This presentation describes and analyzes the nature of cooperation and internationalization, the institutional and non-institutional faces of the internationalization of higher education at the National University of San Luis (Argentina) in the period 2005-2014. The objective is to examine the role of institutional actors and norms, such as the University Statute, the Organizational Plan, the action of the Office of Interinstitutional Relations, the National Law on Higher Education and the suggestions of documents emanating from international organizations, on the one hand and non-institutional facets, such as the motivation of students and professors in internationalization processes. With this task, institutional norms and documents were examined and, through semi-structured interviews, the views of internationalization of students and professors.