Children with complex and severe communication impairments often cannot meet their communication needs with their natural voice and may require the use of augmentative and alternative communication (AAC). There are many communication and learning challenges facing children who use AAC; however, using AAC for social communication is especially…

The communication of people with autism spectrum disorder (ASD) is characterized by a qualitative impairment in verbal and non-verbal communication. In past decades a growing body of descriptive studies has appeared on language and communication problems in ASD. Reviews suggest that the development of formal and semantic aspects is relatively…