My interest in nonverbal behavior has remained constant for over 15 years. I think this has been the case because nonverbal behavior has proved a very fascinating and challenging topic. Others might suggest that I am just a slow learner. With enough time in any area, however, one begins to feel that he or she has some special insights to offer to others. About the time that I was struck with that thought, approximately two and a half years ago, I was developing the first version of my sequential functional model of nonverbal exchange. It seemed to me that the func tional model might provide a...