This document outlines the steps in planning a CLIL (Content and Language Integrated Learning) unit on world population for a 2nd year ESO (secondary education) social science class. It includes defining the driving question, previewing unit content and vocabulary, identifying the easiest and hardest sections, connecting to curriculum standards, and considering how to incorporate interdisciplinary topics and soft skills. The goal is for students to understand issues around whether Earth's population limit will be reached and to work on competencies related to geography including analyzing population data and models of territorial organization.