In this report we have analysed the complex process of sustainability integration in university education. Based on a review of the academic literature, we identify the key aspects that should be considered at each level in order to achieve a successful sustainability integration into student learning. With the aim of examining these elements of analysis in a real case, the experience of Pompeu Fabra University is presented. The steps taken by this institution are differentiated at the institutional, curricular and pedagogical levels. In order to improve teaching in sustainability, a proposal is formulated that combines different and complementary approaches, paying attention to the process of integrating sustainability contents into the curriculum.