However you define success -- a happy family, good friends, a satisfying career, robust health, financial security, the freedom to pursue your passions -- it tends to be accompanied by a couple of qualities. When psychologists isolate the personal qualities that predict "positive outcomes" in life, they consistently find two traits: intelligence and self-control. So far researchers still haven't learned how to permanently increase intelligence. But they have discovered, or at least rediscovered, how to improve self-control.