<P> The National Baseball Hall of Fame and Museum in Cooperstown, New York honors individuals who have excelled in playing, managing, and serving the sport, and is the central point for the study of the history of baseball in the United States and beyond, displaying baseball - related artifacts and exhibits . Elections of worthy individuals to be honored by induction into the hall of fame commenced in 1936, although the first induction ceremonies were not held until the hall opened in 1939 . Through the elections for 2017, a total of 319 people have been inducted, including 220 former major league players, 32 executives, 35 Negro League players and executives, 22 managers, and 10 umpires . Each is listed showing his primary position; that is, the position or role in which the player made his greatest contribution to baseball according to the Hall of Fame . </P> <P> According to the current rules, players must have at least 10 years of major league experience to be eligible for induction . In addition, they must be retired for at least five years if living, or deceased for at least six months . Players meeting these qualifications must pass through a screening committee, and are then voted on by the Baseball Writers' Association of America (BBWAA). Each writer may vote for up to 10 players; to be admitted into the Hall of Fame, a player must be approved by 75% of those casting ballots . Players receiving less than 5% approval are removed from future BBWAA ballots . The rules, as revised in July 2016, allow that all individuals eligible for induction but not for the BBWAA ballot--players who have not been approved by the BBWAA election process within 15 years of their retirement, umpires, managers, pioneers, and executives--may be considered by one of four voting bodies that have taken over the role of the former Veterans Committee, based on the era in which each individual candidate made his greatest contribution to the sport . On a few occasions, exceptions have been made to the guidelines in place at the time: Lou Gehrig was elected in 1939 following his diagnosis of amyotrophic lateral sclerosis; Roberto Clemente was elected shortly after his death in 1972; and Addie Joss was elected in 1978 even though he completed only nine seasons before his death . </P>

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