The document discusses autism spectrum disorder (ASD). It notes that ASD is the most prevalent childhood development disorder in the US, affecting about 1 in 88 children. ASD impairs communication, social skills, and relationship formation. There is no known cause or cure. Early intervention is important but symptoms may still persist into adulthood. The document provides an overview of the different types of ASD diagnoses and their characteristics. It also discusses prevalence, risk factors, early signs, and classroom accommodations for students with ASD.