The purpose of the study is to investigate which possibilities SENCos have to work with school development. By interviewing principals and sencos working in school we hope to get answer to this question. We also want to find out how SENCos may contribute to develop “a school for all” by implement the special educational perspective. The study is based on following questions; How do principals and SENCos define school development? Which function does the SENCo have in the school development work? Which possibilities does the SENCo have to work with school development whether he or she is a part of the management? How does the SENCo contribute with the special educational perspective in “a school for all”? Theoretical perspectives in the study are organization research and system theoretical perspective. The study is based on a qualitative method with semi structured interviews with principals and SENCos. The result has been interpreted by a hermeneutic theoretical approach. Our research may contribute to clarifying the complex role of the SENCo in school development questions. Both principals and SENCos discloses the definition of school development to be extensive and difficult to describe. The role SENCo may have in questions about school development is dependent of the principals leadership and wich background the SENCo have, it may also vary over time according to school needs. The result shows that it is not obvious that the SENCo participate in the management, but the conclusion is that when they do, their influence in school development questions appears to be more of a strategic role. The SENCos in this research do feel that they work with questions about school development unlike the saying of previous research. The important role of SENCos by giving all students the best presumptions is underlined by all of the interviewed principals. The study ends with a discussion where the result is problematized by earlier research and suggestions of further research is also given.