Ninety-three college students discussed four case studies using two CMC modes--synchronous and asynchronous. Students completed a questionnaire that assessed: 1) perceptions and preferences with respect to CMC mode, 2) the personality characteristic of introversion-extroversion, and 3) previous experience using the Internet. Approximately 40% of students preferred synchronous chat rather than asynchronous discussion, 60% preferred face-to-face rather than synchronous chat, and 70% preferred face-to-face rather than asynchronous discussion. Introversion-extroversion was not related to student preference for synchronous chat versus asynchronous discussion but those who preferred face-to-face discussion were less extroverted than students who expressed the alternate preference. In general, students who preferred asynchronous chat had more experience with the Internet than students who preferred asynchronous discussion. Implications for e-learning are provided. (Contains 4 tables.)