PROTOCOL: School-based interventions for reducing disciplinary school exclusion: An updated systematic review.

The primary goal of the present mixed methods review is to systematically examine the available evidence for the effectiveness of different types of school-based interventions for reducing disciplinary school exclusion. Quantitative evidence will help to understand the overall size of the impact, as well as the factors that better explain it. Qualitative evidence will help to better understand how these programmes may work, and what factors aid or hinder implementation and success. The research questions underlying the quantitative review are as follows: Do school-based programmes reduce the use of exclusionary sanctions in schools?Are some school-based approaches more effective than others in reducing exclusionary sanctions?Do participants' characteristics (e.g., age, sex, or ethnicity) affect the impact of school-based programmes on exclusionary sanctions in schools?Do characteristics of the interventions, implementation, and methodology affect the impact of school-based programmes on exclusionary sanctions in schools?Do school-based programmes have an impact on reducing the involvement of children and young people in crime and violence?Do participants' characteristics (e.g., age, gender, ethnicity) affect the impact of school-based programmes on crime and violence? If sufficient data are available, we will compare different approaches (e.g., school-wide management, classroom management, restorative justice, cognitive-behavioural interventions) and identify those that could potentially demonstrate larger effects. We will also (potentially) run analysis controlling for characteristics of