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The Picture Exchange Communication System (PECS) is described by its authors as a unique AAC training package developed for use with young children with autism and other social-communication deficits. (Frost & Brody 1994).he Picture Exchange Communication System (PECS) is described by its authors as a unique AAC training package developed for use with young children with autism and other social-communication deficits. (Frost & Brody 1994).