ONESOURCE INFORMATION SERVICES INC
S-1/A, 1999-04-22
COMPUTER PROCESSING & DATA PREPARATION
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<PAGE>   1
 
   
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON APRIL 22, 1999
    
 
   
                                                      REGISTRATION NO. 333-73263
    
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549
                            ------------------------
 
   
                               AMENDMENT NO. 1 TO
    
 
                                    FORM S-1
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------
 
                      ONESOURCE INFORMATION SERVICES, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
                            ------------------------
 
<TABLE>
<S>                                  <C>                                  <C>
              DELAWARE                               7375                              04-3204522
    (STATE OR OTHER JURISDICTION         (PRIMARY STANDARD INDUSTRIAL               (I.R.S. EMPLOYER
 OF INCORPORATION OR ORGANIZATION)       CLASSIFICATION CODE NUMBER)             IDENTIFICATION NUMBER)
</TABLE>
 
                            ------------------------
 
                            150 CAMBRIDGEPARK DRIVE
                              CAMBRIDGE, MA 02140
                                  617-441-7000
         (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING
            AREA CODE, OF REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
                            ------------------------
 
           DANIEL J. SCHIMMEL, PRESIDENT AND CHIEF EXECUTIVE OFFICER
                      ONESOURCE INFORMATION SERVICES, INC.
                            150 CAMBRIDGEPARK DRIVE
                              CAMBRIDGE, MA 02140
                                  617-441-7000
            (NAME, ADDRESS INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
                   INCLUDING AREA CODE, OF AGENT FOR SERVICE)
                            ------------------------
                                   COPIES TO:
 
<TABLE>
<S>                                                   <C>
               LAWRENCE S. WITTENBERG                                  KEVIN F. BLATCHFORD
           TESTA, HURWITZ & THIBEAULT, LLP                               SIDLEY & AUSTIN
                   125 HIGH STREET                                  ONE FIRST NATIONAL PLAZA
             BOSTON, MASSACHUSETTS 02110                             CHICAGO, ILLINOIS 60603
                 TEL: (617) 248-7000                                   TEL: (312) 853-7000
                 FAX: (617) 248-7100                                   FAX: (312) 853-7036
</TABLE>
 
     APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:  As soon
as practicable after the effective date hereof.
     If any of the securities being registered on this form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, check the following box.  [ ]
     If this form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, check the following box and
list the Securities Act registration statement number of the earlier effective
registration statement for the same offering.  [ ]
- ------------.
     If this form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.  [ ]
- ------------.
     If this form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.  [ ]
- ------------.
     If delivery of the prospectus is expected to be made pursuant to Rule 434,
check the following box.  [X]
                            ------------------------
 
                        CALCULATION OF REGISTRATION FEE
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
   
<TABLE>
<CAPTION>
                                                           PROPOSED MAXIMUM         PROPOSED MAXIMUM     AMOUNT OF
   TITLE OF EACH CLASS OF           AMOUNT TO BE            OFFERING PRICE         AGGREGATE OFFERING    REGISTRATION FEE(3)
 SECURITIES TO BE REGISTERED       REGISTERED(1)             PER SHARE(2)             PRICE(1)(2)        ------------------------
- ---------------------------------------------------------------------------------------------------------------------------------
<S>                           <C>                      <C>                      <C>                      <C>
Common stock, $0.01 par
  value......................        4,181,400                  $12.00                $50,176,800               $13,949.15
- ---------------------------------------------------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------------------------------------------
</TABLE>
    
 
   
(1) Includes 545,400 shares which the underwriters may purchase to cover
    over-allotments, if any.
    
   
(2) Estimated solely for the purpose of determining the registration fee.
    
   
(3) Includes $11,259.00 previously paid.
    
   
                            ------------------------
    
 
     THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THIS REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(a),
MAY DETERMINE.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   2
 
THE INFORMATION IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED. WE MAY
NOT SELL THESE SECURITIES UNTIL THE REGISTRATION STATEMENT FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS PROSPECTUS IS NOT AN OFFER
TO SELL THESE SECURITIES
AND IT IS NOT SOLICITING AN OFFER TO BUY THESE SECURITIES IN ANY STATE WHERE THE
OFFER OR SALE IS NOT PERMITTED.
 
   
                  SUBJECT TO COMPLETION, DATED APRIL 22, 1999
    
PROSPECTUS
   
                                3,636,000 SHARES
    
                                ONE SOURCE LOGO
 
                                  COMMON STOCK
 
   
     OneSource Information Services, Inc. is offering 2,500,000 shares of its
common stock and the selling stockholders are offering 1,136,000 shares of
OneSource's common stock owned by them. We will not receive any of the proceeds
from the selling stockholders' sale of their shares.
    
 
   
     This is our initial public offering and no public market currently exists
for our shares. We expect the initial public offering price to be between $10.00
and $12.00 per share. We will list the common stock on the Nasdaq National
Market under the symbol "ONES."
    
 
   
     INVESTING IN OUR COMMON STOCK INVOLVES RISKS. FOR MORE INFORMATION, SEE
"RISK FACTORS" COMMENCING ON PAGE 7.
    
                          ---------------------------
 
     NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES, OR DETERMINED THAT
THIS PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
 
<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------
- -----------------------------------------------------------------------------------------------
                                                            PER SHARE              TOTAL
- -----------------------------------------------------------------------------------------------
<S>                                                    <C>                  <C>
Public Offering Price................................  $                    $
Underwriting Discount................................  $                    $
Proceeds to OneSource Information Services, Inc......  $                    $
Proceeds to Selling Stockholders.....................  $                    $
- -----------------------------------------------------------------------------------------------
- -----------------------------------------------------------------------------------------------
</TABLE>
 
   
     The underwriters may also purchase up to an additional 545,400 shares at
the public offering price, less the underwriting discount, from the selling
stockholders within 30 days from the date of this prospectus to cover
over-allotments.
    
   
    
 
   
WILLIAM BLAIR & COMPANY
    
 
   
                           U.S. BANCORP PIPER JAFFRAY
    
 
                                                    ADAMS, HARKNESS & HILL, INC.
 
   
               The date of this prospectus is              , 1999
    
<PAGE>   3
 
     [The inside front cover depicts four computer screen shots of the OneSource
Business Browser. The heading on the page is "Ready-To-Use Business
Information." The top three computer screen shots depict the Global Business
Browser, the European Business Browser, and the UK Business Browser. The fourth
computer screen shot depicts Market Forecasts and contains a chart graphic.
There are four ellipses on the page that briefly describe the potential uses of
the business information contained in the Business Browser products, including:
"Profile a Company"; "Prospect for New Customers"; "Track Competitors"; and
"Research an Industry". The OneSource logo is in the lower right hand corner of
the page.]
   
    
 
   
                             [FOUR COLOR ART WORK]
    
<PAGE>   4
- --------------------------------------------------------------------------------
                               PROSPECTUS SUMMARY
 
     This summary highlights information contained elsewhere in this prospectus.
It is not complete and does not contain all of the information that you should
consider before investing in our common stock. You should read the entire
prospectus carefully.
 
   
                                  THE COMPANY
    
 
     OneSource provides Web-based business and financial information to
professionals who need quick access to reliable corporate, industry and market
intelligence. Our Business Browser product line integrates comprehensive and
up-to-date business and financial information on over one million public and
private companies from more than 25 information providers drawing upon over
2,500 sources of content. These sources include both textual information, such
as news, trade press, SEC filings, executive biographies and analyst reports,
and numeric information, such as company financial results, stock quotes and
industry statistics. Our customers access this information over the Internet
using standard Web browsers at a fixed annual subscription price.
 
   
     According to Simba Information Inc., the market for all Web-based and
on-line business information services was nearly $24.8 billion in 1997 and is
projected to grow to almost $39.8 billion in 2002. This reflects a compound
annual growth rate of 9.9%. Simba also reported that the primary market segment
in which OneSource participates--Web-based and on-line financial news, current
awareness and research services--was $5.4 billion in 1997 and is projected to
grow to $9.8 billion in 2002. This reflects a compound annual growth rate of
12.6%. Recent industry growth has been driven by corporations and other
enterprises recognizing that productivity and competitiveness depend on
extensive knowledge of external information, including information about
industries, customers, competitors, prospects, business trends, breaking news
and market data.
    
