Effective Programs in Elementary Mathematics: A Meta-Analysis

a Marta Pellegrini, Department of Education and Psychology, University of Florence, Piazza di San Marco, 4, 50121 Firenze FI, Italy, marta.pellegrini@unifi.it; b Cynthia Lake, Center for Research and Reform in Education, Johns Hopkins University, 300 E. Joppa Rd., #500, Baltimore, MD 21286 USA, clake5@jhu.edu; c Amanda Neitzel, Center for Research and Reform in Education, Johns Hopkins University, 300 E. Joppa Rd., #500, Baltimore, MD 21286 USA, aneitzel@jhu.edu; d Robert E. Slavin, Center for Research and Reform in Education, Johns Hopkins University, 300 E. Joppa Rd., #500, Baltimore, MD 21286 USA, rslavin@jhu.edu, 410-616-2310.