Book excerpt: The Interchange Third Edition Full Contact Edition includes key components of Interchange Level 3 all under one cover: the Student's Book; the Video Activity Book; the Workbook; and the Self-Study Audio CD. Each Student's Book contains 16 teaching units, frequent progress checks that allow students to assess and monitor their own learning, and a self-study section. The Workbook has six-page units that follow the same sequence as the Student's Book, recycling and reviewing language from previous units. The full-color Video Activity Book is designed to accompany the video and provides pre- and post-viewing tasks for the learner. The Student's Self-Study Audio CD includes the Snapshots, Word Powers, conversations, pronunciation, and self-study sections from the Student's Book. Interchange Level 3 Full Contact Part 4 contains units 13-16 of Interchange Level 3.