Book excerpt: This book presents the similarities and intersections between Autism Spectrum Disorders and comorbid conditions in children. It describes the prevalence and magnitude of comorbid conditions occurring in conjunction with ASD that complicate diagnosis and can potentially lead to inappropriate treatment and negative outcomes. It addresses the strengths and limitations of age-appropriate assessment measures as well as activity and motor skill measurement methods. Specific comorbid disorders are examined through the review of core symptoms, prognostic and diagnostic issues and treatment options for children on the ASD spectrum. Featured topics include: Challenging behaviors in children with ASD. Conditions ranging from feeding and gastrointestinal disorders to epilepsy. Developmental coordination disorder (DCD). Intellectual disability (ID). Methods and procedures for measuring comorbid psychological, medical and motor disorders. Comorbid Conditions Among Children with Autism Spectrum Disorders is a must-have resource for researchers, clinicians and professionals and graduate students across such fields as clinical child, school and developmental psychology, child and adolescent psychiatry and social work as well as rehabilitation medicine/therapy, behavioral therapy, pediatrics and educational psychology.