 
     OneSource focuses on the functional uses of the business and financial
information it delivers. The Business Browser product line has been designed for
use not only by traditional users of business information, but also throughout
an organization, including sales, marketing, finance and management
professionals. We apply our knowledge of how business professionals use
information to transform raw, disparate data into meaningful, actionable
information. We focus on integrating and presenting information so that
interpretation, manipulation and analysis can be performed more easily by the
end user. Because our products are based on standard Web technology, our
customers require minimal installation and systems support, and users, after
minimal training, have full access to the products at any time from anywhere via
the Internet.
 
     Our products are designed to address information needs of leading
professional and financial services firms, technology companies and other large
organizations. Representative customers include American Express, Bain &
Company, BankAmerica, Boeing, British Telecom, Deloitte & Touche, Ernst & Young,
Harvard Business School, KPMG Peat Marwick, MCI/WorldCom, Merrill Lynch, Oracle
and SAP.
 
     OneSource's fixed annual pricing strategy is designed to be particularly
attractive to large organizations. The annual subscription price for the
Business Browser product line declines on a per-user basis as the total number
of users increases. The fixed-price model encourages professionals to use the
products as needed without concern with additional, usage-based charges, and a
declining marginal price per user encourages customers to distribute the
products widely throughout their organizations.
- --------------------------------------------------------------------------------
                                        3
<PAGE>   5
- --------------------------------------------------------------------------------
   
     At March 31, 1999, 460 organizations subscribed to our Web-based Business
Browser product line, up from 279 at March 31, 1998. On average, our customers
for Web-based products at March 31, 1999 had an annualized contract value of
$61,604 per customer, compared to $42,489 per customer at March 31, 1998. The
annualized value of Business Browser customer contracts was $25.9 million at
December 31, 1998, having grown from $9.0 million at the end of 1997. Of this
$25.9 million, $14.2 million was attributable to those customers that were under
contract at both December 31, 1997 and 1998. The renewal rate of the Business
Browser product line for 1998 was 90% calculated on a dollar basis. For more
information regarding annualized contract value, see "Management's Discussion
and Analysis of Financial Condition and Results of Operations."
    
 
     Our goal is to become a leading Web-based provider of business and
financial information to professionals worldwide. Our strategy to accomplish
this objective includes:
 
        - focusing on the information needs of professionals in large
          organizations
 
        - expanding our customer base through our sales and marketing efforts
 
        - leveraging our existing customer base by expanding the number of users
          per customer and upgrading those customers to new or enhanced products
 
        - continually expanding the content and functionality of our products
          and designing additional products
 
        - selectively seeking possible strategic acquisitions and alliances
 
                                  THE OFFERING
 
   
<TABLE>
<S>                                        <C>
Shares offered by OneSource..............  2,500,000
Shares offered by the selling
  stockholders...........................  1,136,000
Shares outstanding immediately after the
  offering...............................  9,926,500
Shares reserved for issuance with respect
  to outstanding options and warrants....  4,393,005
Use of proceeds..........................  Repayment of outstanding debt, payments
                                           to terminate management fee arrangements
                                           and general corporate purposes, including
                                           working capital and possibly to acquire
                                           or invest in complementary businesses,
                                           products or technologies
Proposed Nasdaq National Market symbol...  ONES
</TABLE>
    
                                      
- --------------------------------------------------------------------------------

                                       4
<PAGE>   6
- --------------------------------------------------------------------------------
                      SUMMARY CONSOLIDATED FINANCIAL DATA
      (IN THOUSANDS, EXCEPT PER SHARE, SHARE AND NUMBER OF CUSTOMERS DATA)
 
   
     The summary financial data set forth below should be read in conjunction
with the Consolidated Financial Statements and Notes thereto and "Management's
Discussion and Analysis of Financial Condition and Results of Operations." The
Pro Forma As Adjusted column included in Balance Sheet Data adjusts the numbers
in the Actual column to give effect to:
    
 
   
     - the reclassification of the Class P common stock as described in
       "Reclassification"
    
 
   
     - the sale of 2,500,000 shares of common stock by OneSource in this
       offering at the assumed initial public offering price of $11.00 per share
       after deducting the estimated underwriting discount and offering expenses
       as if the sale had been completed on March 31, 1999
    
 
   
     - the use of the estimated net proceeds to OneSource as described in "Use
       of Proceeds"
    
 
   
     - the issuance of 15,696 shares pursuant to the partial exercise of a
       warrant by a selling stockholder as described in "Capitalization"
    
 
   
<TABLE>
<CAPTION>
                                                                       THREE MONTHS ENDED
                                        YEAR ENDED DECEMBER 31,             MARCH 31,
                                    -------------------------------   ---------------------
                                     1996      1997        1998        1998        1999
                                    -------   -------   -----------   -------   -----------
<S>                                 <C>       <C>       <C>           <C>       <C>
STATEMENT OF OPERATIONS DATA:
Web-based product revenues........  $    15   $ 3,312   $    16,058   $ 2,628   $     6,903
CD Rom product revenues(1)........   30,419    27,072        14,370     5,322         1,240
                                    -------   -------   -----------   -------   -----------
  Total revenues..................   30,434    30,384        30,428     7,950         8,143
                                    =======   =======   ===========   =======   ===========
Gross profit......................   17,895    17,539        16,773     4,684         4,686
Operating expenses................   19,488    18,943        21,737     5,315         5,505
                                    -------   -------   -----------   -------   -----------
Loss from operations..............   (1,593)   (1,404)       (4,964)     (631)         (819)
Interest income (expense), net....     (733)     (930)         (595)     (244)          (93)
Gain on sale of product line......       --       501        12,797        --            --
Other income......................      393        --            --        --           500
                                    -------   -------   -----------   -------   -----------
Income (loss) before income
  taxes...........................   (1,933)   (1,833)        7,238      (875)         (412)
                                    =======   =======   ===========   =======   ===========
Net income (loss).................  $(1,933)  $(1,833)  $     6,988   $  (875)  $      (412)
                                    =======   =======   ===========   =======   ===========
Unaudited pro forma earnings per
  share:(2)
  Basic...........................                      $      0.91             $     (0.05)
  Diluted.........................                      $      0.66             $     (0.05)
  Weighted average common shares
     outstanding:
     Basic........................                        7,644,012               7,706,409
     Diluted......................                       10,566,326               7,706,409
</TABLE>
    
- --------------------------------------------------------------------------------

                                        5
<PAGE>   7
- --------------------------------------------------------------------------------
   
<TABLE>
<CAPTION>
                                                                     MARCH 31, 1999
                                                              ----------------------------
                                                                               PRO FORMA
                                                                 ACTUAL       AS ADJUSTED
                                                              ------------    ------------
<S>                                                           <C>             <C>
BALANCE SHEET DATA:
Cash and cash equivalents...................................    $  6,739        $20,914
Working capital (deficit)...................................      (3,001)        10,956
Total assets................................................      20,723         34,549
Total debt (including capital lease obligations)............       6,850            580
Deferred revenues...........................................      15,293         15,293
Total stockholders' equity (deficit)........................      (6,655)        13,572
</TABLE>
    
 
   
<TABLE>
<CAPTION>
                                                  DECEMBER 31,               MARCH 31,
                                           ---------------------------   -----------------
                                            1996      1997      1998      1998      1999
                                           -------   -------   -------   -------   -------
<S>                                        <C>       <C>       <C>       <C>       <C>
OTHER DATA FOR WEB-BASED PRODUCTS:
Annualized contract value................  $   412   $ 8,973   $25,920   $11,854   $28,338
Number of customers......................       11       233       445       279       460
Average annualized contract value per
  customer...............................  $  37.4   $  38.5   $  58.2   $  42.5   $  61.6
</TABLE>
    
 
- ------------
   
(1) In 1997 and 1998, OneSource divested two CD Rom product lines. Revenues
    attributable to these divested product lines, which are included in the
    statement of operations data through the divestiture date, were $6,415,000,
    $6,630,000, $2,612,000 and $1,554,000 in the years ended December 31, 1996,
    1997 and 1998 and for the three months ended March 31, 1998, respectively.
    
 
   
(2) Unaudited pro forma basic and diluted earnings per share of common stock for
    the year ended December 31, 1998 and for the three months ended March 31,
    1999 have been calculated based on net income attributable to all classes of
    common stock and assuming the reclassification had occurred at January 1,
    1998 and January 1, 1999, respectively.
    
 
                          -------------------------------
 
   
     OneSource was incorporated in Delaware on July 21, 1993 under the name
Datext Holding Corporation. Our principal executive offices are located at 150
CambridgePark Drive, Cambridge, MA 02140, and our telephone number is (617)
441-7000.
    
