Interchange Third edition is a four-level series for adult and young-adult learners of English from the beginning to the high-intermediate level. The Interchange Third Edition Level 3 Student's Book builds on the foundations established in Level 2 for accurate and fluent communication, extending grammatical, lexical, and functional skills. Topics are presented in unique ways using interesting real-life information. The Student's Book contains 16 teaching units, frequent progress checks that allow students to assess and monitor their own learning, and a listening self-study section. Included is a Student Audio CD that contains the conversation, pronunciation, and self-study sections from the Student's Book. Student's Book B contains units 9-16, the second half of the complete Level 3 Student's Book.