This book is a Guide for Users. The book is built to be used. Every pair of pages, front and back, go together. This book can be taken apart. Pull out any page and you will have a complete concept or set of concepts. Use it! This Guide is built on the experience and learning of the many, many people around the world who use Do No Harm in their daily work. It also reflects the experiences and dilemmas of many would-be users who have, for a variety of reasons, found it difficult to apply Do No Harm as they want to. Over several years, the Do No Harm Project has visited people around the world who are working with the Do No Harm approaches and tools—or trying to do so. We have listened to them, learned from them, and worked with them. This Guide emerged from this ongoing collaboration. Through these many users and would-be users, the Do No Harm Project has gathered what appears here. This Guide is Do No Harm focused. It is truly a Users’ Guide, in that it both reflects how people find Do No Harm most useful, and it translates it into new approaches, tools, and techniques that others can pick up, learn, and use.