Julia Scherba de Valenzuela, Ph.D.
"Any act by which one person
gives to or receives from another person information about that person's
needs, desires, perceptions, knowledge, or affective states. Communication
may be intentional or unintentional, may involve conventional or unconventional
signals, may take linguistic or nonlinguistic forms, and may occur through
spoken or other modes."
(National Joint Committee for the Communicative
Needs of Persons with Severe Disabilities, 1992, p. 2)