Reflecting the enormous changes that have taken place in our knowledge and understanding of developmental disorders, this groundbreaking international volume brings this vast and complex field together for the first time. The editors have collected together the world’s leading academic scholars and clinicians, to explore how current research across a range of different disciplines can inform academic knowledge and clinical practice and help to improve the lives of individuals and their families.The SAGE Handbook of Developmental Disorders is a central reference in the field for all academics, researchers, clinicians and advanced students involved in the study of developmental disorders, including those in clinical psychology, child psychiatry, child mental health, child genetics and pediatrics, speech language pathology, and developmental disabilities and special education.




Profound changes have occurred in the science and practice of intellectual disability over the past two decades. Apart from the change in terminology from ‘mental retardation’ to ‘intellectual disability’ (Schalock et al., 2007), progress in basic science and clinical practice has shifted the landscape— motivating us to commission leading scholars worldwide to contribute to this volume in order to capture the current state of knowledge and point to new areas of enquiry in the decades ahead.


The last decade has seen a revolution in our knowledge about the genetic basis of intellectual and neurodevelopmental disorders. From the discovery in the late 1950s that trisomy of chromosome 21 was the cause of Down syndrome (Fidler & Daunhauer, Chapter 1), through the knowledge that fragile X syndrome ...

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