Children and youth with autism spectrum disorders (ASD) and other developmental delays frequently experience deficits in functional communication. Identifying and using suitable communication enhancement and augmentative and alternative communication supports is essential to achievement of positive outcomes for these learners. This article discusses the use of the Picture Exchange Communication System (PECS), a commonly used and utilitarian AAC system for children and youth who lack sufficient functional communication skills. Particular attention is given to practitioners' use of this promising tool.