Previous research on the interpersonal tone of cornputer-mediated communication shows diferent effects using longitudinal computer-mediatedgroups thanare found in research using one-shot groups, even before the developmental aspects associated with time can acmue. One factor distinguishing these approaches is the anticipation offuture interaction experienced by longitudinal groups. This research reports an experiment assessing the relative effects of anticipatedfuture interaction and direrent communication media (computer-mediated versus face-to-face communication) on the communication of relational intimacy and composure. Asynchronous and synchronous computer conferencing and face-to-face groups were exam- ined. Results show that the assignment of long-term versus short-term partnerships has a larger impact on anticipatedfuture interaction reported by computer-mediated, rather than face-to-face, partners. Evidence also shows that anticipation is a more potent predictor of several relational communication dimensions than is communication condition. Implications for the0 y and practice are identified.