This book is about how to think carefully about treatments, so you can make better choices. This book will teach you how to think carefully about treatments by asking three types of questions. First, you will learn about the questions you should ask when someone says something about a treatment. Second, you will learn about the questions that health researchers ask to find out more about the effects of treatments. Third, you will learn about the questions that you should ask when you are choosing whether to use a treatment. Adults, especially parents and doctors, make most choices for children. This book will prepare you for making more choices of treatments as you grow older.