Various aspects of nonverbal communication are discussed in this paper, and the questions of how and why to teach it are considered. It is suggested that the nonverbal field can be roughly divided into three domains, in terms of method and the nature of the questions asked. Albert Scheflen and several other "nonverbal structuralists" are interested in studying whole communication systems, to see how all communicational elements--verbal and nonverbal--are coordinated. The external variable approach (Duncan 1969) investigates systematic relationships between nonverbal behavior and something else: psychological states, perception of meaning, or interpersonal outcomes. A third kind of research related to the study of personality is concerned with individual differences in nonverbal behavior. Some of the research related to nonverbal communication is summarized, and ethical problems associated with analyses of nonverbal communication are briefly discussed. (LL)