This report suggests that evidence-based approaches can improve 3-year-olds’ social-emotional competence in mixed-age preschool classrooms. While the findings are promising, further research is needed to confirm the results and to better understand how these benefits are generated.

This paper makes valuable contributions to the literature on multiple-rating regression discontinuity designs (MRRDDs). It makes concrete recommendations for choosing among existing MRRDD estimation methods, for implementing any chosen method using local linear regression, and for providing accurate statistical inferences.

The city’s small, academically nonselective high schools have substantially improved graduation rates for disadvantaged students. This report demonstrates that, because more of their students graduate and do so within four years, the schools have lower costs per graduate than the schools their study counterparts attended.

This program provides an incentive for developmental math students to take their math courses early and consecutively, get help in an on-campus Math Lab, and strive for passing grades or better, in exchange for a modest performance-based scholarship. Compared with standard services, the program’s effects are modest but positive.