This excerpt taken from the ATVI 10-Q filed Nov 10, 2008.
Change in Segment Presentation In conjunction with the Business Combination, we changed the manner in which senior management assesses the operating performance of, and allocates resources to, its operating segments. As a result, we operate four business segments: (i) Blizzard Entertainment, Inc. and its subsidiaries publishing of traditional games and online subscription-based games in the massively multiplayer online game (MMOG) category (Blizzard), (ii) Activision Publishing - publishing interactive entertainment software and peripherals which includes certain studios, assets, and titles previously included in Vivendi Games Sierra Entertainment prior to the Business Combination (Activision), (iii) Activision Blizzard Distribution - distribution of interactive entertainment software and hardware products (Distribution) (these three business segments form Activision Blizzards core operations) and (iv) Activision Blizzards non-core exit operations. Activision Blizzards non-core exit operations represent legacy Vivendi Games divisions or business units that the Company has begun to exit or wind down as part of our restructuring and integration efforts as a result of the Business Combination, but do not meet the criteria for separate reporting of discontinued operations. In accordance with the provisions of Statement of Financial Standards, No. 131, Disclosures about Segments of an Enterprise and Related Information, (SFAS No. 131), all prior period segment information has been restated, when practical, to conform to this new financial statement presentation (see Note 14 for details).