Such practices may be seen as particularly harmful in schools and universities that have a stated purpose of promoting ethnic diversity and inclusion. In recognition of the responsibility of higher education to eliminate behaviors that create a hostile environment for education, in 2005 the NCAA initiated a policy against "hostile and abusive" names and mascots that led to the change of many derived from Native American culture, with the exception of those that established an agreement with particular tribes for the use of their specific names. Other schools retain their names because they were founded for the education of Native Americans, and continue to have a significant number of indigenous students. The trend towards the elimination of indigenous names and mascots in local schools has been steady, with two thirds having been eliminated over the past 50 years according to the National Congress of American Indians (NCAI).