The document discusses three studies related to using multimedia in education. The first study examined the effects of computer-aided concept cartoons on learning outcomes. It found that concept cartoons helped elicit student misconceptions and remedy them. The second study looked at the impact of using multimedia on student achievement at King Saud University. It determined that multimedia was an effective means of achieving better learning. The third study analyzed the effect of instructor-personalized multimedia in online classes. It concluded that multimedia supplements like video and audio engaged students.