Resumen: The purpose of this dissertation is to propose a didactic unit that helps increase students' involvement and participation in the EFL classroom. To do this, I have designed a Task-Based unit thought to be implemented in the 4th year of CSE. This unit revolves around the city of Zaragoza, and establishes an international scenario that requires students to mediate with a group of international visitors. The first part of the work is devoted to explaining the theoretical and curricular framework, as well as the methodology behind the proposal. The second part presents an analysis of the unit and its alignment with the Aragonese curriculum. Lastly, I put forward some suggestions for improvement and conclusions.