“…Content-specific curricula often supplement a classroom’s regular curriculum (e.g., Creative Curriculum or a teacher or locally-developed curriculum) and provide instruction through developmentally-sound “free play” and exploration activities in small or large groups, or individually (Wasik and Hindman 2011). Random-assignment evaluations of content-specific curricula focusing on language, mathematics, and socioemotional skills often find positive impacts on their targeted sets of skills (Bierman, Nix, et al 2008, Bierman, Domitrovich, et al 2008, Clements and Sarama 2008, Fantuzzo, Gadsden, and McDermott 2011, Klein et al 2008, Diamond et al 2007, Morris et al 2014). For example, children who received a curriculum targeting literacy showed improvements in their literacy and language skills (Justice et al 2010, Lonigan et al 2011).…”