[First paragraph] Starting in the early 90s, augmentative and alternative communication (AAC) devices were introduced in special education classrooms. These devices were intended to replace the picture-based communication approaches, such as PECS (Picture Exchange Communication System).
Original Publication Citation
De Leo, G., Lubas, M., & Mitchell, J. (2012). Lack of communication even when using alternative and augmentative communication devices: Are we forgetting about the three components of language. Autism-Open Access, 2(2), 1-2. doi:10.4172/2165-7890.1000e109
Leo, Gianluca De; Lubas, Margaret; and Mitchell, Jennifer R., "Lack of Communication Even When Using Alternative and Augmentative Communication Devices: Are We Forgetting About the Three Components of Language" (2012). VMASC Publications. 36.