“…The early work on decision development (see, for example, Fisher, 1970aFisher, , 1970bGouran & Baird, 1972;Leathers, 1969Leathers, , 1970Stech, 1975) and later extensions to the relational aspects of communication (e.g., Ellis, 1979;Ellis & Fisher, 1975;Fisher, Drecksel, & Werbel, 1978) reflected the assumption that interaction at any given point is almost exclusively a function of the utterances that have preceded and a major determinant of those that follow. In short, those conducting studies began to treat group communication as if it represented some sort of closed system, with virtually everything that occurs being accounted for by the characteristics of utterances.…”