Since the dawn of the discipline of International Relations, concepts of power and security have always held a central role and have drawn different and sometimes conflicting interpretations. These varied interpretations gave rise to diverse theoretical approaches and schools of thought with their own ideas as to how actors can become powerful and how security can be provided. These academic debates are also accompanied by different understandings and implementations of nation-states and the roles of the military with regard to these issue areas of power and security. Over time, various transformations in the nature of the international system and the nature of conflicts also obliged the discipline to revisit its previous conceptualizations of power and security. As the world became more interdependent, as international economy and economic security became more important issues, and as the number of interstate conflicts decreased while at the same time non-traditional security problems emerged, definitions and previous ontological categorizations also had to be transformed.