Research (NCSER) supports a comprehensive research program to promote the highest quality and rigor in research on special education and related services, and to address the full range of issues facing children with disabilities, parents of children with disabilities, school personnel, and others.We strive to make our products available in a variety of formats and in language that is appropriate to a variety of audiences. You, as our customer, are the best judge of our success in communicating information effectively. If you have any comments or suggestions about this or any other NCSER product or report, we would like to hear from you. Please direct your comments to