Ivy League Group Agreement to all intercollegiate sports, effective with the 1955–56 basketball season. This is generally reckoned as the formal formation of the Ivy League. As part of the transition, Brown, the only Ivy that hadn't joined the EIBL, did so for the 1954–55 season. A year later, the Ivy League absorbed the EIBL. The Ivy League claims the EIBL's history as its own. Through the EIBL, it is the oldest basketball conference in Division I. As late as the 1960s many of the Ivy League universities' undergraduate programs remained open only to men, with Cornell the only one to have
Ivy League is women's heavyweight. The Ivy League was the last Division I basketball conference to institute a conference postseason tournament; the first tournaments for men and women were held at the end of the 2016–17 season. The tournaments only award the Ivy League automatic bids for the NCAA Division I Men's and Women's Basketball Tournaments; the official conference championships continue to be awarded based solely on regular-season results. Before the 2016–17 season, the automatic bids were based solely on regular-season record, with a one-game playoff (or series of one-game playoffs if more than two teams were tied) held to determine the