Instruct: Classify Amazon reviews into positive or negative sentiment
Query: The Introduction is Worth the Price of the Book

Level Six Performance is a great book and the tools that Dr. Long offers can be applied to any performance situation that I'm in, whether it be sales, or continuing education and training, or leading a team that's developing a strategy for a new product launch.However, the real value of the book is found in the introduction. Don't overlook this part of the book--the introduction alone is worth the price of the book! Long frames the entire book with his explaination of Level Six Performance.The introduction makes it understood that this book is a performance manual based on sound information and research, not simply a textbook. More authors should do what Dr. Long has done--make the research applicable!