The margins of manoeuvre of the foreign policies of small states and international cooperation are extremely important theoretical concepts for the international analysis of a state, hence the importance of a study by researchers and academics around the world. This work has been designed in three chapters and merges different historical moments of the concepts analysed, particularly the theoretical term "international cooperation", which is dealt with in two different moments in order to modernise it in the light of new theoretical trends that explain more clearly how we should understand international cooperation today.