LONDON, February 17, 2004 OneSource Information Services, a leading provider of business information solutions, was commended in a recent Butler Group Technology Audit for delivering an impressive product, Global Business Browser, that ties together highly accurate business information with a means of easily searching and filtering both structured and unstructured data. The report also praises the product for depth and data quality, ease of deployment and reliability.

In summarizing his findings, Principal Analyst Michael Thompson comments, "We are constantly told that we live in the Information Age, and in Butler Group''s opinion, with Global Business Browser, that statement just took on a greater level of believability."

Butler Group is the premier European provider of Information Technology research, analysis and advice. Butler Technology Audits provide an objective third-party assessment on the relevance and effectiveness of specific IT products and services.

Global Business Browser was introduced because business professionals require global perspectives to complement detailed coverage of local markets. Through Global Business Browser, business professionals can access in-depth intelligence on companies whose operations reach beyond any one region or continent.

In the favorable review, Butler Group describes OneSource as far more than an integrator of information and distinguishes OneSource from various content providers.

"OneSource Global Business Browser delivers exceptional value with the weighting of the information, the ability to mix structured and unstructured content, and the implementation of one of the most intuitive interfaces we have ever come across."

"It''s inconceivable to think that any user would not be able to navigate through Global Business Browser and formulate any required set of search criteria with no training whatsoever," notes Thompson.

"We are very pleased with the results of Butler Group''s independent review," commented Andrew Hughes, OneSource UK Commercial Director. "Their conclusions parallel the experience of our more than 750 global customers who have already discovered the advantages of fast, easy access to the most trusted business information."

About OneSource Information Services

OneSource, a recognized leader in business information solutions, delivers unparalleled company, executive, and industry intelligence that make business professionals more effective and productive in completing their critical daily tasks. OneSource(R) products and services support a company''s vital business processes including serving their customers, finding and leveraging new opportunities, and managing suppliers and partners.

OneSource combines and organizes content from over 2,500 information sources supplied by more than 30 world-class content providers, creating an unequalled information resource encompassing corporate families, industries, executives, financials, news, analyst reports, and trade and business press articles. Using its Global Business Taxonomy(TM) system, OneSource links this in-depth information on over 1.7 million companies worldwide resulting in the most extensive company-linked repository of business information in the world.

Users of OneSource products work faster, smarter, and more productively, whether leveraging OneSource business information through the Web-based OneSource Business Browser product line or through enterprise applications or portals integrated seamlessly via the OneSource AppLink(SM) software development kit (SDK). To help customers link the OneSource Enhanced Information Warehouse(TM) repository into their preferred enterprise applications, OneSource provides consulting and integration services.

OneSource is headquartered in Concord, MA, with offices located in North America, Europe, and the Pacific Rim. Product information is available at www.onesource.com. Customers include Bank One, Chubb, Citigroup, Cisco, Deloitte & Touche, HP, i2 Technologies, Orange, Royal & SunAlliance, SAS Institute, and Sun Microsystems.

OneSource, Business Browser, Global Business Taxonomy, AppLink, Enhanced Information Warehouse and/or other OneSource product and service names referenced herein are either trademarks or service marks or registered trademarks or service marks of OneSource Information Services, Inc. or its subsidiaries in the United States and/or other countries. All other product and service names mentioned herein are trademarks or service marks of their respective owners.

Safe Harbor Statement

This news release contains certain forward-looking statements that are based on the current beliefs and expectations of OneSource''s management, as well as assumptions made by, and information currently available to, OneSource''s management. Such statements include, but are not limited to, those regarding the functionality and effectiveness of OneSource products and services and OneSource''s competitive position. Because such statements involve risks and uncertainties, actual actions and strategies and the timing and expected results thereof may differ materially from those expressed or implied by such forward-looking statements, and OneSource''s future results, performance, or achievements could differ materially from those expressed in, or implied by, any such forward-looking statements. Risks, uncertainties, assumptions, and factors that could affect OneSource''s financial results are described in OneSource''s recent filings with the United States Securities and Exchange Commission including its most recent quarterly report on Form 10-Q.