In order to avoid contradictory roles, an implementation team is responsible for developing and implementing the intervention, while the research team conduct an independent evaluation. The model will be evaluated by a cluster-randomized design to evaluate the effectiveness of the intervention. The hypothesis is that schools that utilize the process-based intervention (intervention group) will improve their interprofessional team work in a way that enhances the pupil's learning- environment and teachers professional competence, self-efficacy and efficient use of working hours compared to their counterparts in the control group. We anticipate main effects to be found at pupil level, mainly through improved early assessment, intervention and efficient follow-up. The project is a collaboration between four Norwegian municipalities and includes a total of 37 Schools, half of which will be randomized to experimental condition and half to control condition.