Background: School climate is crucial: its character can affect pupils' academic achievement, teachers' working conditions and the wellbeing of everyone at school. A major concern for teachers is how to prevent and manage disruptive behaviours. Against this backdrop, there is a need for thorough investigation of pupils' perspectives to better…

This study reports the results from a Swedish randomized controlled trial of a standardized behavior management intervention. The intervention targeted students with externalizing behavior in a regular education setting. First- and second-grade students (N = 100) from 38 schools were randomly assigned to either the intervention or an active…

Twin children from Australia, Scandinavia, and the United States were assessed for inattention, hyperactivity-impulsivity, and reading across the first 3 school years. Univariate behavior-genetic analyses indicated substantial heritability for all three variables in all years. Longitudinal analyses showed one genetic source operating across the…