The WNIT began in 1994 as a 16-team preseason tournament; the preseason version has remained at that field size throughout its history. Originally, the preseason WNIT was a single-elimination tournament, but since the 2007 edition has used a format which guarantees all participating teams three games. Since it is classified by the NCAA as an "exempt" event, a team can only participate in the preseason WNIT once every four years; additionally, only one team per conference may participate. The postseason WNIT started in 1998 as a 16-team tournament. It was doubled to a 32-team tournament in 1999. In 2006, competing schools assumed more responsibility, hosting the early rounds of the tourney, and additional expansion was made to forty teams. At that time, schools which won their regular-season conference title but were excluded from the NCAA tournament by having lost their conference tournament were awarded automatic bids. The field was further expanded in 2007 to 48 teams, with automatic bids awarded to each Division I conference. The tournament was expanded to its current 64 teams in 2010. The postseason field consists of 32 automatic berths – one from each conference – and 32 at-large teams. Thirty-two spots in the Postseason WNIT are filled automatically by the best team available in each of the nation's 32 conferences, If a conference's automatic qualifier team declines the WNIT invitation, the conference forfeits that automatic spot, and that selection goes into the pool of at-large schools. The remaining 32 team slots in the Postseason WNIT are filled by the top teams available. Any team from a Division I conference, or a Division I independent team, will be considered. Any team considered for an at-large berth must have an overall record of.500 or better. Bids are announced on the evening of the same day that the NCAA tourney bids are made. The current, 64-team tournament has 32 first-round games, followed by 16 second-round games, eight third-round games, four quarterfinal games, two semifinal games, and the championship. Since the WNIT is a for-profit tournament, all games are played on the site of the higher bidding team. The nationalchampionship game is currently carried on CBS Sports Network.
Championship history
Postseason
*Was called National Women's Invitational Tournament.
Preseason
*Was called National Women's Invitational Tournament.