Bracketology is the process of predicting the field of college basketball participants in the NCAA Basketball Tournament, named as such because it is commonly used to fill in tournament brackets for the postseason. It incorporates some method of predicting what the NCAA Selection Committee will use as its Ratings Percentage Index in order to determine at-large (non-conference winning) teams to complete the field of 68 teams, and, to seed the field by ranking all teams from first through sixty-eighth. Bracketology also encompasses the process of predicting the winners of each of the brackets. In recent years the concept of bracketology has been applied to areas outside of basketball.
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