At the end of this Curricular Unit the students will have acquired the knowledge, skills and competences that allow them: to understand the sustainability challenges associated with the complex system of cities; both in their various spatial-territorial scales, as well as in the various thematic components of sustainability. The intervening actors and their role to produce cities are also analyzed. Special focus on environmental sustainability, but without neglecting other components of the urban sustainable system; to know, analyze and critically discuss case-studies of cities (or urban zones) leaders in the best practices in the transition to urban sustainability; to develop analyzes and audits of urban sustainability applying knowledge in real cases in the Lisbon Metropolitan Area; to understand the different spheres of application of paradigms and intervention strategies, which differ from European contexts to other contexts in other regions of the globe.