A broad perspective on child development is important to understanding collaboration in special education. Bronfenbrenner's ecological model of human development provides a backdrop to this case study of collaboration on behalf of Cassie, a 4-year-old child with disabilities in a small West Virginia community. The story of Cassie and her family is used to examine special education in a socio-cultural context. The implications of the research for special education in general and professional development in particular are discussed.