Abstract: Computer-mediated communication (CMC) has been viewed as overcoming process losses in groups by fostering equal participation in discussions. This study examines antecedents of participation and tests the hypothesis that the benefit of the equalization effect depends on how information is distributed within the group. Fifty-four, 3-person groups worked on a problem-solving task either in computer conferences or face-to-face meetings. Six additional pieces of information (clues) were distributed equally across members or to single member. In contrast to ideas that electronic communication reduces inhibitions, participation in CMC was associated with individual differences in extraversion. In addition, despite more equal participation in CMC, individuals dominated in both media conditions. Media had few effects on information sharing or performance. Results of this and other studies of group problem solving suggest that patterns of interaction and performance in computer-mediated groups do not depart substantially from face-to-face groups and that CMC may introduce new process losses.