Students' motivation has been identified as a critical factor for meaningful engagement and positive academic achievement in various educational settings. In particular, self-regulation strategies have been identified as important skills in online learning environments. However, applying self-regulation strategies, such as goal setting, strategic planning, and reflect performance takes significant effort. Without motivation, students will not enact these types of strategies. Autonomous self-regulation has been investigated in traditional classroom settings and there is ample empirical evidence of a significant relationship between autonomous self-regulation and engagement and academic achievement. However, such research was limited in online learning environments. The purpose of this study was to investigate the factors that affected students' autonomous or self-determined forms of regulation as defined in self-determination theory (SDT). The study examined the relations between students' self-regulated motivation and four other variables (students' interests in the course, students' perception of their instructor's interaction type, students' technology self-efficacy, and students' perception of the degree to which their online learning environment used constructivistbased pedagogy), and the interactions among these variables in college online courses. In addition, the study examined the relationship between students' autonomous forms of regulation and their engagement, learning achievement, interaction behaviors, and satisfaction in the online course. For students' interaction behaviors, the total number of TABLE OF CONTENT Page LIST OF TABLES…………………………………………………………………… iv