to be implemented on the number of flagrant fouls to eventually lead to an overall cleaner game. One-and-done rule The One-and-done rule has been a part of college basketball since 2006, the first NBA draft it affected. The rule was created by NBA Commissioner, David Stern, which changed the draft age from 18 years old to 19 years old. This change meant players could not be drafted into the NBA straight out of high school. Instead, however, they usually went to a college to play only one season before entering the following NBA draft when they are eligible, hence the name One-and-Done. The first player to be drafted during this "one-and-done era" was Tyrus Thomas, a forward out of Louisiana State, who was drafted fourth overall in 2006. Conferences NCAA Division I In 2021–2022, a total of 358 schools played men's basketball in 32 Division I basketball conferences. All of these schools also sponsor women's basketball except The Citadel and VMI, two military colleges that were all-male until the 1990s and remain overwhelmingly male today. The conferences for 2021–22 are America East Conference American Athletic Conference Atlantic 10 Conference Atlantic Coast Conference ASUN Conference Big 12 Conference Big East Conference Big Sky Conference Big South Conference Big Ten Conference Big West Conference Colonial Athletic Association Conference USA Horizon League Ivy League Metro Atlantic Athletic Conference Mid-American Conference Mid-Eastern Athletic Conference Missouri Valley Conference Mountain West Conference Northeast Conference Ohio Valley Conference Pac-12 Conference Patriot League Southeastern Conference Southern Conference Southland Conference Southwestern Athletic Conference Sun Belt Conference Summit League West Coast Conference Western Athletic Conference In the early decades of college basketball, and well into the 1970s, many schools played as independents, with no conference membership. However, the rise of televised college sports in the 1980s led to the formation of many new conferences and the expansion of previously existing conferences. The last Division I school to play as an independent in basketball was NJIT, which was forced to go independent in 2013 after the collapse of its former all-sports league, the Great West Conference. NJIT joined the Atlantic Sun Conference in 2015, leaving no Division I basketball independents. NCAA Division II As of the upcoming 2020–21 college basketball season, there are 23 Division II basketball conferences: California Collegiate Athletic Association Central Atlantic Collegiate Conference Central Intercollegiate Athletic Association Conference Carolinas East Coast Conference Great American Conference Great Lakes Intercollegiate