Autism spectrum disorder (ASD) refers to a type of condition, associated with brain development that affects how a person perceives and interacts with others. This condition can create difficulties in social interaction and communication. It also involves recurring and limited behavioral patterns. The risk factors of ASD include family history, preterm births, the child's gender, the age of the parents, etc. ASD is diagnosed by a thorough examination of a person's behavior and growth, and it is typically diagnosed by the age of two. The most successful therapies of ASD include occupational therapy, physical therapy, applied behavioral analysis, pharmacological therapy and speech therapy. The goal of the treatment is to reduce the negative effects and related deficits of ASD. The treatment also emphasizes on increasing functional independence and quality of life. This book contains some path-breaking studies on autism spectrum disorder. It provides significant information to help develop a good understanding of this medical condition. The extensive content of this book provides the readers with a thorough understanding of the condition.