Literature is reviewed on augmentative and alternative communication research and intervention for individuals with severe intellectual disabilities. The review focuses on prerequisites for intervention, symbol systems and sets, computer technology, and teaching strategies. Future research directions are outlined, and clinical and educational…

The word-learning ability of 12 school-age subjects with moderate or severe mental retardation was assessed. Subjects used the System for Augmenting Language with visual-graphic symbols for communication. Ability to fast map novel symbols was found to relate to symbol achievement status. Implications for vocabulary acquisition by youth with mental…

Three of four severely retarded adolescents and young adults learned to use computer-based lexigrams to request foods and, subsequently, objects. Additional request experience with lexigrams resulted in consistent improvement on labeling and comprehension tasks, emergence of subject-initiated lexigram communications, and facilitation of spoken…