Fillipin, M., Reszka, S. & Watson, L. (2010). Effectiveness of the Picture Exchange Communication System (PECS) on communication and speech for children with autism spectrum disorders: A Metanalysis.

American Journal of Speech‐Language Pathology. (Online version).
Abstract: Purpose: The Picture Exchange Communication System (PECS) is a popular communication training program for young children with autism spectrum disorders (ASD). This metanalysis reviews the current empirical evidence for PECS in impacting communication and speech outcomes for children with ASD. Methods: A systematic review of the literature on PECS written between 1994 and June 2009 was conducted. Lee Mas...