ADHD, commonly hyperactivity, is a fashionable diagnosis. We are so used to hearing it, that we forget to decipher: Attention Deficit Hyperactivity Disorder. This syndrome may have different manifestations in different children. For example, Vadik is a hyperactive child without attention deficit disorder. He’s very interested in what he is doing: he is totally absorbed, even too much. He grabs at everything at once, he thinks he needs to do things very quickly. He builds and then breaks to make it better. He's always asking questions, grabs at other children’s blocks. He interferes with what other children are doing and bothers them. If someone's house is falling, Vadik rushes to help ... And Grisha has attention deficit hyperactivity. He's acting strange from the beginning. It seems that he did not understand the task: he asks the other children what they are doing. He fails to start performing the task, distracted by the birds in the window, his fantasies, other children and items.