Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A simple but very practical book

Be frank I just read this book one time few years ago and never used the methods mentioned. One of the reasons is that I packed the book somewhere...But I assure all buyers that you will find the tools are simple and can be used quickly. There are no difficult mathematic (or should be very few computations are needed) but almost work as 'common sense' approach. Since post-it or similar products can be acquired almost in all offices, so you can try it out by yourself, or with your colleague (friends and family) almost immediately. I believe its power is that you can use the tools to communicate with others. After all, to solve a problem needs good thinking and also consensus. Buy and use it.