EXHIBIT 99.1



FOR IMMEDIATE RELEASE

                                                                        CONTACT:
                                                                     Kristin Van
                                                     Information Resources, Inc.
                                                                    312.474.3384
                                                         kristin.van@infores.com


              TRIAL DATE SET FOR ANTITRUST ACTION AGAINST ACNIELSEN

                    David Boies to Try Landmark Suit for IRI


CHICAGO, May 21, 2003 - A U.S. District Court judge today set a trial date of
September 20, 2004 in Information Resources, Inc.'s (Nasdaq: IRIC) antitrust
lawsuit against A.C. Nielsen Co. (now owned by VNU, N.V.), The Dun & Bradstreet
Corp., and IMS International, Inc., in which IRI is seeking damages in excess of
$1 billion after trebling. The jury trial in this case is scheduled to last
between ten and sixteen weeks. "This is a landmark lawsuit, both in terms of the
scope of the illegal activities and the potential size of the judgment. It
involves well-orchestrated worldwide anticompetitive practices by ACNielsen
designed to monopolize the markets for retail tracking services by crippling
IRI," said David Boies, of Boies, Schiller & Flexner, L.L.P., who will try the
case for IRI.

In separate proceedings, the Canadian Competition Tribunal and the European
Commission already have found that these same practices by ACNielsen were
abusive and either prevented IRI from entering markets or artificially raised
the costs of doing so. "We are very encouraged that a trial date has been set.
We now have a specific date on which we will be able to tell our story and
present our evidence to a jury in United States federal court," said IRI
Chairman and CEO Joe Durrett.

Certain matters discussed above are forward-looking statements that are subject
to risks and uncertainties that could cause actual results to differ materially
from those anticipated. These risks and uncertainties are described in reports
and other documents filed by the Company with the Securities and Exchange
Commission including the Company's Annual Report on Form 10-K for the year 2002.

Information Resources, Inc. is a leading provider of UPC scanner- and
panel-based business solutions to the consumer packaged goods (CPG) and
healthcare industries, offering services in the U.S., Europe and other
international markets. The Company supplies CPG and pharmaceutical
manufacturers, retailers, and brokers with information and analysis critical to
their sales, marketing, and supply chain operations. IRI provides services
designed to deliver value through an enhanced understanding of the consumer to a
majority of the Fortune 500 companies in the CPG industry.