A pleasure to read, the third edition of this renowned and respected landmark text by two gifted giants in the field offers a bright and meaningful roadmap to effectiveness. Clear, accurate, contemporary and updated with the latest advances, the book impeccably distils the tried and tested essential wisdom of seventy-five years of Organization Development in its purest form. A breath of fresh air full of actionable advice for the practitioner, a rigorous and definitive reference guide for the researcher and the academic and a delight for the curious mind, this book should be mandatory reading for anyone who cares deeply about the success of their people and their organization.