This book is designed as a college-level textbook introducing readers to all aspects of intellectual disability in children, from birth to the end of schooling, with an educational focus. The book will be of interest to persons training as special education teachers or who are training as regular teachers with a focus on special education. It will also be relevant reading for parents of children with intellectual disability, for practicing teachers, and for other professionals working with such children (psychologists, social workers, nurses, therapists). The field of special education and intellectual disability practice has been strongly influenced by legislation in the United States. The United States is also the source of most research in the disability field. For this reason, there is an emphasis in this book on research and practice in the United States. However, there is also coverage of research and practice in Australia (where the author is located); the UK, where there are several leading research groups; and other parts of the world. This book provides readers with up-to-date information on the latest research on the identification and definition of intellectual disability, assessment of intellectual disability and adaptive behavior, causes of intellectual disability, educational options and alternatives, early intervention for young children with intellectual disability, and practical approaches to teaching and intervention. In the final chapter, the author reviews options for students at the end of their formal schooling.