This introduction presents an overview of the key concepts discussed in the subsequent chapters of this book. The book has been prepared as an easy to use guide for student nurse, patients and clients. It contains information student nurse will need to help patients and clients day-to-day clinical practice. For example, the book includes tips and guidance on how to assess patients' lifestyle behaviours and, more importantly, how to provide guidance on changing their behaviour. In order to do this it also includes questions, short guides and figures that student nurse can share with their colleagues, patients and clients. The book is supposed to be kept close at hand in student nurse pocket, handbag and briefcase or wherever student nurse feel it will be of most use but not left to rot on student nurse bookshelf. It proves a useful addition to student nurse armoury and prove beneficial to student nurse and patients.