The aim of this study is to describe the variation in two teachers perceptions of their work with individual developments. The study begins with a review of the Swedish National Agency for Education?s guidelines for working with individual developments. With this I want to give the reader an insight into the teachers working conditions and the responsibilities the school authorities have against their students. Using phenomenography, I have examined the differences between two mathematic teacher?s perceptions in working with individual developments for student?s in need of special education.   My questions are: How do mathemathic teachers perceive their work with individual developments? What support and what information do the teacher?s feel that they have been given in order to use individual developments as a tool? How do the teachers perceive that their work situation has influenced their work with individual developments? The two teachers I have interviewed showed different perceptions both in how they understood the guidelines for working with individual developments and how they chose to work with them.