This article reports the results of an experiment that was conducted to determine the impact of media synchronicity theory (MST) training on media-fit behavior, communication quantity, communication quality, and group effectiveness. MST training introduces students to a framework for assessing a media's capabilities and matching those capabilities to a particular task. From three technical communication courses, 80 participants were randomly divided into two groups and compared using a between-subjects design. The MST training group reported significantly higher levels of media-fit behavior, communication quantity, and the communicationperformance qualities of discussion quality, richness, and openness. The