This report presents implementation findings on the topic of program supports from the perspective of Pre-K for All site administrators and instructional staff. Program supports include the various types of training, preparation, resources, and materials that were provided to Pre-K for All sites in 2014-15 to help them implement the program. Sources of data include surveys of site administrators and instructional staff from a sample of 201 sites, and in-depth interviews with administrators and staff at 40 of these sites, as well as a review of available documentation. The sites included in the study were sampled to be representative of all Pre-K for all sites and recruited to participate in the evaluation. Findings are based on self-reported data; the provision and use of program supports was not directly observed. Survey response rates were 91 percent for site administrators and 69 percent for instructional staff. (author abstract)