This book is designed to familiarise students with leading International Relations theories and their explanation of political events, phenomena, and processes which cross the territorial boundaries of the state. Thus, students will be exposed to the interplay between power, interest, ideas, identity, and resistance, in explaining continuity and change in international relations. Developed to provide students with the analytical tools and intellectual frameworks needed to understand the behaviour of different international actors in contemporary global affairs. This textbook responds to the challenges of a dynamic job market by assisting students to gain both thorough theoretical knowledge and training them to apply this knowledge to real world problems.