This document discusses the intersection of autism and deafness in children, and the benefits of teaching sign language. It notes that deafness occurs more often in children with autism, but the conditions are often misdiagnosed due to masking behaviors. The language gap that results when a child goes years without communication can be damaging. However, studies have found that teaching sign language via applied behavior analysis techniques can improve communication and reduce behavioral issues for nonverbal autistic children. Structured teaching with visual supports and a focus on reinforcement have been shown to effectively establish sign language skills.