Several quasi-experimental and experimental studies of learning outcomes associated with Oral Communication across the Curriculum (OCXC) activities have been conducted at Radford University, Virginia. Two such studies assessing the effectiveness of OCXC in non-speech courses highlight the difficulties involved in conducting research into course-content learning related to oral communication activities in communication-intensive courses. Four other studies sought to determine if interactive multimedia instruction (IMI) in oral communication enhanced oral communication competence. The most important outcome of these studies is the preliminary empirical documentation of the effectiveness of interactive multimedia instruction in teaching oral communication skills. (Contains 12 references.) (RS)