Book excerpt: Attention Deficit Hyperactivity Disorder (ADHD) is now one of the most common childhood disorders right across the world, with a wealth of conflicting advice available everywhere you look. But most parents want only one thing: to find out what is going on with their child and how they can help them. The ADHD Handbook draws on the most up-to-date research from around the world to present a comprehensive look at ADHD, covering everything from how it is diagnosed to the common myths surrounding what causes it, from the brain anatomy implicated in the disorder to the pros and cons of the various types of medication, and from the most effective psychotherapies to the best parenting techniques.