Community School District 23 (CSD 23) in Region 5 of the New York City public schools serves students who reside in central Brooklyn. The district enrolls approximately 12,800 students in grades K-8 in 18 schools. Scholastic READ 180 is one of several reading interventions that the district is using to improve student performance. The staff of District 23 and Scholastic asked Policy Studies Associates to assist in the analysis of data on end-of-year tests in reading and language arts (ELA) administered by the New York State Department of Education (SDE) and the New York City Department of Education (DOE) as part of an effort to identify the contribution of READ 180 in changing student performance. That analysis is the focus of this report.