This course is an introduction to the language and assumes no prior knowledge of Bulgarian or other Slavic languages. Each unit is divided into three parts: Basic Sentences, Notes, and Drills, with review units also included. Using both the book and audio, the student is gradually moved toward proficiency in spoken Bulgarian and its grammar. Level Two continues the first level for students who want greater proficiency. Level One and Two contain over 25 hours of audio plus 2 useful texts, The Flash drive is a handy 8 MB drive which now includes Bulgarian E-books as well as the Foreign Service course.