Interteach is a national Swedish research project, which focuses on Evidence-Based Teaching Programs regarding language and interaction in Swedish special schools. It is a full population study, which means a survey was sent out to all teachers in Sweden who are qualified to teach in the Swedish special schools regarding pupils with intellectual disabilities. Followup studies with interviews and observations are planned for. The purpose of the study is more specifically to identify what teaching programs are used within Swedish special schools, and to what extent, in order to promote language and interaction regarding pupils with intellectual disabilities, ID (including Autism Spectrum Condition with ID). Our hope is that increased knowledge within these aspects can lead to development of the education in this area. To our knowledge this is the first Swedish study that studies Evidence-Based Practice in all Swedish special schools