                          ---------------------------
 
   
     OneSource(TM), Business Browser(TM), OneSource Business Browser(TM),
Business Browser AppLink(TM), AppLink(TM), and the OneSource logo are our
trademarks. Other trademarks and tradenames in this prospectus are the property
of their respective owners.
    
                          ---------------------------
 
   
     Unless the context otherwise requires, any reference to "OneSource" in this
prospectus means OneSource Information Services, Inc. and its subsidiary. Unless
otherwise indicated, all information contained in this prospectus:
    
 
   
        - reflects the merger on February 26, 1999 of OneSource Information
          Services, Inc. into its parent, OneSource Holding Corporation, and the
          name change of OneSource Holding Corporation to OneSource Information
          Services, Inc.
    
 
   
        - reflects a 2.035 for one stock split to be effected before the
          completion of this offering
    
 
   
        - reflects the reclassification of the Class P common stock which will
          occur immediately prior to the completion of this offering
    
 
   
        - assumes no exercise of the underwriters' over-allotment option
    
   
    
- --------------------------------------------------------------------------------

                                        6
<PAGE>   8
 
                                  RISK FACTORS
 
     You should consider carefully the risks described below before you decide
to buy our common stock. The risks and uncertainties described below are not the
only ones we face. Additional risks and uncertainties that we do not presently
know about or that we currently believe are immaterial may also adversely impact
our business operations.
 
   
     If any of the following risks actually occur, our business, financial
condition or results of operations would likely suffer. In this case, the
trading price of our common stock could fall, and you may lose all or part of
the money you paid to buy our common stock.
    
 
   
     This prospectus also contains forward-looking statements that involve
substantial risks and uncertainties. Our actual results, performance or
achievements could differ significantly from those expressed in or implied by
these forward-looking statements as a result of several factors, including the
risks we face, as more fully described below in this section and elsewhere in
this prospectus.
    
 
   
WE HAVE A LIMITED OPERATING
HISTORY WITH BUSINESS
BROWSER ON WHICH TO
EVALUATE OUR PROSPECTS
                               We began operations as an independent company in
                               1993. We began to migrate our business to the Web
                               from CD Rom-based products in early 1996, and
                               launched the Web-based Business Browser product
                               line in December 1996. Our prospects must be
                               considered in light of the risks, expenses and
                               difficulties frequently encountered by companies
                               transitioning to a new product line, particularly
                               companies in the new and rapidly evolving market
                               for Internet and Web-based business information
                               products.
    
 
   
OUR BUSINESS BROWSER
PRODUCTS HAVE NOT BEEN
PROFITABLE AND MAY NOT
BECOME PROFITABLE IN THE
FUTURE

    
   
                               We incurred losses from operations of
                               approximately $1.6 million in 1996, $1.4 million
                               in 1997, $5.0 million in 1998 and $0.8 million in
                               the three months ended March 31, 1999. In
                               addition, we have not reached the critical mass
                               of users of Web-based products which we believe
                               is necessary to leverage effectively our royalty
                               payments and infrastructure expenses and become
                               profitable. As of March 31, 1999, we had an
                               accumulated deficit of $10.9 million.
    
 
   
WE RELY ON OUR BUSINESS
BROWSER PRODUCT LINE, AND
WE WILL NOT SUCCEED UNLESS
DEMAND FOR OUR BUSINESS
BROWSER PRODUCTS CONTINUES
TO GROW                        Subscription revenues from our Business Browser
                               product line accounted for 53% of total revenues
                               in 1998 and 11% in 1997. These subscription
                               revenues accounted for 83% of our total
                               annualized contract value at the end of 1998 and
                               29% at the end of 1997. We are currently phasing
                               out CD Rom products that are not part of the
                               Business Browser product line. As a result, our
                               future financial condition will depend heavily on
                               the success or failure of our Business Browser
                               product line. Business Browser products were
                               introduced in December 1996 and it is difficult
                               to predict demand and market acceptance for these
                               products in the new and rapidly evolving
                               Web-based business information services market.
                               If the demand for Business Browser products does
                               not grow, whether due to competition, lack of
                               market acceptance, failure of Internet or
    
 
                                        7
<PAGE>   9
 
                               Web use to grow in general, technological change
                               or other factors, our business would suffer
                               significantly.
 
   
ANNUALIZED CONTRACT VALUE
MAY NOT BE AN ACCURATE
INDICATION OF OUR
PERFORMANCE                    We use "annualized contract value" as a
                               measurement for normalized period-to-period
                               comparisons to indicate business volume and
                               growth. Our presentation and calculation of
                               annualized contract value may not be comparable
                               to similarly titled measures used by other
                               companies. It is not an absolute indicator and we
                               cannot guarantee that any annualized contract
                               value will be ultimately realized as revenues.
    
 
   
COMPETITION IN OUR INDUSTRY
IS INTENSE AND MANY OF OUR
COMPETITORS HAVE GREATER
RESOURCES THAN WE DO; THIS
COMPETITION MAY ADVERSELY
AFFECT OUR FINANCIAL
RESULTS                        The business information services industry is
                               intensely competitive. We face direct or indirect
                               competition from the following types of
                               companies:
    
 
                               - large, well-established business and financial
                                 information providers such as Dow Jones,
                                 Dialog, Lexis-Nexis, Pearson, Reuters, Thomson,
                                 Primark and McGraw-Hill
 
                               - on-line information services or Websites
                                 targeted to specific markets or applications,
                                 such as NewsEdge, Factset and Bloomberg
 
                               - providers of sales, marketing and credit
                                 information such as Dun & Bradstreet
 
                               - Web retrieval, Web "portal" companies and other
                                 free or low-cost mass market on-line services
                                 such as Excite, Infoseek, Lycos, Yahoo! and
                                 AOL/Netscape
 
   
                               - free or low-cost specialized business and
                                 financial information Websites such as
                                 Hoovers.com, Marketwatch.com, Multex.com and
                                 TheStreet.com
    
 
   
                               Based on reported operating results, industry
                               reports and other publicly available information,
                               we believe that many of our existing competitors,
                               as well as a number of prospective competitors,
                               have longer operating histories, greater name
                               recognition, larger customer bases and
                               significantly greater financial, technical and
                               marketing resources than we do. As a result, they
                               may be able to respond more quickly to new or
                               emerging technologies and changes in user
                               requirements, or to devote greater resources to
                               the development, promotion and sale of their
                               products than we can. These competitors may be
                               able to undertake more extensive marketing
                               campaigns, adopt more aggressive pricing policies
                               and make more attractive offers to potential
                               employees, customers and information providers.
                               Our competitors also may develop products that
                               are equal or superior to our products or that
                               achieve greater market acceptance than our
                               products.
    
 
                                        8
<PAGE>   10
 
   
FREE INFORMATION MAY LESSEN
THE DEMAND FOR BUSINESS
BROWSER                        Some of our competitors offer financial and
                               business information free of charge with the goal
                               of achieving high enough usage to facilitate the
                               sale of substantial amounts of advertising. To
                               the extent these types of competitors offer
                               products free of charge that are similar to ours,
                               it would have a material adverse impact on our
                               business, financial condition and results of
                               operations. In addition, extensive free
                               information is available in the public domain.
                               Sources of this information include government
                               agencies, libraries and sources on the Internet.
    
 
   
INCREASED COMPETITION COULD
RESULT IN PRICE REDUCTIONS,
REDUCED GROSS MARGINS AND
LOSS OF MARKET SHARE           There are relatively low barriers to entry to the
                               Web-based information market and we may face
                               additional competition from new entrants. We also
                               expect that competition may increase as a result
                               of industry consolidation. It is possible that
                               new competitors may emerge and rapidly acquire
                               significant market share. Increased competition
                               is likely to result in price reductions, reduced
                               gross margins and loss of market share. Any of
                               these would have a material adverse effect on our
                               business, financial condition and results of
                               operations.
    
 
   
IF OUR INFORMATION
PROVIDERS STOPPED DOING 
BUSINESS WITH US, WE COULD
NOT CONTINUE TO
SELL BUSINESS BROWSER          We do not own or create the original content
                               distributed through our products. We depend
                               entirely on information providers to supply
                               information and data feeds to us on a timely
                               basis. Our products could experience
                               interruptions due to any failure or delay in the
                               transmission or receipt of this information.
    
