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 CD-ROM, Level 1, provides engaging and enjoyable activities for users to do on a computer at home or at school. It contains 16 units and can used alongside the Student's Book to review and practice the language learned in class. At the core of each unit is a video sequence taken from the Intro Video. There are four progress tests and, in total, the CD-ROM gives learners more than 100 activities. It can be used on both PCs and Macs.