Autism Spectrum Disorder is a developmental disability significantly affecting verbal and nonverbal communication and social interaction, generally evident before age three that adversely affects a child’s educational performance. Other characteristics often associated with autism are engagement in repetitive activities and stereotyped movements, resistance to environmental change or change in daily routines, and unusual responses to sensory experiences. This impairment may include: Autistic Disorder, Pervasive Developmental Disorder-Not Otherwise Specified (Atypical Autism), Asperger’s Disorder, Rett’s Disorder, Childhood Disintegrative Disorder or all Pervasive Developmental Disorders. Autism does not apply if a child’s educational performance is adversely affected primarily because the child has an emotional disability.