The World Class book series is an advanced two-level (Upper Intermediate – Advanced) educational series from Heinle publishers in collaboration with the National Geographic documentary network for language learning at an advanced level. In this collection, content, images, videos, and resources from the National Geographic network are used for teaching so that language learners can engage in learning with scientific and interesting topics. This collection is based on practical and specific educational goals and connects language learners with their surrounding world through real topics and subjects. Additionally, all lessons are developed using real people, real places, and real language, which may be a little daunting for beginners! This collection is commonly used for teaching and education in continuation of the World English course from the same publisher. This series has two levels, 1 and 2, each level consisting of a student book with 12 lessons, a practice book, video files, and exercise software.