Information technology is complicated. And so, for those who do not understand how it works, it may be dangerous. The same is true for cars and rotary saws. Risk management is not just for certified professionals to practice; we all manage risk. The little sister who guides her younger brother across a busy street, the advisor to a president regarding a matter of national security—these people manage risk. They—we all—have to consider probabilities for success and failure, for living and dying.