Book excerpt: Interchange Fourth Edition is a fully revised edition of Interchange, the world's most successful series for adult and young-adult learners of North American English. The course has been revised to reflect the most recent approaches to language teaching and learning. It remains the innovative series teachers and students have grown to love, while incorporating suggestions from teachers and students all over the world. This edition offers updated content in every unit, grammar practice, and opportunities to develop speaking and listening skills. Interchange Fourth Edition features contemporary topics and a strong focus on both accuracy and fluency. Its successful multi-skills syllabus integrates themes, grammar, functions, vocabulary, and pronunciation. The underlying philosophy of the course remains that language is best learned when it's used for meaningful communication.