This is one of the Spoken Language Series, which began during the Second World War when the U.S. government hired the best linguists of the day to produce courses that would teach languages to soldiers fast. It is the same method used to teach languages to U.S. diplomats today. The book presents colloquial, everyday language and teaches forms that appear only in conversation. It is not as useful for learning reading. It is an effective and very enjoyable way to learn languages. However, the student should also consider Wheeler Thackston's "Introduction to Persian," which is more recent, and has, in my opinion, caused "Spoken Persian" to drop to second place. Thackston has nine sound cassettes available--if not from the book dealer, then from the publisher (that is where I got them); it teaches spoken and written Persian, lacks the defects of previous textbooks, and is more thorough, effective and enjoyable than any of its rivals.