Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A book with good topic but written in broken English

If you have never been in credit card business, and you have to start career there, the orientation of this book fits well. Of course, if you are already in the industry for at least 2 years, there is little in the book that can interest you much.But, at least the copy I bought, is loaded with grammar errors. Many sentences are not properly ended without a period. I felt somehow difficult to believe that this text can be used for group training.