This appendix provides additional details on the underlying data, statistical models, and results presented in "The Big Lift Descriptive Analyses: Progress across Three Kindergarten Classes." First the authors describe how they created each control and outcome variable and its source (e.g., parent report), followed by an overview of the…

The Big Lift™ (Big Lift) is a preschool-third-grade collective impact initiative in San Mateo County, California. The initiative is a partnership of the County of San Mateo, San Mateo County Office of Education, and the Silicon Valley Community Foundation. Launched in 2012, the initiative aims to boost children's reading proficiency by third grade…

The 1981 Basic Skills Summer School Program in Montgomery County, Maryland public schools provided intensive remedial instruction in reading, writing, and mathematics to pupils who scored very low on national standardized achievement tests. An evaluation of the program's effects found that (1) over all, participating students in grades 4-8 scored…