Success for All (SFA), one of the best-known school reform models, aims to improve the reading skills of all children but is especially directed at schools that serve large numbers of students from low-income families. First implemented in 1987, SFA combines a challenging reading program, whole-school reform elements, and an emphasis on continuous improvement, with the goal of ensuring that every child learns to read well in the elementary grades. This is the third and final report from an independent evaluation of the scale-up demonstration of the SFA elementary school reading program. Both the demonstration and the evaluation have been funded under the U.S. Department of Education's Investing in Innovation (i3) competition. Conducted by MDRC--a nonprofit, nonpartisan education and social policy research organization--the evaluation examines SFA's implementation and impacts in five school districts over a three-year period (the 2011-2012 school year through the 2013-2014 school year). It also includes an analysis of program costs. Finally, it considers the scale-up process itself--the methods employed and the extent to which the Success for All Foundation (SFAF), the organization that developed and provides technical assistance to schools operating the program, achieved its scale-up goals. [This report was written with Emma Alterman, Herbert Collado, and Emily Pramik. For the executive summary of this report, see ED579090. For the Early Findings report, see ED545452. For the Interim Report, see ED546642.]