The Picture Exchange Communication System (PECS) is an initial language-training package that is used to teach communication skills rapidly to those with limited functional speech. PECS is a unique training program that does not require lengthy prerequisite training, and promotes communication in a social context that the user initiates. Rather than building to spontaneity, as promoted by many other systems, PECS begins with spontaneous actions. The sequence of PECS phases incorporates an individual’s lack of sensitivity to socially-based reinforcers. Training in PECS begins by teaching a spontaneous request and goes on to teach additional communicative functions, such as responding to questions and commenting. An added attraction for pre-school children with autism and related disabilities is the high proportion of children who acquire independent speech after using PECS for a year or more.