“…Many studies find that pre-K programs improve children's academic skills (literacy, language and math), cognition, and test scores (Weiland and Yoshikawa, 2013;Gormley and Gayer, 2005;Fitzpartick, 2008;Lipsey et al, 2013;Wong et al, 2008;Cascio and Schanzenbach, 2013;Hill, Gormley, and Adelstein, 2015;Gormley, Phillips, and Gayer, 2008) in the short run, but often find these effects fade out over time. Studies also find that these programs increase the frequency of screenings for developmental delays and chronic conditions (Zigler, Piotrkowski, and Collins, 1994;Janvier et al, 2016), which may enable better outcomes in subsequent years. However, studies of early childhood programs also find that early exposure to other children may have deleterious effects.…”