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 interleaved Teacher's Edition features complete teaching instructions, learning objectives, optional activities, teaching tips, listening scripts, language summaries, and Student Book and Workbook answer keys. Also included are written and oral quizzes, games, photocopiable activities, and fresh ideas for presenting and expanding upon the main exercise types in the Student's Book.