NFL schedule formula numbers will continue for the 2008 NFL schedule and the 2009 NFL schedule. The NFL formula that is currently in place began in the 2001 season. NFL formula incorporates interconference and intraconference matchups. Since 2001 the NFL formula has each team playing every other team in the league at least twice, home and away. The NFL formula guarantees that every NFL city will see every other team in the league on a rotating basis. The NFL formula has teams playing teams in their own division, home and away in addition to playing another division. What this means in terms of the NFL formula is that some former division rivals still play each other.