A strategy for research on the use of nonvocal systems of communication.

This paper discusses problems with current research on the use of nonvocal communication systems with special reference to the severely and profoundly mentally retarded. A strategy for research, designed to provide a method whereby critical practical and theoretical issues can be isolated, is described. The approach involves surveys of use, development of procedures for assessment and program monitoring, the development of teaching methods for use with neglected groups, and experimental investigations of the interaction of system variables and subject characteristics. The strategy is illustrated with examples from ongoing research.