EXHIBIT 99.9

FOR IMMEDIATE RELEASE

CONTACTS

VNU USA: Georgina Challis, 212-536-5199
Nielsen Media Research
For Media: Jack Loftus, 212-708-7724
For Investors & Analysts: Eileen O'Connor, 212-708-7745

            VNU N.V. AND NIELSEN MEDIA RESEARCH RECEIVE REQUEST FOR
               ADDITIONAL INFORMATION UNDER HART-SCOTT-RODINO ACT

    NEW YORK, SEPTEMBER 7, 1999--VNU N.V. and Nielsen Media Research, Inc.
(NYSE: NMR) announced today that they have received a request for additional
information from the Federal Trade Commission (FTC) in the United States. The
request was made under the Hart-Scott-Rodino Antitrust Improvements Act of 1976
in connection with the cash tender offer under which Nielsen Media Research is
to become a subsidiary of VNU USA. The definitive merger agreement under which
VNU will acquire all of the common stock of Nielsen Media Research was announced
on August 16, 1999. Under the Hart-Scott-Rodino Act, the tendered shares cannot
be purchased earlier than 10 days after the companies substantially comply with
the request from the FTC.

    VNU and Nielsen Media Research stated that they intend to respond promptly
to the request for additional information and remain confident that the offer
will be completed in the autumn of 1999. The offer continues to be subject to
the satisfaction of certain other conditions, including the valid tender of a
majority of Nielsen Media Research fully diluted shares outstanding.

    The offer and withdrawal rights are currently scheduled to expire at
midnight, New York City time, on Friday, September 17, 1999. Questions and
requests for assistance with respect to the offer may be directed to MacKenzie
Partners, Inc., the Information Agent for the offer, at (212) 929-5500 (call
collect) or (800) 322-2885, or to Merrill Lynch & Co., the Dealer Manager for
the offer, at (212) 236-3790 (call collect).

    VNU N.V. is a Netherlands-based international publishing company, whose
operations include consumer and professional magazines, newspapers, telephone
directories and information services, educational textbooks, marketing
information services, trade shows and entertainment. Worldwide, VNU employs
approximately 15,000 people and has annual revenues of more than NLG 5.3 billion
(EUR 2.4 billion).

    Nielsen Media Research is the leading provider of television audience
measurement and related services in the United States and Canada. Its services
provide audience estimates for all national program sources, including broadcast
networks, cable networks, Spanish language television, and national syndicators.
Local ratings services estimate audiences for each of the 210 television markets
in the U.S., including electronic metered service in 46 markets. Nielsen Media
Research provides competitive advertising intelligence information through
Nielsen Monitor-Plus, and Internet usage and advertising information through
Nielsen//NetRatings. Additional information is available at
HTTP://WWW.NIELSENMEDIA.COM.