"[Warren] has created something unique and valuable for all of us who are seeking to understand how to make organizations better, to manage the constancy of change and to create agility and adaptability.... At last we are able to put some science together with the art of organizational change. The goal is to help generate a higher level of success - something that would be worth billions of dollars if we are to believe the statistics - and to bring a much sharper focus to the practice of organization change management."

Peter Cheese, Chief Executive of the Chartered Institute of Personnel and Development (CIPD)

"Parry boldly proposes that the art of change can become a data-driven science.... [Parry] spent 15 years collating data about change initiatives. After thousands of in-depth interviews he applied machine learning and statistical methods to find that successful (and unsuccessful) change initiatives follow predictable paths.... It's a useful book... for managers who are seriously committed to change."

Professional Manager magazine