The second edition of the benchmark reference Since its first edition, this handbook has become the most influential reference work in the field of autism and related conditions. Now expanded to two volumes, this comprehensive work provides a thorough review of these disorders, drawing on findings and clinical experience from a number of related disciplines. The Second Edition covers all current treatment models, and is updated to include new methods for screening and assessment, genetic components, and school-based interventions. All chapters have been thoroughly updated; two-thirds of chapters are entirely new to this edition. VolumeTwo includes the newest, most authoritative information available on assessment, interventions, and policy ramifications surrounding pervasive developmental disorders.