Following the Ministry of Social Affairs legislation, students with ADHD are offered private treatment in special schools when education and treatment is not possible in public schools. Each student is individually evaluated by Social Service officials before being offered private treatment. When the student´s parents and the Social Service Department first consider Behandlingsskolerne as an option, the student´s files are send to the school and a meeting is held between the parents, officials and the school. Taking into consideration the diagnosis, the school history and recommendations from the family, the student is placed in a school unit within the organization - one that is judged able to meet the student´s unique needs. The study will consider each student enlisted in these three school units between the dates 01.03.17 and 01.09.18. Students meeting the inclusion and exclusion criteria will be take part in the study.