 
   
                               Many of our information providers compete with
                               one another and, in some cases, with us, for
                               users. We do not have exclusive distribution
                               arrangements with any of our information
                               providers. Accordingly, all of our information
                               providers can distribute their content themselves
                               directly or through our competitors. Business
                               decisions made by our information providers could
                               adversely affect the availability or pricing of
                               their information to us.
    
 
                               Our arrangements with our information providers
                               generally extend for one-year periods, which
                               automatically renew unless terminated by notice
                               given at least three months prior to the end of
                               the term. In the event of a breach by us, the
                               contracts can be terminated on relatively short
                               notice. An information provider may be difficult
                               to replace and the loss of one or more
                               significant information providers could decrease
                               the quality, quantity or mix of the information
                               distributed through our products. This could make
                               our products less competitive. If information
                               providers terminate their relationships with us,
                               our business and delivery of our products may be
                               disrupted.
 
                                        9
<PAGE>   11
 
                               This could result in a loss of customers or
                               requests for refunds.
 
   
OUR PRIMARY COSTS ARE
ROYALTY PAYMENTS TO
INFORMATION PROVIDERS          Any increase in the royalty rates we negotiate
                               with our information providers could have an
                               adverse effect on our gross profits, financial
                               condition and results of operations.
    
 
   
IF OUR WEBSITE SERVICE IS
DISRUPTED, OUR CUSTOMERS
COULD LOSE ACCESS TO
BUSINESS BROWSER AND OUR
REPUTATION COULD BE HARMED     Our on-line site is located at a dedicated
                               hosting facility and we do not currently have a
                               shadow site fully equivalent to the live on-line
                               site. Any damage to the hosting facility or the
                               equipment there, such as damage by fire or power
                               loss, or loss of telecommunications could disrupt
                               the delivery of our products. In addition, our
                               users depend on Internet service providers,
                               on-line service providers and other Website
                               operators for access to our products. Each of
                               them has experienced significant outages in the
                               past, and could experience outages, delays and
                               other difficulties due to system failures
                               unrelated to our on-line architecture. These
                               types of occurrences could cause users to
                               perceive our products as not functioning properly
                               and therefore cause them to use other methods to
                               obtain their business and financial information.
    
 
                               The number of Business Browser users has
                               increased since its introduction in December 1996
                               and we are seeking to further increase our user
                               base. This has led to increased usage and
                               increased demands on our on-line architecture.
                               Any downtime or slow response times may damage
                               our reputation and make it more difficult to
                               attract new users.
 
   
OUR MARKET IS NEW AND
RAPIDLY EVOLVING; AS A
RESULT, WE MAY NOT BE ABLE TO
ACCURATELY PREDICT AND RESPOND
TO MARKET DEVELOPMENTS
    
                               The market for Web-based distribution of
                               electronic business and financial information has
                               only recently begun to develop and it is rapidly
                               evolving. This makes it difficult to predict
                               demand and market acceptance for our products. We
                               cannot guarantee that the market for our products
                               will grow or that our products will become widely
                               accepted. If the market for our products does not
                               develop as quickly as we expect or if our
                               products are not accepted by customers, our
                               future financial results will be adversely
                               affected. A significant increase in the number of
                               customers and development of new product
                               offerings could also require the expenditure of
                               significant amounts of money, time and other
                               resources. This could strain our personnel and
                               financial resources.
 
OUR PERFORMANCE WILL DEPEND
ON THE CONTINUED GROWTH AND
COMMERCIAL ACCEPTANCE OF
THE INTERNET                   Our business would be adversely affected if the
                               number of professionals using the Web does not
                               continue to grow. This growth may be inhibited by
                               a number of factors, such as:
 
                               - inadequate network infrastructure
 
                               - inconsistent quality of service
 
                                       10
<PAGE>   12
 
                               - lack of cost-effective, high-speed service
 
                               - security concerns
 
                               Even if Web use grows, the Internet
                               infrastructure may not be able to support
                               adequately future growth and its reliability and
                               quality of service may suffer. In addition,
                               numerous Websites have experienced service
                               interruptions due to outages and other delays
                               occurring internally and throughout the Internet
                               network infrastructure. If these outages or
                               delays occur frequently in the future, Web usage,
                               as well as usage of our products, could grow more
                               slowly or decline.
 
GOVERNMENT REGULATION AND
LEGAL UNCERTAINTIES
RELATING TO THE WEB COULD
HURT OUR BUSINESS              Currently, there are few laws or regulations that
                               specifically regulate communications or commerce
                               on the Web. However, laws and regulations may be
                               adopted that address issues such as user privacy,
                               pricing and the characteristics and quality of
                               products and services. For example, the
                               Telecommunications Act sought to prohibit the
                               transmission of certain types of information and
                               content over the Web. In addition, several
                               telecommunications companies have petitioned the
                               Federal Communications Commission to regulate
                               Internet and on-line service providers in a
                               manner similar to long distance telephone
                               carriers and to impose access fees on such
                               providers. This could increase the cost of
                               transmitting data over the Internet. Moreover, it
                               may take years to determine the extent to which
                               existing laws relating to issues such as property
                               ownership, libel and personal privacy apply to
                               the Web. Finally, state tax laws and regulations
                               relating to the provision of products and
                               services over the Internet are still developing.
                               If individual states impose taxes on products and
                               services provided over the Web, the cost of our
                               products may increase and we may not be able to
                               increase the price we charge for our products to
                               cover these costs. Any new laws or regulations or
                               new interpretations of existing laws and
                               regulations relating to the Web could adversely
                               affect our business.
 
   
OUR SUCCESS DEPENDS ON OUR
ABILITY TO PROTECT OUR
PROPRIETARY TECHNOLOGY         We believe that our success depends, in large
                               part, on protecting our intellectual property in
                               the United States and in foreign countries. Other
                               than our trademarks, most of our intellectual
                               property consists of proprietary or confidential
                               information that is not subject to patent or
                               similar protection. Competitors may independently
                               develop similar or superior products, software or
                               business models.
    
 
                               We cannot guarantee that we will be able to
                               protect our intellectual property. There is no
                               way to assure that unauthorized third parties
                               will not try to copy our products or business
                               model or use our confidential information to
                               develop
 
                                       11
<PAGE>   13
 
   
                               competing products. Legal standards relating to
                               the validity, enforceability and scope of
                               protection of proprietary rights in
                               Internet-related businesses are uncertain and
                               still evolving. As a result, we cannot predict
                               the future viability or value of our proprietary
                               rights and those of other companies within the
                               industry. We also cannot guarantee that our
                               business activities and products will not
                               infringe upon the proprietary rights of others,
                               or that other parties will not assert
                               infringement claims against us. Any infringement
                               claims and any resulting litigation, should it
                               occur, could subject us to significant liability
                               for damages and could result in invalidation of
                               our proprietary rights. Even if we eventually won
                               any resulting litigation, it could be
                               time-consuming and expensive to defend, and could
                               result in the diversion of our management's time
                               and attention.
    
 
WE COULD BE SUBJECT TO
LEGAL LIABILITY FOR
DISTRIBUTING INFORMATION ON
OUR WEBSITE                    We may be subjected to claims based on negligence
                               or other theories relating to the information we
                               distribute. Similarly, we may be subjected to
                               claims for defamation or copyright or trademark
                               infringement relating to the information we
                               provide in our products. These types of claims
                               have been brought, sometimes successfully,
                               against on-line services as well as print
                               publications in the past. We also could be
                               subjected to claims based upon the content that
                               is accessible from our products through links to
                               other Websites. These types of claims could be
                               time-consuming and expensive to defend, and could
                               result in the diversion of our management's time
                               and attention. In addition, if our products
                               provide faulty or inaccurate information, or fail
                               to provide all the information a user expects, we
                               could be subject to legal liability. Our
                               insurance and contractual provisions with users
                               and information providers may not protect us
                               against these types of claims.
 
   
IF OUR SOFTWARE IS
DEFECTIVE, IT MIGHT BE COSTLY
TO CORRECT; WE COULD GET
SUED AND OUR REPUTATION COULD
BE HARMED                      Complex software like the software we develop for
                               our products may contain errors or defects,
                               especially when first implemented, that may be
                               very costly to correct. Defects or errors also
                               could result in downtime and our business could
                               suffer significantly from potential adverse
                               customer reaction, negative publicity and harm to
                               our reputation.
    
