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 Workbook has six-page units that follow the same sequence as the Student's Book, recycling and reviewing language from previous units. It provides additional practice in grammar, vocabulary, reading, and writing. The Workbook can be appropriate for in-class work or assigned as homework.
Passages, Second Edition, is a thoroughly revised edition of Passages, the successful two-level, multi-skills course that takes adult and young-adult learners of English from the high-intermediate to advanced level.