This report, based on a four-year study of day schools that are introducing and implementing blended learning practices with support from The AVI CHAI Foundation, presents overall patterns of these schools’ goals and progress. Between fall 2012 and spring 2016, we visited schools, usually for two days of observing classes across grade levels and subjects and conducting interviews with teachers and administrators. We studied 23 schools, visited 80 classrooms, interviewed 120 teachers and administrators, and reviewed dozens of school and classroom documents in print and online. We also spoke with program providers and funders and tried out many of the online sites and programs the schools were using.