This book is about behaviout; in our view as authors behaviour is about communication between people in a context or environment. A major factor in our communication and relationship with others is how we contract with them, and whether we do this implicitly or explicitly. So this book is going to start with a contract (contracting will be dealt with in more detail in Chapter 3). However, we hope that by making this contract explicit it will be clear that the value of this book will be dependent on each party keeping their side of the contract. The reader will only get as much out of the book as they are prepared to apply, tryout and understand its ideas. This can only happen if the authors and the publishers have done their part in making the book accessible and relevant.