The third edition of International Relations Theories. Discipline and Diversity comes with a new chapter on Critical Theory and slightly updated chapters overall. Noteworthy, new examples have been selected to accurately reflect the current developments in world affairs and to prove that discussion about theory remains relevant (for example, the transition from Bush to Obama is discussed in the chapter dedicated to Marxism, the Arab Spring in the chapter on Critical Theory, the intervention in Libya in 2011 is used to make considerations about a Normative International Relations approach etc