 
                                       12
<PAGE>   14
 
   
WE MAY EXPERIENCE
SIGNIFICANT FLUCTUATIONS IN
OUR QUARTERLY RESULTS,
WHICH MAKES IT DIFFICULT FOR
INVESTORS TO MAKE RELIABLE
PERIOD-TO-PERIOD COMPARISONS
AND CONTRIBUTES TO VOLATILITY
IN THE MARKET PRICE FOR OUR
COMMON STOCK                   Our quarterly revenues, gross profits and results
                               of operations have fluctuated significantly in
                               the past and we expect them to continue to
                               fluctuate significantly in the future. In
                               addition, we believe that an important measure of
                               our business is the annualized contract value at
                               the end of each period, which also may fluctuate.
                               Causes of such fluctuations have included and may
                               include, among other factors:
    
 
                               - changes in demand for our products
 
                               - the dollar value and timing of both new and
                                 renewal subscriptions
 
                               - competition (particularly price competition)
 
   
                               - increases in selling and marketing expenses, as
                                 well as other operating expenses
    
 
                               - technical difficulties or system downtime
                                 affecting our products on the Web generally
 
                               - economic conditions specific to the Web, as
                                 well as general economic conditions
 
                               - consolidation of our customers
 
   
                               In addition, a substantial portion of our
                               expenses, including most product development and
                               selling and marketing expenses, must be incurred
                               in advance of revenue generation. If our
                               projected revenue does not meet our expectations,
                               then we are likely to experience an even larger
                               shortfall in our operating profit (loss) relative
                               to our expectations.
    
 
                               Any one or more of these factors could affect our
                               business, financial condition and results of
                               operations, and this makes the prediction of
                               results of operations on a quarterly basis
                               unreliable. As a result, we believe that
                               period-to-period comparisons of our historical
                               results of operations and annualized contract
                               values are not necessarily meaningful and that
                               you should not rely on them as an indication for
                               future performance. Also, due to these and other
                               factors, it is possible that our quarterly
                               results of operations (including the annualized
                               contract value) may be below the expectations of
                               public market analysts and investors. If this
                               happens, the price of our common stock would
                               likely decrease.
 
   
WE WOULD HAVE DIFFICULTY
REPLACING KEY PERSONNEL
WHOSE SERVICES ARE
IMPORTANT TO OUR SUCCESS       Our future success depends on the continued
                               services of a number of key employees, including
                               Daniel J. Schimmel, our President and Chief
                               Executive Officer, James A. Becker, our Vice
                               President, Global Strategic Web Applications
                               Team, Philip J. Garlick, our Vice President,
                               Global Enterprise Sales and Marketing, Mark C.
                               VanDine, our Vice President, Engineering and Roy
                               D. Landon, our Vice President, Finance
    
 
                                       13
<PAGE>   15
 
                               and Administration. We also depend on a limited
                               number of engineers to monitor the performance
                               and availability of our complex network and to
                               perform the necessary updates and repairs. We do
                               not have employment contracts with our key
                               personnel. If any of our key employees leave, the
                               loss of their technological knowledge and
                               industry expertise would seriously impede the
                               development of new products and services and our
                               ability to manage our business. The loss of one
                               or a group of our key employees could adversely
                               affect our future financial results.
 
   
THERE IS INTENSE
COMPETITION FOR QUALIFIED
PERSONNEL NECESSARY TO THE
SUCCESS OF OUR BUSINESS        Our future performance also depends upon our
                               ability to attract and retain highly-qualified
                               technical, sales and managerial personnel.
                               Qualified personnel are in great demand
                               throughout the software and Internet industries
                               and there is intense competition for such
                               personnel. In addition, competition for qualified
                               personnel may lead to increased costs for
                               personnel. If we do not succeed in retaining our
                               personnel or in attracting new employees, our
                               business could suffer significantly.
    
 
   
WE ARE SUBJECT TO RISKS OF
OPERATING INTERNATIONALLY      Revenue from customers located outside North
                               America accounted for 23% in 1998, 20% in 1997
                               and 17% in 1996 of our total revenue for those
                               years. Over time, we expect revenue from
                               international operations, principally in Europe,
                               to increase as a percentage of our total revenue.
                               As a result, we may be exposed to a number of
                               risks customary for international operations,
                               including:
    
 
                               - difficulties relating to managing an
                                 international sales force
 
                               - the burdens of complying with a wide variety of
                                 foreign laws
 
                               - the uncertainty of laws and enforcement in
                                 certain countries relating to the protection of
                                 intellectual property
 
                               - multiple and possibly overlapping tax
                                 structures
 
                               - economic or political changes in international
                                 markets
 
                               - currency and exchange rate fluctuations
 
                               - adverse tax consequences of returning any
                                 earnings of our foreign operations back to the
                                 United States
 
                               To date, we have not used risk management
                               techniques or "hedged" the risks associated with
                               fluctuations in foreign exchange rates.
 
WE ARE SUBJECT TO RISKS
ASSOCIATED WITH YEAR 2000
PROBLEMS                       Many existing computer systems and software
                               products do not properly recognize dates after
                               December 31, 1999. This "Year 2000" problem could
                               result in miscalculations, data corruption,
                               system failures or disruptions of operations. We
                               are subject to potential Year 2000 problems
                               affecting telecommunication
 
                                       14
<PAGE>   16
 
   
                               services, customers, our products, our internal
                               systems and the systems of our hosting facility
                               and our information providers, any of which could
                               have a material adverse effect on our business,
                               financial condition and results of operations. We
                               also have identified third-party software as
                               non-compliant, and several internal systems need
                               to be addressed as part of our relocation in June
                               1999. For more information, see "Management's
                               Discussion and Analysis of Financial Condition
                               and Results of Operations--Year 2000 Readiness
                               Disclosure Statement." Furthermore, as we
                               approach the Year 2000, customers may be forced
                               to devote greater resources to comply with Year
                               2000 requirements and as a result purchase fewer
                               products from us, which would have an adverse
                               effect on our net revenues.
    
 
   
OUR EXISTING OFFICERS AND
DIRECTORS, RATHER THAN
OUTSIDE
STOCKHOLDERS, WILL CONTINUE
TO CONTROL ONESOURCE           Following this offering, our officers and
                               directors, together with their affiliated
                               entities, will beneficially own approximately 67%
                               of our outstanding shares of common stock. As a
                               result, these stockholders acting together will
                               be able to take any of the following actions
                               without the approval of our public stockholders:
    
 
                               - elect our directors
 
                               - amend our charter or approve a merger, sale of
                                 assets or other major corporate transaction
 
                               - defeat any non-negotiated takeover attempt that
                                 may be beneficial to our public stockholders
 
                               - otherwise control the outcome of all matters
                                 submitted for a stockholder vote
 
   
THE OFFERING WILL BENEFIT
WILLIAM BLAIR & COMPANY,
L.L.C., ONE OF THE
UNDERWRITERS                   William Blair Venture Partners III Limited
                               Partnership, one of the selling stockholders and
                               an affiliate of William Blair, will receive
                               approximately $8.0 million or 20% of the gross
                               proceeds of this offering with respect to the
                               sale of common stock offered by this prospectus.
                               In addition, William Blair Venture Partners owns
                               329,669 shares of Class P common stock and will
                               participate in the reclassification. We have also
                               agreed to pay William Blair Venture Partners a
                               $0.5 million fee upon the closing of this
                               offering to terminate an oral management
                               agreement between us. Accordingly, this offering
                               will provide significant benefits to William
                               Blair Venture Partners. For more information, see
                               "Certain Transactions."
    
 
   
THE RULES OF THE NATIONAL
ASSOCIATION OF SECURITIES
DEALERS REQUIRE THE USE OF
A
QUALIFIED INDEPENDENT
UNDERWRITER IN THIS
OFFERING                       The rules of the NASD provide that no NASD member
                               may participate in a public offering of an
                               affiliated issuer's securities unless a qualified
                               independent underwriter has been engaged on the
                               terms provided in the rules. William Blair
                               Venture Partners, one of the selling
                               stockholders, is an affiliate
    
 
                                       15
<PAGE>   17
 
   
                               of William Blair and, therefore, William Blair
                               may be defined as an affiliate of ours. In
                               addition, Mr. Newmark, a principal of William
                               Blair, currently serves on our board of directors
                               as the representative of William Blair Venture
                               Partners. In view of our affiliation with William
                               Blair, U.S. Bancorp Piper Jaffray Inc. has agreed
                               to act as the qualified independent underwriter
                               in this offering. In its capacity as the
                               qualified independent underwriter, U.S. Bancorp
                               Piper Jaffray has participated in the preparation
                               of the prospectus and conducted due diligence as
                               part of such preparation. The initial public
                               offering price for the common stock can be no
                               higher than that recommended by U.S. Bancorp
                               Piper Jaffray acting as the qualified independent
                               underwriter.
    
