- Interchange Third Edition is a 4-level series for adult and young adult learners of English from the beginning to the high-intermediate level. The Student"s Book A, Level 1, builds on the foundations established in the Intro level for accurate and fluent communication, extending grammatical, lexical, and functional skills. Student"s Book A contains units 1-8, the first half of the full Student"s Book, along with frequent Progress Checks that allow students to assess and monitor their own learning, and a self-study section. Included is a Student Audio CD that contains the Conversation, Pronunciation, and self-study section from the Student"s Book. As with the other levels of Interchange Third Edition, a complete set of ancillaries is available to make classes productive, varied, and fun.