What can I say, initially the book is excellent, it explains everything so well, the lessons are very long, it explains grammar amazingly and overall the structure of the book is fantastic. Finally, this self-study method can compete, even surpass other self-study methods (at least for German). I highly recommend it for anyone who wants to learn German on their own (and I would also suggest having the German Grammar and Syntax by Praxis Editions with you for each lesson)!!!!!!