This master's thesis based on the concept of English as a lingua franca proposed by David Crystal and its impact on teaching and learning English deals with the need of renewing didactic planning in educational centers, proposing improve-ments to help students develop fluency and proficiency in this globalized world where English serves as their primary, as we said before, lingua franca. The the-sis also aims to implement active methodologies, specifically Project Based Learning (PBL) and student-teacher role changing, into a practical curriculum. Finally, this study emphasizes the importance of coherent and well-structured di-dactic planning to improve educational outcomes.