Three types of discourse - political, ideological, scholarly and empirical that can be applied to a consideration of politics. Why it is important to distinguish among these types of discourse. Using historical cases, compare the realist and the liberal approaches to the study of International Relations. The constructivist critique of the realist and liberal approaches to the study of International Relations. The levels of analysis, apply the levels approaches to the analysis of World War One and the Invasion of Iraq(2003). Why analyzing "power" is difficult? Balance of Power Politics/Theory and Collective Security.