This book is written so you don’t have to read/listen to the entire thing, just listen to what is relevant to you as a leader at the moment. It is an older method from the mid twenty-first century.
The problem is this. I took the assessment and listened to my sections. I found that they could not place me neatly on the continuum of the DISC circle. The first part of the description was correct, while the last part was completely off. I recommend “Now Discover Your Strengths” instead which allows for a greater spectrum of human tendencies.