This appendix provides additional details on the underlying data, statistical models, and results presented in the main report. We first describe how we created each control and outcome variable and its source (e.g., parent report), followed by an overview of the logistic regression models employed, and then provide the full set of results from…

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…

Reading is an important part of the modern child's environment. The number of things one must know about in order to understand this world has been enormously increased. No one can hope to learn of them all through first-hand experiences. Printed matter, which preserves and facilitates widespread distribution of knowledge, becomes a necessity. To…