This unit aims at introducing students to the main schools of thought in the areas of Peace, Violence and Security, especially with regards to International Relations theory. It also aims at noticing central concepts within such approaches and the way in which theoretical developments have been unfolding in these area-studies. This curricular unity intends that students acquire fundamental knowledges related to theoretical and conceptual assumptions, authors, works of reference and debates; it also wishes them to develop argumentative capacity, critical analysis competence, whether in theoretical terms, or in terms of analysis of international realities, and the different readings that such differentiated perspectives offer to its analysis and understanding. Apart from the theoretical framing of the topics, the course privileges analyses of content and contextual debates centred on scientific texts and relevant case studies in different areas.