The giant slalom was added to the world championships in 1950 at Aspen, Colorado, and debuted at the Winter Olympics in 1952 at Oslo, Norway, run at Norefjell. The GS has been run in every world championships and Olympics since. Originally a one-run event, a second run was added for men at the world championships in 1966, run on consecutive days, and at the Olympics in 1968. The second run for women was added at the world championships in 1978, and made its Olympic debut in 1980.