PECS was first implemented with pre-school students diagnosed with autism at the Delaware Autism Program. Since then, PECS has successfully been implemented worldwide with thousands of learners of all ages who have various cognitive, physical and communication challenges.
PECS consists of six phases and begins by teaching an individual to give a single picture of a desired item or action to a “communicative partner” who immediately honours the exchange as a request. The system goes on to teach discrimination of pictures and how to put them together in sentences. In the more advanced phases, individuals are taught to use modifiers, answer questions and comment.