I am an instructional designer of online learning and in an effort to implement discussions in the courses I create, I ordered four books on discussion-based online learning. This book was by far the most comprehensive, balanced, and useful book of the four. While reading the book, I was immediately able to implement the strategies outlined in the book, and justify my reasons for implementing groups/discussions to the college instructors teaching the courses I create. I think that this book is valuable to anyone creating and supporting online learning: instructors, professors, instructional designers, trainers, and training managers. I even copied several pages of the book that justify online learning as a whole for my director.