... The extant research on full-day kindergarten is inconclusive regarding short-term, long-term, and longitudinal outcomes for students. Many studies reported more positive outcomes for children in full-day kindergarten compared to those in half-day (Baskett, Bryant, White, & Rhoads, 2005;Cryan, Sheehan, Wiechel, & Bandy-Hedden, 1992;Fusaro, 1997); specifically, higher achievement in literacy and math was found (Gullo, 2000;Lee, Burkam, Ready, Honigman, & Meisels, 2006;Weiss & Offenberg, 2002;Zvoch, Reynolds, & Parker, 2008). But other researchers identified methodological limitations in these earlier studies in terms of sample size, selection bias, and duration of outcome periods (Canon, Jacknowitz, & Painter, 2006;Cryan et al., 1992;Puelo, 1988). ...