The evaluation will be conducted as a cluster-randomized trial, where 37 primary schools will be randomly assigned to experimental and control groups. Schools randomized to experimental group will implement the LOG-model, while schools assign to the control group will work as previously with interprofessional collaboration. While schools in the experimental group will receive economic resources to compensate for implementing the model and participating in the research, schools randomized to control group will get, however, somewhat less financial compensation for taking part in the research. The implementation team offer supervision and support to schools randomized to the experimental group throughout the project period.