ABSTRACT The Norwegian version of the School-Wide Positive Behaviour Support (SWPBS) model was tested in two quasi-experimental evaluation studies with 65 primary schools (grade 4–7). The impact of the N-PALS model on externalising behaviour and learning climate in class was tested at 28 elementary schools that implemented the full-scale model, while 17 schools implemented a short version with emphasis on the universal level, and 20 schools served as controls with regular practice. After 3 years, the staff at the schools implementing the full model reported significantly fewer behavioural incidents and more use of praise and encouragement compared to the staff at the control schools. And four months after the collective training of staff at schools implementing the universal short version, significantly fewer negative behavioural incidents were reported. School size and implementation quality moderated the outcomes in the two studies. In conclusion, the school-wide intervention model effectively reduced the negative behavioural incidents and improved the learning climate and social relations in the classrooms.
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