 
   
THE OFFERING WILL BENEFIT
SELLING STOCKHOLDERS           The selling stockholders will receive substantial
                               proceeds and other benefits in connection with
                               this offering. In addition, a selling stockholder
                               and an affiliate of another selling stockholder
                               will each receive a payment of $0.5 million out
                               of OneSource's net proceeds to terminate a
                               management fee arrangement. For more information,
                               see "Certain Transactions." The offering will
                               also establish a public market for the common
                               stock and provide significantly increased
                               liquidity to our existing stockholders and
                               optionholders.
    
 
   
THERE IS NO TRADING MARKET
FOR OUR COMMON STOCK; ITS
FUTURE MARKET VALUE IS
UNCERTAIN                      Before this offering, there was no public market
                               for our common stock. We and the underwriters
                               will determine the initial public offering price
                               of our common stock based on negotiations between
                               us concerning the proper valuation of our common
                               stock. Nevertheless, after this offering, you may
                               not be able to resell your shares at or above the
                               initial public offering price due to a number of
                               factors, including:
    
 
                               - actual or anticipated fluctuations in our
                                 operating results or annualized contract values
 
                               - changes in expectations as to our future
                                 financial performance
 
                               - changes in securities analysts' financial
                                 estimates
 
                               - the operating and stock price performance of
                                 our competitors and other comparable companies
 
                               In addition, the stock market in general, and the
                               stocks of Web-based businesses in particular,
                               have experienced extreme volatility that often
                               has been unrelated to the operating performance
                               of particular companies. These broad market and
                               industry fluctuations may adversely affect the
                               trading price of our common stock, regardless of
                               our actual operating performance. You should read
                               the "Underwriting" section for a more complete
                               discussion of the factors that the
 
                                       16
<PAGE>   18
 
                               underwriters and we considered in determining the
                               initial public offering price.
 
   
OTHER SHARES MAY BE SOLD IN
THE FUTURE; THIS COULD
DEPRESS
THE MARKET PRICE FOR OUR
COMMON STOCK                   After this offering, we will have 9,926,500
                               shares of common stock outstanding and will have
                               reserved an additional 5,293,005 shares of common
                               stock for issuance pursuant to our stock option
                               and purchase plans and outstanding warrants. We
                               intend to register for resale the shares of
                               common stock reserved for issuance under our
                               stock option and stock purchase plans
                               approximately 90 days after the date of this
                               prospectus. The federal securities laws impose
                               restrictions on the ability of stockholders who
                               acquired their shares prior to the offering to
                               resell their shares. In addition, our officers
                               and directors have agreed not to sell their
                               shares for a period of 180 days after the date of
                               this prospectus.
    
 
                               If a large number of our shares of common stock
                               are sold following this offering, the price of
                               our common stock would likely decrease.
 
   
PURCHASERS OF OUR COMMON
STOCK IN THIS OFFERING WILL
INCUR IMMEDIATE AND
SUBSTANTIAL DILUTION           The initial public offering price of our common
                               stock is substantially higher than the net
                               tangible book value per share of common stock
                               will be after the offering. The net tangible book
                               value per share of common stock is calculated by
                               subtracting total liabilities from total tangible
                               assets and dividing by the number of shares
                               outstanding. Purchasers of common stock offered
                               by OneSource will pay total consideration that
                               represents approximately 85% of all consideration
                               ever received by us for our stock but they will
                               own approximately 25% of our outstanding common
                               stock.
    
 
   
OUR ANTI-TAKEOVER
PROVISIONS
MAY HAVE ADVERSE EFFECTS       Our restated certificate of incorporation and
                               amended and restated by-laws contain
                               anti-takeover provisions that could have the
                               effect of delaying or preventing changes in our
                               management, even if such changes would benefit
                               our public stockholders. For example, following
                               the closing of this offering, the board of
                               directors may issue up to one million shares of
                               preferred stock without any further vote or
                               action by the stockholders. The preferred stock
                               could have voting, liquidation, dividend and
                               other rights superior to those of the common
                               stock, and, therefore, any issuance of preferred
                               stock could adversely affect your rights as a
                               common stockholder. These factors could cause the
                               market price of the common stock to decrease.
    
 
                                       17
<PAGE>   19
 
   
                                RECLASSIFICATION
    
 
   
     Prior to the consummation of this offering, OneSource will reclassify all
of its outstanding shares of capital stock into a single class of common stock
and will authorize a single class of undesignated preferred stock. Each share of
Class P common stock will be reclassified into shares of common stock. Each
share of Class P common stock is entitled to a payment upon any distribution by
OneSource to holders of its capital stock in an amount equal to the original
cost of such share plus a preferential amount which accrues on a daily basis at
a rate of 12% per annum on such cost, compounded quarterly. As of March 31,
1999, the aggregate preference amount of the outstanding Class P common stock
was $3.3 million, based on an original cost per share of $4.91. In connection
with the reclassification, each outstanding share of Class P common stock will
be reclassified into one share of common stock plus an additional number of
shares of common stock determined by dividing the applicable preference amount
for such share by the value of a share of common stock based on the initial
public offering price in the offering. Based on an assumed initial public
offering price of $11.00 per share and the aggregate preference amount at March
31, 1999, an aggregate of 1,021,230 shares of common stock would be issued upon
the reclassification of all shares of Class P common stock and 304,111 shares of
common stock would be repurchased. Fractional shares otherwise issuable will be
rounded down to the nearest whole number. OneSource intends to repurchase all of
the shares of common stock issued with respect to the preference amount at the
initial public offering price prior to the completion of this offering.
    
 
                                       18
<PAGE>   20
 
                                USE OF PROCEEDS
 
   
     We estimate our net proceeds from the issuance and sale of the 2,500,000
shares of common stock being offered by OneSource to be approximately $24.8
million, at an assumed initial public offering price of $11.00 per share, after
deducting the estimated underwriting discount and offering expenses. We will not
receive any proceeds from the sale of the common stock by the selling
stockholders.
    
 
   
     The principal purposes of this offering are to:
    
 
   
     - repay debt
    
 
   
     - terminate current management fee arrangements
    
 
   
     - obtain working capital
    
 
   
     - establish a public market for our common stock and increase our
       visibility in the marketplace
    
 
   
     - facilitate future access to public capital markets
    
 
   
     - provide liquidity to existing stockholders and optionholders
    
 
   
     We intend to use approximately $6.8 million of the net proceeds to us to
repay principal and interest on a note issued by OneSource to Lotus Development
Corporation in connection with the purchase of OneSource's business from Lotus
in 1993. The note bears interest at the rate of 8% per year and is due September
8, 2000, unless accelerated upon the occurrence of any one of several events.
The completion of this offering would require OneSource to repay a significant
portion of the note if we do not repay it in full. We also intend to pay $0.5
million to each of William Blair Venture Partners III Limited Partnership and an
affiliate of Information Partners Capital Fund, L.P. to terminate management fee
arrangements. For more information, see "Certain Transactions."
    
 
   
     We intend to use the remaining net proceeds for general corporate purposes,
including working capital, and we may also use a portion of the net proceeds to
acquire or invest in complementary businesses or products or to obtain the right
to use complementary technologies. While we discuss potential acquisitions and
investments from time to time, we currently have no commitments or agreements
for any such acquisitions or investments. Pending these uses, our remaining net
proceeds of the offering will be invested in short-term, interest-bearing,
investment-grade securities, certificates of deposit or direct or guaranteed
obligations of the United States.
    
 
                                DIVIDEND POLICY
 
     We have never paid any cash dividends on our common stock and do not
anticipate paying any cash dividends in the foreseeable future.
 
