a division of ACNielsen, a marketing research firm. In 1996, Nielsen Media Research was split off into an independent company, and in 1999 was purchased by the Dutch conglomerate VNU. In 2001, VNU also purchased ACNielsen, thereby bringing both companies under the same corporate umbrella. See also Television in Australia Television Ratings OzTAM Nielsen Media Research Australia References External links Tribal Mind Television news in Australia Market research Television terminology