Teachers, speech and language therapists, teaching assistants and nursery nurses are required to work together in a range of contexts in Foundation Stage (FS) school settings in the UK. In some cases these groups of practitioners are mutually involved in the implementation of a strategy or intervention and in the use of a particular tool or resource with children in these settings. The use of graphic symbols with children in the FS of education is increasingly common in mainstream and special school settings and is an activity that may involve any combination of practitioners in these professional groups. Graphic symbols are used with a wide range of children for a diverse range of purposes. A study was conducted in which the experiences of teachers, speech and language therapists, teaching assistants and nursery nurses using graphic symbols in FS school settings were explored. Practitioners in each of these groups working in the East Midlands region of the UK were interviewed about their experiences of using graphic symbols. The findings of this study encompassed a thematic framework and theoretical model depicting the patterns and themes emerging in the practitioners' accounts. The proposed theoretical model suggests that practitioners are influenced by their unique professional reasoning processes, as well as the ways they perceive their own professional role and the roles of others. This article introduces the proposed theoretical model reflecting the factors influencing the collaborative implementation of graphic symbols in these FS school settings. Implications for collaborative practice in schools are considered. (Contains 6 figures.)