In the past, children were diagnosed with attention deficit disorder (ADD) because they didn't pay attention, had poor organizational skills, and did poorly on tasks requiring sustained mental activity, such as schoolwork. Children were diagnosed with hyperactivity if they were constantly on the go and behaved impulsively. Now the two diagnoses have been combined into attentiondeficit/hyperactivity disorder (ADHD), and the definitions have been expanded. Today almost any child can be diagnosed with ADHD. That includes youngsters with a low energy level and a tendency to daydream.