Interchange Fourth Edition is a four-level series for adult and young-adult learners of English from the beginning to the high-intermediate level. Interchange Fourth Edition Intro Student's Book B with Self-study DVD-ROM and Online Workbook B Pack provides additional activities to reinforce what is presented in the Student's Book. The Online Workbook includes activities which correspond to the Student's Book lessons; instant feedback for hundreds of activities; clear, easy-to-follow navigation to support self-study; and simple tools to monitor progress.