Here is a great video created by one of the founders of PECS, Lori Frost. The video is long at 47m 19s, but move the play cursor to 11:01 to learn about phase 1 of the PECS system. After a description of the first phase there is a video demonstrating PECS in use (13:47). Further along in the video presentation there are additional video clips of PECS use (23:48 and 34:00).
Picture Exchange Communication System or PECS for short is a low tech form of AAC (Assistive Augmentative Communication). It was created by Lori Frost and Andy Bondy. It is structured and research-based and contains 6 distinct phases of skills.
Kristin Meadows, M.S. CCC-SLP
Speech-Language Pathologist at Rockburn Elementary School in Elkridge, MD. In the past, she has taught at Ducketts Lane Elementary, Worthington Elementary, Gorman Crossing Elementary, and Elkridge Elementary. She is a certified member of the American Speech-Language-Hearing Association (ASHA) and obtained both a B.A. and M.S. from Loyola University in Maryland.