Disability classifications is given a minor role in the Swedish national policy on special needs in schools. In the present study questionnaires are used to investigate the actual importance of medical diagnosis in obtaining special support as well as attitudes towards such practices. The study involves different levels of the educational system as well as different occupational groups within compulsory schooling and preschool. The results show that: 1) disability-based categories are seen as less needed in practice by chief education officers than by principals; 2) disability-based classifications have stronger support among school staff than in the guiding documents and among principals and chief education officers; 3) a disability-based approach has stronger support at the compulsory school level than at the preschool level; 4) the group most in favour of disability-based classifications is teachers and those most against are chief education officers, principals and SENCOs.