Stanford's and the Chicago Bears' unexpected success with the modern T formation prompted coaches around the nation to adopt it. Shaughnessy and Halas taught coaching clinics, and Bears quarterback Sid Luckman installed the formation at his alma mater, . Luckman also helped implement the T on national championship teams at both Army and Notre Dame. By 1944, more than half of the country's football teams at the collegiate and professional level were using the T. In 1949, the Pittsburgh Steelers were the only NFL team still using the single-wing. The T formation led to numerous derivatives, many of which remain in use today, including the power I, pro set, veer, wishbone, split T, wing T, and West Coast offense.