1. Human Services Research Institute, Cambridge, MA
2. National Association of State Directors of Developmental Disabilities Services, Alexandria, VA
3. U.S. Department of Education, National Institute on Disability and Rehabilitation Research, Washington, DC
4. The University of Sydney, Faculty of Health Sciences, Lidcombe, New South Wales, Australia
5. University of Minnesota, Research and Training Center on Community Living, Minneapolis, MN
6. University of Delaware, Department of Human Development and Family Studies, Newark, DE