Amazon.com description: Product Description: 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, Presentation Plus, Intro can be used on an interactive whiteboard, portable interactive software technology, or with a computer and a projector. With Presentation Plus, teachers can present the Student's Book, Workbook, or Video Activity Worksheets, play the Class Audio and the Video Program, and display scripts and answer keys. Presentation Plus tools allow teachers to mark up and add links to the components in addition to saving their sessions. In addition, Presentation Plus features the full Interchange Arcade. Teachers can also connect to Cambridge Dictionaries Online for additional reference and language support.