Since 2015, CORE (California Office to Reform Education) school districts have been doing districtwide surveys to measure students’ social and emotional learning (SEL). This is the first time social and emotional learning has been measured at scale, said Heather Hough, Executive Director of Policy Analysis for California Education (PACE), a nonprofit research organization. Researchers are starting to gather enough data to quantify links between the social and emotional aspects of students’ education and their academic achievement.