who took traditional remediation. In addition, how those students did in later math (precalculus) and STEM coursework (general chemistry first semester) was also examined. A chi square test for independence determined statistical significance. Findings highlighted that all three courses produced no statistically significant difference in the success of the first attempt, while one-year throughput and one-year enrollment rates were all higher for corequisite support. Chapter four is the application of practice in which a professional development training was created, going over the application of adult learning theory to corequisite support courses and reporting the results of the research study. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]