“…The curricular materials include an evidence-based math curriculum called Building Blocks (BB; Sarama et al, 2008) and a research-based Pre-K for All (PKA) Interdisciplinary Units of Study (Units 1 ) developed by the Division of Early Childhood Education at New York's Department of Education (DECE-DOE). The decision to create a PD track that incorporated a math-focused curriculum was based on evidence that (1) preschool children's math skills are foundational for a broader set of outcomes, including language, reading, and executive function (e.g., Duncan et al, 2007;Watts et al, 2014); (2) preschool math instruction is likely minimal-in terms of the dosage of math instruction and the quality of instruction (Ginsburg et al, 2008); and (3) preschool children's math competencies can increase by training teachers using an evidencebased curriculum with supports (Clements & Sarama, 2007;Presser et al, 2012). Furthermore, because a researcher-led efficacy study of BB called Making Pre-K Count (MPC) in New York City (NYC) took place a few years earlier, there was increased interest in expanding to more sites.…”