REFERENCES
- Beukelman, D. (1991). The cost of communicative competence. Augmentative and Alternative Communication, 7, 2-11. (Based upon the Phonic Ear AAC Distinguished Lecture presented at the Biennial ISAAC Conference, Stockholm, Sweden, August 16, 1990.)
- Light, J. (1990). Message encoding techniques for augmentative communication systems: An investigation of the recall perfor-mances of nonspeaking physically disabled adults. Doctoral dis-sertation, University of Toronto, Toronto, Canada.
- Light, J., Lindsay, P., Siegel, L., & Parnes, P. (1990). The effects of message encoding techniques on recall by literate adults using AAC systems. Augmentative and Alternative Communication, 6, 184–202.
- Williams, M. B. (1991). Message encoding: A comment on Light et al. (1990). Augmentative and Alternative Communication, 7, 133–134.