I first read this book for a doctoral practicum seminar and found it helpful for understanding my strengths and growth edges as a counselor-in-training. I read it again when I began providing clinical supervision for masters and doctoral students in counseling psychology, and appreciated how it helped me again realize both my own developmental level as well as how to work with my supervisees' training needs. Since then, I have used this in supervision sessions with students (particularly some of the summary tables) and appreciate how it helps alleviate a lot of the anxiety trainees feel as it normalizes their uneven skill development. The only down side to this book is that it is out of print and can be difficult to get one's hands on a copy!