Instruct: Classify Amazon reviews into positive or negative sentiment
Query: An important contribution

While today the book's content seems pretty basic, at its publication the idea of thoroughly understanding the concept of the customer wasn't exactly widespread. Presenting without prior analyzing the goals and theories of the client, or misunderstanding them, is a prescription for objections. Don't make assumptions, is what we learn from this book, and we should be thankful for being reminded by the authors about this fundamental sales rule.