The pace of research on Autism Spectrum Disorders (ASD) can only be described as extraor‐ dinary as this volume shows. It is extremely difficult for any single professional to keep abreast of all the developments in this area. This volume gathers together leading research‐ ers and expert clinicians from many different parts of the world to produce this "up-to-the- minute" volume. It gives an in depth view of many areas of research which may be unfamiliar.