Autism spectrum disorder (ASD) is a developmental disorder defined by difficulties in social interaction and communication, and by restricted and repetitive behavior. Signs typically appear in early childhood and affect a person's ability to communicate and interact socially. The diagnostic criteria for ASD include persistent deficits in social communication and interactions, as well as restricted, repetitive behaviors and interests. Effective interventions for students with ASD focus on behavior modification, applied behavior analysis, social skills training, and use of visual supports and schedules to improve academic engagement and learning.