                                       19
<PAGE>   21
 
                                 CAPITALIZATION
 
   
     The left-hand column in the following table sets forth OneSource's
capitalization as of March 31, 1999. The middle column gives pro forma effect to
the reclassification of OneSource's Class P common stock into common stock and
the filing of our restated certificate of incorporation, each prior to the
completion of this offering. The right-hand column sets forth OneSource's pro
forma capitalization as of March 31, 1999, as further adjusted to reflect all of
the following as if they occurred on March 31, 1999:
    
 
   
     - the sale of 2,500,000 shares of common stock by OneSource in this
       offering at an assumed initial public offering price of $11.00 per share
    
 
   
     - the use of approximately $6.8 million of the estimated net proceeds to
       repay a note payable to Lotus
    
 
   
     - the use of $1.0 million to pay a fee for terminating management fee
       arrangements
    
 
   
     - the exercise of an outstanding warrant to purchase 15,696 shares of
       common stock at $0.06 per share by a selling stockholder
    
 
   
     - the repurchase of common stock issued in respect of the preference amount
       on the Class P common stock in the reclassification
    
 
     You should read the data set forth below in conjunction with "Management's
Discussion and Analysis of Financial Condition and Results of Operations" and
the Consolidated Financial Statements and Notes thereto appearing elsewhere in
this prospectus.
 
   
<TABLE>
<CAPTION>
                                                                       MARCH 31, 1999
                                                            ------------------------------------
                                                                                      PRO FORMA
                                                             ACTUAL     PRO FORMA    AS ADJUSTED
                                                            --------    ---------    -----------
<S>                                                         <C>         <C>          <C>
Current portion of capital lease obligations..............  $    401    $    401      $    401
                                                            ========    ========      ========
Long-term debt and capital lease obligations..............     6,449       6,449           179
                                                            --------    --------      --------
Stockholders' equity (deficit):
  Preferred stock, $0.01 par value; 1,000,000 shares
     authorized, no shares issued or outstanding, actual,
     pro forma and pro forma as adjusted..................        --          --            --
  Class P common stock, $0.01 par value; 1,250,000 shares
     authorized, 717,119 shares issued and outstanding,
     actual; no shares authorized, issued or outstanding,
     pro forma and pro forma as adjusted..................     3,524          --            --
  Common stock, $0.01 par value; 20,000,000 shares
     authorized, 6,693,685, 7,714,915 and 9,926,500 shares
     issued and outstanding, actual, pro forma and pro
     forma as adjusted....................................        67          77            99
  Additional paid-in capital..............................     1,176       4,690        26,148
  Unearned compensation...................................      (464)       (464)         (464)
  Accumulated deficit.....................................   (10,856)    (10,856)      (12,109)
  Accumulated other comprehensive loss....................      (102)       (102)         (102)
                                                            --------    --------      --------
     Total stockholders' equity (deficit).................  $ (6,655)   $ (6,655)     $ 13,572
                                                            --------    --------      --------
          Total capitalization............................  $    206    $    206      $ 13,751
                                                            ========    ========      ========
</TABLE>
    
 
   
     The number of shares of common stock issued and outstanding, pro forma as
adjusted, excludes 4,393,005 shares of common stock issuable upon the exercise
of stock options and
    
 
                                       20
<PAGE>   22
 
   
warrants outstanding at a weighted average exercise price of $1.95, and an
aggregate of 900,000 shares reserved for future stock option grants and
purchases under OneSource's equity compensation plans. For more information, see
"Management--Equity Plans" and Notes 7 and 8 to the Consolidated Financial
Statements.
    
 
   
                                    DILUTION
    
 
   
     Purchasers of our common stock in this offering will incur immediate and
substantial dilution because the assumed initial public offering price of our
common stock is substantially higher than the pro forma net tangible book value
per share of common stock will be after this offering. The pro forma net
tangible book value deficit of OneSource as of March 31, 1999 was $(6.7)
million, or $(0.86) per share. Pro forma net tangible book value per share
represents the amount of total tangible assets less total liabilities, divided
by the number of shares of common stock outstanding after giving effect to the
reclassification of Class P common stock into common stock. After giving effect
to the sale of the 2,500,000 shares of common stock offered by OneSource and the
application of the estimated net proceeds to OneSource, the pro forma net
tangible book value of OneSource as of March 31, 1999, would have been $13.6
million, or $1.37 per share. This represents an immediate increase in pro forma
net tangible book value of $2.23 per share to existing stockholders and an
immediate "dilution" of $9.63 per share to investors purchasing common stock in
this offering. The following table illustrates this per share dilution:
    
 
   
<TABLE>
<S>                                                           <C>       <C>
Assumed initial public offering price.......................            $11.00
  Pro forma net tangible book value deficit per share as of
     March 31, 1999.........................................  $(0.86)
  Increase per share attributable to new investors..........    2.23
                                                              ------
Pro forma net tangible book value per share after this
  offering..................................................              1.37
                                                                        ------
Dilution per share to new investors.........................            $ 9.63
                                                                        ======
</TABLE>
    
 
   
     The following table summarizes the difference between the number of shares
of common stock purchased from OneSource, the total consideration paid to
OneSource, and the average price per share paid by existing stockholders and by
new investors:
    
 
   
<TABLE>
<CAPTION>
                                       SHARES PURCHASED        TOTAL CONSIDERATION
                                     ---------------------    ----------------------    AVERAGE PRICE
                                       NUMBER      PERCENT      AMOUNT       PERCENT      PER SHARE
                                     ----------    -------    -----------    -------    -------------
<S>                                  <C>           <C>        <C>            <C>        <C>
Existing stockholders..............   7,426,500      74.8%    $ 4,768,000      14.8%       $ 0.64
New investors......................   2,500,000      25.2      27,500,000      85.2        $11.00
                                     ----------     -----     -----------     -----
     Total.........................   9,926,500     100.0%    $32,268,000     100.0%
                                     ==========     =====     ===========     =====
</TABLE>
    
 
   
     The foregoing tables assume no exercise of the options or the warrants
outstanding to purchase an additional 4,393,005 shares of common stock at a
weighted average exercise price of $1.95 per share. To the extent these options
or warrants are exercised, there will be further dilution to new shareholders in
the net tangible book value of their shares. For more information, see
"Management--Equity Plans." In addition, the second table does not reflect the
sale of 1,136,000 shares by the selling stockholders in this offering. These
sales will reduce the shares held by existing shareholders to 63.4% of the total
shares of common stock to be outstanding after this offering, and will increase
the number of shares to be purchased by the new shareholders to 36.6% of the
total shares of common stock to be outstanding after this offering. For more
information, see "Principal and Selling Stockholders."
    
 
                                       21
<PAGE>   23
 
                      SELECTED CONSOLIDATED FINANCIAL DATA
 
   
     The selected consolidated financial data set forth below should be read in
conjunction with OneSource's Consolidated Financial Statements and Notes thereto
and "Management's Discussion and Analysis of Financial Condition and Results of
Operations," appearing elsewhere in this prospectus. The consolidated statement
of operations data for the years ended December 31, 1996, 1997 and 1998, and the
consolidated balance sheet data as of December 31, 1997 and 1998, have been
derived from, and are qualified by reference to, OneSource's audited
Consolidated Financial Statements and Notes appearing elsewhere in this
prospectus. The consolidated statement of operations data for the years ended
December 31, 1994 and 1995, and the consolidated balance sheet data as of
December 31, 1994, 1995 and 1996, have been derived from OneSource's audited
Consolidated Financial Statements that do not appear in this prospectus.
Financial data as of March 31, 1998 and 1999, and for the three month periods
ended March 31, 1998 and 1999, are derived from unaudited Consolidated Financial
Statements appearing elsewhere in this prospectus, and, in the opinion of
management, include all adjustments, consisting only of normal recurring
adjustments, that OneSource considers necessary for a fair presentation of its
financial position and results of operations for such periods. The historical
results are not necessarily indicative of the operating results to be expected
in the future.
    
