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 3 builds on the foundations established in Level 2 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.