Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Never managed to read the book up to now

I bought this book because I wanted to get technical details about how billing is done and instead of that I got, from the very first chapter to the last, some sort of repetititive management and regulatory check-lists.The book seems to have been written for contemplative bosses completely disconnected from operations and who need to build powerpoint slides to tell what his team is up to.For technical folks who are in the telecoms industry, the book by its academic and disconnected approach is surely a boring read. For a software shop like ours, needing to build billing support tools, this book is up to now completely useless.