In this study, we share findings from a preschool intervention program using circle time games to help children practice behavioral regulation, a set of skills that lays the foundation for school readiness and academic success. We looked at how children's behaviors during intervention playgroup sessions was related to how much they benefited from the intervention and examined whether children's behaviors "spilled over" to other children's participation. Developing programs that help preschoolers practice behavioral regulation skills may help lay the foundation for early learning and later academic success. (author abstract)