Hugo Award nominees and winners are chosen by supporting or attending members of the annual
World Science Fiction Convention (Worldcon) and the presentation evening constitutes its central event. The selection process was defined during the category's tenure in the World Science Fiction Society Constitution as
instant-runoff voting with five finalists, except in the case of a tie. These five works on the ballot are the five most-nominated by members that year, with no limit on the number of works that can be nominated. The 1953 through 1956 and 1958 awards did not include any recognition of runner-up magazines, but since 1959 all five candidates were recorded. Initial nominations are made by members in January through March, while voting on the ballot of five finalists is performed roughly in April through July, subject to change depending on when that year's Worldcon is held. Worldcons are generally held near the start of September, and are held in a different city around the world each year. == Winners and finalists ==