[Note 1] The category was reinstated for 1967 through 1969, before lapsing again in 1970; after returning in 1973, it has remained to date.
[4] Hugo Award nominees and winners are chosen by supporting or attending members of the annual World Science Fiction Convention, or Worldcon, and the award presentation constitutes its central event.
The selection process is defined in the World Science Fiction Society Constitution as instant-runoff voting with six nominees, except in the case of a tie.
The novelettes on the ballot are the six most-nominated by members that year, with no limit on the number of stories that can be nominated.
[3] Initial nominations are made by members in January through March, while voting on the ballot of six nominations is performed roughly in April through July, subject to change depending on when that year's Worldcon is held.