The need for high quality experimental research on the effectiveness of multimedia learning in K-12 schools is immense when considering the need to provide the best education for each child. However, there is little evidence-based research available to guide education leaders' decisions relating to technology initiatives. Therefore, the purpose of this study was to determine the effectiveness of a multimedia tutorial system on the computer self-efficacy and mathematics students' learning outcomes. This research assessed the role of learning styles in students' learning outcomes. The researcher implemented a quasi-experimental mixed methodology design that included quantitative and qualitative approach to increase validity. The research study involved a sample of sixty eighth grade students from two different public middle schools comprised of fifty percent male and fifty percent females. The multimedia group consisted of twenty-nine students and the traditional group consisted of thirty-one students. The study included data collected from a pre-test and post-test unit assessment, computer self-efficacy survey, learning style inventory, and student and teacher interview questionnaires. The research findings indicated learning outcomes achieved by students in the multimedia learning environment were statistically significant greater than the traditional face-to-face learning environment. The study revealed computer self-efficacy was more significant in the learning outcomes of the multimedia learning group, and learning style plays a significant role within the experimental group. Students and teachers made many positive comments about the benefits of the multimedia learning environment. This study was important to teachers and administrators who are investigating ways to incorporate technology into the classroom. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com.bibliotheek.ehb.be/en-US/products/dissertations/individuals.shtml.]