Keywords:
Political Leaders , Personal Interest , Power, Preferences , Perceptions, Decision MakingCopyright (c) 2010 Bruce BUENO DE MESQUITA

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Abstract
This Bruce Bueno de Mesquita’s fragment sets out the principles and general lines that support the Rational Choice Theory and its application to International Relations. Starting with the idea that we must pay attention, not to Nation States, but to Political Leaders ?motivated by personal interests, not national ones, such as their wish to stay in office?, and Decision Making Processes; Bueno de Mesquita challenges the assumptions of previous paradigms related to the separation among the National and International scene. He also states how the Political Leaders, influenced by three key concepts, such as power, preferences and perceptions, take decisions and coordinate their foreign policy actions, using strategic interactions.