C ommunication is an ancient discipline which has evolved considerably. Throughout this evolutionary process, effectiveness has been a central concern. In the fifth century BC, for instance, Corax, one of the first teachers of human discourse, suggested the need for speakers to &dquo;produce an effect in listeners&dquo; (Hinks, 1940;Kennedy, 1959 (1973) suggests that theory construction in the future should &dquo;focus on a new set of variables and employ a new set of analytic techniques&dquo; (p. 16).