There are plenty of books that purport to tell the reader how to coach, how to be a good coach or how to use a particular style of coaching. The Reflecting Glass is different from most of them, in that it looks at coaching as a subject and a process. It concentrates on development coaching and succeeds in making all aspects of the topic very clear and easy to understand, whilst highlighting critical issues.
As a coach, I find this book extremely useful. I believe its unbiased study of the subject from all angles, including that of the sponsor, the client and the coach, make it compulsory reading for all H.R. executives with responsibility for senior management development (and useful reading for most senior executives).