This article explores collective and individual perspectives onpreschool mathematics within a professional developmentprogramme. All seven teachers at one Swedish preschoolparticipated in a one-year research-based professionaldevelopment programme. At the beginning and then again at theend of the programme, the teachers collectively wrote down theirgoals for mathematics teaching at the preschool. In the article,these goals will be compared to three teachers’individual writingsduring the year. This comparison indicates that the professionaldevelopment of these teachers may have been collective, but notjoint, as the collectively written goals seem to imply slightlydifferent things for the individual teachers. Thus, what may looklike collective goals for the teaching of mathematics at onepreschool may in fact imply quite large differences in themathematics teaching of individual teachers. If collectiveprofessional development programmes are to have an impact,differences between teachers need to be made visible and, as anext step, be the basis for the development of professionallanguage as well as evaluation and planning of preschoolmathematics and further professional development.