The Implementation Study was designed to examine local variations in the statewide implementation of PA PKC in relation to the program regulations and early learning standards. The study entailed surveys with three groups of families (current PA PKC families, former PA PKC families in kindergarten, comparison families in kindergarten), surveys and interviews with PA PKC administrators, and PA PKC administrative data. This process evaluation focused on issues related to the extent of variability in implementation of PA PKC, effectiveness of family engagement, adequacy of supports for continuous quality improvement, and implementation challenges in supporting children's school readiness.