In part one of this textbook, we dealt with the basics of studying international relations. Our aim was to give you the tools with which to then begin studying the world around us. We first looked at some analytical tools that can be used when studying international relations. The three levels of analysis can help us to understand the causes and effects of events and situations. Understanding how one event caused another event, or how one situation is connected with another situation is an important process of building knowledge. As in other fields of social sciences, we then looked at the problems related to perception. Understanding these problems will help us to overcome them.