"...rigorously apply artificial and unreliable diagnostic categories..."
You should only get Ritalin for indicated disorders by prescription from a physician. Ok? Because the doctor will rigorously apply artificial and unreliable diagnostic categories backed up by invalid and arbitrary screens and queries to make a diagnosis. So after this completely subjective and near useless evaluation is completed, your doctor should be able to exercise prudent clinical judgment to decide if Ritalin could be of benefit. In other words, he will ultimately decide based on little else but his own prejudices and/or consult the Magic 8 Ball. That'll be $250, please. Cash appreciated. (link)