As evidence becomes increasingly important in educational policy, it is essential to understand how research design might contribute to reported effect sizes in experiments evaluating educational programs. A total of 645 studies from 12 recent reviews of evaluations of preschool, reading, mathematics, and science programs were studied. Effect…

Motivational interviewing (MI) is a brief client-centred intervention that increases intrinsic motivation for change. Little research has been conducted on MI to promote academic behaviours, but two studies found that one session of MI did improve middle-school students' math grades [Strait, G., Smith, B., McQuillin, S., Terry, J., Swan, S., &…

The authors evaluated the effects of P-SELL, a science curricular and professional development intervention for fifth-grade students with a focus on English language learners (ELLs). Using a randomized controlled trial design with 33 treatment and 33 control schools across three school districts in one state, we found significant and meaningfully…