Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Conversation Starter for Small Groups

I have read MacDonald's books in the past, and found them very thought provoking. This particular book is especially useful in Small Groups. The group I am currently leading reads the book together at the meeting, and discusses it as we go along. There are discussion questions in the back of the book, but we seldom get to them. One caveat; this book has undergone a few updates. Although the different versions can be used together, it is much easier (and less distracting) if all are using the same version. If buying it "used" this might be something to watch for.