A number of states have taken steps toward promoting student wellness, with many of their state boards of education in the middle of the action. This article contains some examples of states leading on student wellness by addressing physical fitness, social and emotional learning (SEL), and mental health supports. The Every Student Succeeds Act…

Background: Cluster-randomized experiments that assign intact groups such as schools or school districts to treatment conditions are increasingly common in educational research. Such experiments are inherently multilevel designs whose sensitivity (statistical power and precision of estimates) depends on the variance decomposition across levels.…