“…SHAPES intervention delivery improved over the 3 years, possibly due to teacher experience, interventionist experience, and/or the time needed for organizational change to take place. As is commonly reported in the literature (Alhassan & Whitt-Glover, 2014;Finch et al, 2014;Herbert et al, 2013), variability in implementation occurred over time for a given teacher and within a given school at any point in time. This variability suggests that classroom-and school-level factors influenced preschool teacher implementation, which we are investigating as a reflection of setting complexity (Craig et al, 2008;Foster-Fishman, Nowell, & Yang, 2007;Hawe, Shiell, & Riley, 2004.…”