||This thesis uses computer modeling techniques to explore the implications of realist thought. It begins by reviewing structural realism and its derivatives, defensive realism and offensive realism, before discussing the role of computer modeling in the social sciences. Then, a model developed to investigate different schools of realism is described. Finally, the results from the model are reported and analyzed. The model tests whether states that aggressively seek to expand are more likely to survive, whether the offense-defense balance affects the stability of a system, and whether polarity affects the stability of the system. The results are unable to confirm the predications of either defensive realism or offensive realism, but demonstrate the importance of the offense-defense balance and polarity on systemic stability.