The Vocabulaire Progressif du Francais book collection is a four-level educational series (up to level C1) designed by CLE International publisher for teaching French vocabulary. This collection is used as one of the main resources for teaching alongside term books such as Taxi, Cafe Creme, and Campus. In this collection, each lesson is designed on two pages; the first page is for teaching and the second page is for exercises. Additionally, the student book answer key is provided in a separate book. Furthermore, student books, answer keys, and audio files of the books are available for free download.