Interchange Fourth Edition is a four-level series for adult and young-adult learners of English from the beginning to the high-intermediate level. Student's Book, Level 1 builds on the foundations established in the Intro level for accurate and fluent communication, extending grammatical, lexical, and functional skills. The Student's Book contains 16 teaching units, progress checks, additional Interchange activities, and a Grammar Plus section that provides additional grammar explanations and practice. Included is a Self-study DVD-ROM that provides the full class video and extra practice with vocabulary, grammar, speaking, listening, and reading. The DVD-ROM contains supplementary exercises. The corresponding Audio CDs are only sold separately.