The primary aim of the study is to investigate the effectiveness of professional teacher development for a group of teachers at full-service schools (FSSs), who are the implementers of inclusive education according to Education White Paper 6, the inclusive education policy in South Africa. The researcher used ontological and epistemological assumptions, as well as specific social research methodologies. This created a scientific grounding for the findings of the study. The methodology included a qualitative research approach and research design. Focus group interviews and observation were used for data collection. In this study purposive sampling was used. The participants in this study were chosen because of their teaching experience at full-service schools; sampling was therefore done with a purpose. Phenomenology is used in the study to decide what happens in the lived experiences of the focus group interviewees, who were teachers at full-service schools. This helped the researcher to better understand the needs and problems of the participants. During qualitative data analysis the information was organised, arranged and prepared systematically and classified into themes and categories and then coding followed. The analysis showed that in the absence of an appropriate model for professional teacher development for FSSs, the teachers at the schools were not in a position to implement inclusive education adequately. The researcher proposes a framework that is based on the ecological systems theory of Bronfenbrenner, taking the intervention collaborative framework designed by the researcher based on findings and recommendations into consideration. The collaboration among stakeholders in the different levels would encourage teamwork in the development of the FSS teacher. The full-service school teacher is influenced by various elements, the learner with diverse needs in the classroom, members of the management team, the school-based support team and colleagues at school. Members of the district-based support team, the school governing body, as well as members from the wider school community all have an influence on a teacher’s development as a professional person. / Inclusive Education / D. Ed. (Inclusive Education)