Student's book World is a modern, dynamic five-level course for teenagers. It is designed to take students from A1 + to B2 of the Common European Framework of Reference for Languages (CEFR). World promotes critical thinking skills through meaningful communication. It expands students´ knowledge by providing extensive opportunities for teenage learners to express their ideas and explore the world. Our state-of-the-art learning platform, UDP Access, enhances students´ learning experience. It provides a blended approach which integrates antonomous online learning with classroom teaching to help students develop 21st century skills.