When we interviewed Ken Iverson, he told us that nearly 100 percent of the success of Nucor was due to its ability to translate its simple concept into disciplined action consistent with that concept. It grew into a $3.5 billion Fortune 500 company with only four layers of management and a corporate headquarters staff of fewer than twenty-five people—executive, financial, secretarial, the whole shebang—crammed into a rented office the size of a small dental practice.