This textbook was used in my introductory Chinese (Mandarin) class in college, in conjunction with the three-volume Pinyin set of texts (Lessons, Notes and Exercises, Character Workbook), also put out by Pricenton University Press. It contains the texts of the lessons found in the above-mentioned Blue Book (Lessons), in simplified and traditional Chinese characters. This four-book system provides an excellent introduction to a complex language, and will reward the diligent student.