"University of Chicago School Mathematics Project (UCSMP)" is a core mathematics curriculum that includes materials and a routinized instructional approach with an option for teacher training. The curriculum uses an inquiry-based approach with a focus on active learning where students frequently engage in hands-on activities and small-group activities. This What Works Clearinghouse (WWC) intervention report, part of the WWC's Primary Mathematics topic area, explores the effects of "UCSMP" on general mathematics and algebra outcomes. This review focuses on studies of two "UCSMP" courses that are eligible for review under the Primary Mathematics topic area: "Pre-Transition Mathematics" and "Transition Mathematics." "Pre-Transition Mathematics" teaches arithmetic, algebra, geometry, probability, and statistics. "Transition Mathematics" teaches more advanced arithmetic, algebra, and geometry, and connects these areas to measurement, probability, and statistics. The WWC identified 11 studies of these two "UCSMP" courses. Three of these studies meet WWC standards. The evidence presented in this report is from studies of the effects of "UCSMP" on students--including 3% Asian, 4% Black, 61% White, and 21% Hispanic students--in grades 6 to 9 in urban, suburban, and rural school districts. This intervention snapshot provides a brief summary of the full report. [For the full report, see ED612678. For the Intervention Brief, see ED612679.]