Four Corners is an integrated four-skills English course for adults and young adults. The interleaved Four Corners Teacher's Edition with Assessment Audio CD/CD-ROM, Level 4 features complete teaching instructions, optional activities, photocopiable video activity sheets, video teaching notes, audio and video scripts, language summaries, and Student Book and Workbook answer keys. The Assessment CD-ROM provides a complete assessment program, including oral and written quizzes, as well as unit tests in printable PDF and Microsoft Word® formats.