This is a fabulous book for those of us who are activley involved in OD.
Judge & Holbeche have written a classic 'how to' book with some great backgound materials along with good, practical stuff that helps break down OD into manageable chunks.
The book is written in 2 parts, Judge does the first part which is all about the history & background of OD plus gives her take on the key priciples, models, theories etc that define what OD is and what an OD practitioner needs to be able to do to effectievly work in the field. There is some great materials for OD practitioners here.
Holbeche then takes these principles, ideas etc and relates them to the world of HR, she makes some interesting links into the practicalities of HR in organisations and has also included some insights through case studies.