A theoretical perspective associated with A.F.K. Organski (1958) which seeks to explain trends between warring states. He observed that a nation is likely to emerge as a hegemon, and that it will eventually face a challenge from a great power. He also argued that an even distribution of capabilities between competing groups is likely to enhance the probability of war. According to Organski, peace is maintained when there is an imbalance of capabilities between advantaged and disadvantaged nations. The aggressor will derive from a small group of states dissatisfied with the present system. It is also likely to be a relatively weaker state.