Like previous editions of the NCAA Division I Tournament , the tournament featured 64 participants out of a possible field of 198 teams . Of the 64 berths , 22 were allocated to the conference tournament or regular season winners . The remaining 42 berths were determined through an at-large process based upon teams ' Ratings Percentage Index that did not win their conference tournament . The most at-large berths went to schools from the Big East and Atlantic Coast conferences , containing half of the tournament field 's at-large berths ( six and five berths , respectively ) . Of the remaining 11 berths , six were from the Colonial Athletic and Conference USA conferences , each earning three berths
Big East
Big East Conference (1979–2013)
2011 NCAA Division I Men's Soccer Tournament