My research interests are in the area of applied behavior analysis and early childhood special education. Specifically, I am interested in understanding what instructional strategies and environmental arrangements are most effective in facilitating the learning of young children with autism and related disabilities. My research involves identifying and validating instructional strategies for children with autism and other significant disabilities and in understanding how to teach teachers and others to implement these strategies with high fidelity. I am also interested in issues related to social relationships of young children with disabilities, inclusion, applied behavior analysis, and social validity. In 1997, my colleagues and I started Project DATA, a school-based early intervention program for children with autism. Research about Project DATA integrates my interests in program effectiveness, implementation, and inclusive education.