For decades special schools have been the pivot of the education of pupils with special needs. In quite a number of countries in the Western world, educators and administrators have put a great deal of effort into the development of a thorough and widely accepted system of special schools. In these schools all the available expertise has been concentrated in an attempt to educate pupils with special needs in the best way. Because of the unusual, special instruction provided in these schools many function as separate, independent schools. Since the 1920s the separate system for special education has been enlarged and refined.