Book excerpt: Through contributions from leading organisation development practitioners with unparalleled experience, A Field Guide for Organisation Development answers four questions: What is OD and why does it matter? Where does OD fit and who does it? How do you actually do OD? How do you know if it's worked and prove the benefit? This book provides a bridge between the theory and history of OD and the actual work of those practicing it in the field. It is as comprehensive a resource to support the practice of Organisation Development as can be found anywhere.