"University of Chicago School Mathematics Project (UCSMP) Algebra," designed to increase students' skills in algebra, is appropriate for students in grades 7-10, depending on the students' incoming knowledge. This one-year course highlights applications, uses statistics and geometry to develop the algebra of linear equations and inequalities, and includes probability concepts in conjunction with algebraic fractions. The curriculum emphasizes graphing, while manipulation with rational algebraic expressions is delayed until later courses. This curriculum uses the "UCSMP" textbook. The What Works Clearinghouse (WWC) reviewed three studies on "UCSMP Algebra." Of these, two studies met WWC evidence standards with reservations and one study did not meet WWC evidence screens. One study of "UCSMP Algebra" first edition, comparing it with "Saxon Math," and one study of "UCSMP Algebra" second edition, comparing it to traditional curricula, met WWC evidence standards with reservations. The two studies included more than 200 middle- and high-school students in four rural, suburban, and urban districts in the West, Midwest, Northeast, and South. Based on the results of these two studies, the WWC found potentially positive effects on students' math achievement. (Contains 10 footnotes.) [This publication was produced by the What Works Clearinghouse. The following studies are reviewed in this intervention report: (1) Peters, K. G. (1992). "Skill performance comparability of two algebra programs on an eighth-grade population." Unpublished doctoral dissertation, University of Nebraska, Lincoln, NE; and (2) Thompson, D. R., Senk, S. L., Witonsky, D., Usiskin, Z., & Kaeley, G. (2006). "An evaluation of the second edition of UCSMP Algebra." Chicago: University of Chicago School Mathematics Project.]