The purpose of this research was to investigate relations between students' academic motivation, cognition, and achievement. In particular, substantial issues are investigated involving the interaction of students' academic motivation and cognition, and specifies how selected motivational and cognitive variables may influence student academic achievement. In order to do this, this study develops a causal model of student achievement which, using goal theory as a framework, incorporates both motivational and cognitive variables to account for students' academic achivement. In total, the results suggest that students' academic achievement may be both conceptualised, and operationalised, as the product of interrelations between key facilitating, motivational, and cognitive variables. Despite some limitations, the study suggests several positive directions for future research. These include, in particular, further investigation of the social goals identified, how these goals relate to students' academic cognition, and how selected social goals and strategies together influence students' academic achievement. There is also further scope to investigate the role of particular facilitating variables in 'driving' students' academic motivation and cognition. Thus, the present research provides an empirical basis from which future, complementary, research may be undertaken / Doctor of Philosophy (PhD)