In 2010, the province of Ontario introduced a new universal two-year play-based full-day kindergarten program. The authors exploited the phasing-in of this program over five years, allowing a natural experiment in which children from full-day kindergarten could be compared with those from half-day kindergarten in matched neighborhoods. Children (N…

Research Findings: Students experienced a mindfulness program designed to enhance their self-regulation in prekindergarten and kindergarten. At the end of the 1st year of the program, these students showed improvements in teacher-reported executive function skills, specifically related to working memory and planning and organizing, whereas…