Part 1 Early Recognition and Diagnosis Chapter 1 Early Detection of Autism Spectrum Disorders Part 2 Nosology and Diagnostic Criteria: Chapter 2 Pervasive Developmental Disorder- not Otherwise Specified: Specifying and Differentiating Koray Karabekiroglu Chapter 3 Autism and Genetic Syndromes Willem Verhoeven, Jos Egger and Ilse Feenstra Part 3 Genetics and Pathophysiology of Autism Spectrum Disorders Chapter 4 The Genetics of Autism Spectrum Disorders Chapter 5 Genetic Heterogeneity of Autism Spectrum Disorders Catherine Croft Swanwick, Chapter 6 The Genetic Basis of Phenotypic Diversity: Autism as an Extreme Chapter 7 A New Genetic Mechanism for Autism Chapter 8 Common Genetic Etiologies and Biological Pathways Shared Between Autism Spectrum Disorders and Intellectual Disabilities Part 4 Treatment and Genetic Counseling Chapter 9 Microgenetic Approach to Therapy of Girls with ASD Chapter 10 Genetic Counseling in Autistic Phenotypes