This is a helpful concept I was introduced to for improving how to delegate tasks and responsibilities. These are levels of authority you give to others when delegating.
Richard has some great thoughts about passion, note-taking, listening, leadership, hiring, and delegating. I especially recommend reading if you are looking for advice on these topics.
Spiritual Leadership one of the best books I have read. It is powerful, deep, and dense with substance. It contains a multitude of applications for leadership and management. My favorite chapters are 12: The Leader and Time and 13: The Leader and Reading. Chapter 13 contains practical applications on what to read, how to read, and how to get more out of what you read.