As with most other U.S. intercollegiate sports, competitive college baseball is played under the auspices of either the NCAA, the NAIA, the NJCAA, or the CCCAA. The NCAA writes the rules of play, while each sanctioning body supervises season-ending tournaments. The final rounds of the NCAA Division I tournament is known as the College World Series (CWS); while each of the three levels of competition sanctioned by the NCAA holds a championship tournament, the "College World Series" branding is reserved strictly for the final round of the Division I tournament. The CWS takes place in Omaha, Nebraska in June, following the regular season. The playoff bracket for Division I consists of 64 teams, with four teams playing at each of 16 regional sites (in a double-elimination format). The 16 winners advance to the Super Regionals at eight sites, played head-to-head in a best-of-three series. The eight winners then advance to the CWS, a double-elimination tournament (actually two separate four-team brackets) to determine the two national finalists. The finalists play a best-of-three series to determine the Division I national champion. The most recent College World Series winner is Vanderbilt; the next NCAA tournament will not be until 2021 at the earliest.