Research in Autism Spectrum Disorders, 7, 480‐493.
Abstract: An experimental, single‐subject research study investigated the comparative efficacy of the Picture Exchange Communication System (PECS) versus a speech‐generating device (SGD) in developing requesting skills for three elementary‐age children with severe autism and little to no functional speech. Lee Mas...
Boesch, M., Wendt, O., Subramanian, A. & Hsu, N. (2013). Comparative efficacy of the Picture Exchange Communication System (PECS) versus a speech‐generating device: Effects on requesting.