The Haas School of Business of the University of California at Berkeley announced Tuesday that it is rejoining the Consortium, a group of businesses and business schools working to promote diversity in business school education. Berkeley was a member of the group for a decade, but quit in 2003 after the state adopted a ban on the use of racial preferences in admissions by public universities. At that time, the Consortium awarded scholarships only to black, Latino and Native American students. But in 2005, it broadened criteria to allow awards to all who are committed to advancing the mission of diversity in business schools. The Berkeley business school announced that, based on that change, it now believes that membership in the group does not violate the state's ban.