 
   
<TABLE>
<CAPTION>
                                                                                               THREE MONTHS ENDED
                                                  YEAR ENDED DECEMBER 31,                           MARCH 31,
                                 ----------------------------------------------------------   ---------------------
                                   1994        1995        1996        1997         1998        1998        1999
                                 ---------   ---------   ---------   ---------   ----------   ---------   ---------
                                                                                                   (UNAUDITED)
                                                                   (IN THOUSANDS)
<S>                              <C>         <C>         <C>         <C>         <C>          <C>         <C>
STATEMENT OF OPERATIONS DATA:
Revenues:(1)
  Web-based product............  $      --   $      --   $      15   $   3,312   $   16,058   $   2,628   $   6,903
  CD Rom product...............     30,300      28,957      30,419      27,072       14,370       5,322       1,240
                                 ---------   ---------   ---------   ---------   ----------   ---------   ---------
  Total revenues...............     30,300      28,957      30,434      30,384       30,428       7,950       8,143
                                 ---------   ---------   ---------   ---------   ----------   ---------   ---------
Cost of revenues:
  Web-based product............         --          --         295       2,401        7,863       1,287       2,970
  CD Rom product...............     12,380      11,520      12,244      10,444        5,792       1,979         487
                                 ---------   ---------   ---------   ---------   ----------   ---------   ---------
  Total cost of revenues.......     12,380      11,520      12,539      12,845       13,655       3,266       3,457
                                 ---------   ---------   ---------   ---------   ----------   ---------   ---------
Gross profit...................     17,920      17,437      17,895      17,539       16,773       4,684       4,686
                                 ---------   ---------   ---------   ---------   ----------   ---------   ---------
Operating expenses:
  Selling and marketing........     11,231       8,705       8,572       9,167       11,577       2,797       2,927
  Platform and product
    development................      5,512       6,585       7,252       6,375        6,313       1,561       1,718
  General and administrative...      6,516       5,163       3,664       3,401        3,847         957         860
                                 ---------   ---------   ---------   ---------   ----------   ---------   ---------
  Total operating expenses.....     23,259      20,453      19,488      18,943       21,737       5,315       5,505
                                 ---------   ---------   ---------   ---------   ----------   ---------   ---------
Loss from operations...........     (5,339)     (3,016)     (1,593)     (1,404)      (4,964)       (631)       (819)
Interest income (expense),
  net..........................       (515)       (633)       (733)       (930)        (595)       (244)        (93)
Gain on sale of product line...         --          --          --         501       12,797          --          --
Other income...................         --          --         393          --           --          --         500
                                 ---------   ---------   ---------   ---------   ----------   ---------   ---------
Income (loss) before income
  taxes........................     (5,854)     (3,649)     (1,933)     (1,833)       7,238        (875)       (412)
Provision (benefit) for income
  taxes........................       (473)         --          --          --          250          --          --
                                 ---------   ---------   ---------   ---------   ----------   ---------   ---------
Net income (loss)..............     (5,381)     (3,649)     (1,933)     (1,833)       6,988        (875)       (412)
Less: income (loss)
  attributable to Class P
  common stock.................       (122)        104         335         414        1,367          72         139
                                 ---------   ---------   ---------   ---------   ----------   ---------   ---------
Income (loss) attributable to
  common stock.................  $  (5,259)  $  (3,753)  $  (2,268)  $  (2,247)  $    5,621   $    (947)  $    (551)
                                 =========   =========   =========   =========   ==========   =========   =========
</TABLE>
    
 
                                       22
<PAGE>   24
 
   
<TABLE>
<CAPTION>
                                                                                               THREE MONTHS ENDED
                                                  YEAR ENDED DECEMBER 31,                           MARCH 31,
                                 ----------------------------------------------------------   ---------------------
                                   1994        1995        1996        1997         1998        1998        1999
                                 ---------   ---------   ---------   ---------   ----------   ---------   ---------
                                                                                                   (UNAUDITED)
<S>                              <C>         <C>         <C>         <C>         <C>          <C>         <C>
Earnings (loss) per share:(2)
  Class P common stock:
    Basic and diluted earnings
      (loss) per share.........  $   (0.17)  $    0.14   $    0.47   $    0.58   $     1.91   $    0.10   $   $0.19
    Weighted average Class P
      common shares
      outstanding..............    724,257     723,239     718,966     717,948      717,541     717,948     717,119
  Common stock:
    Basic earnings (loss) per
      share....................  $   (0.81)  $   (0.57)  $   (0.35)  $   (0.34)  $     0.85   $   (0.14)  $   (0.08)
    Diluted earnings (loss) per
      share....................  $   (0.81)  $   (0.57)  $   (0.35)  $   (0.34)  $     0.59   $   (0.14)  $   (0.08)
    Weighted average common
      shares outstanding:
      Basic....................  6,525,087   6,522,629   6,486,959   6,545,343    6,640,834   6,620,952   6,685,164
      Diluted..................  6,525,087   6,522,629   6,486,959   6,545,343    9,563,151   6,620,952   6,685,164
  Unaudited pro forma earnings
    per share:(3)
    Basic......................                                                  $     0.91               $   (0.05)
    Diluted....................                                                  $     0.66               $   (0.05)
    Weighted average common
      shares outstanding
      Basic....................                                                   7,644,012               7,706,409
      Diluted..................                                                  10,566,326               7,706,409
</TABLE>
    
 
   
<TABLE>
<CAPTION>
                                                DECEMBER 31,                               MARCH 31,
                            -----------------------------------------------------    ----------------------
                             1994       1995        1996        1997       1998       1998         1999
                            -------    -------    --------    --------    -------    -------    -----------
                                                                                          (UNAUDITED)
                                            (IN THOUSANDS, EXCEPT NUMBER OF CUSTOMERS DATA)
<S>                         <C>        <C>        <C>         <C>         <C>        <C>        <C>
BALANCE SHEET DATA:
Cash and cash
  equivalents.............  $ 1,378    $   966    $    535    $    341    $ 8,665    $   379      $ 6,739
Working capital
  (deficit)...............   (7,431)    (7,499)     (8,803)     (9,792)    (2,118)   (10,105)      (3,001)
Total assets..............   19,396     16,567      16,934      16,644     27,646     14,401       20,723
Total debt (including
  capital lease
  obligations)............    4,755      6,223       6,661       8,171      6,936      8,908        6,850
Deferred revenues.........   13,818     14,160      15,419      15,748     18,022     14,983       15,293
Total stockholders'
  deficit.................   (6,116)    (9,757)    (11,827)    (13,613)    (6,311)   (14,503)      (6,655)
 
OTHER DATA FOR WEB-BASED
  PRODUCTS (UNAUDITED):
Annualized contract
  value(4)................  $    --    $    --    $    412    $  8,973    $25,920    $11,854      $28,338
Number of customers.......       --         --          11         233        445        279          460
Average annualized
  contract value per
  customer................  $    --    $    --    $   37.4    $   38.5    $  58.2    $  42.5      $  61.6
</TABLE>
    
 
- ------------
 
   
(1) In 1997 and 1998, OneSource divested two CD Rom product lines. Revenues
    attributable to these divested product lines, which are included in the
    statement of operations data through the divestiture date, were $5,713,000,
    $6,002,000, $6,415,000, $6,630,000, $2,612,000 and $1,554,000 in the years
    ended December 31, 1994, 1995, 1996, 1997 and 1998 and the three months
    ended March 31, 1998, respectively.
    
 
(2) You should read Notes 2 and 5 to the Consolidated Financial Statements for
    further description of the calculation of these items.
 
   
(3) Unaudited pro forma basic and diluted earnings per share of common stock for
    the year ended December 31, 1998 and for the three months ended March 31,
    1999 have been calculated based on net income attributable to all classes of
    common stock and assuming the reclassification of OneSource's Class P common
    stock prior to the
    
 
                                       23
<PAGE>   25
 
   
    completion of this offering as if it had occurred at January 1, 1998 and
    January 1, 1999, respectively. In the reclassification, each share of Class
    P common stock will be reclassified into one share of common stock plus an
    additional number of shares of common stock determined by dividing the
    preference amount for such share by the initial public offering price per
    share.
    
 
   
(4) Annualized contract value represents the invoiced fees for one month for all
    customer contracts for Web-based products in effect at the measurement date,
    multiplied by 12, without regard to the actual remaining duration of such
    contracts. For more information regarding annualized contract value, see
    "Management's Discussion and Analysis of Financial Condition and Results of
    Operations -- Overview -- Annualized Contract Value."
    
 
                                       24
<PAGE>   26
 
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
   
OVERVIEW -- GENERAL
    
 
     OneSource provides Web-based business and financial information to
professionals who need quick access to reliable corporate, industry and market
intelligence. OneSource was formed as a division of Lotus in 1987 and became an
independent company when it was purchased in a management buy-out in 1993. Until
December 1996, our business was to provide business information to the financial
community using CD Rom technology as the primary method of distribution. The
introduction of Business Browser in December 1996 marked a fundamental shift in
our business as we began a transition away from our legacy CD Rom business and
toward Web-based products.
 
     Revenues from Web-based products accounted for $16.1 million, or 53% of
total revenues, for the year ended December 31, 1998 up from $3.3 million, or
11% of total revenues, for the year ended December 31, 1997. In the same period,
CD Rom product revenues decreased to $14.4 million, or 47% of total revenues for
the year ended December 31, 1998 from $27.1 million, or 89% of total revenues,
for the year ended December 31, 1997. As of December 31, 1998, 445 organizations
subscribed to our Business Browser product line, and the annualized contract
value for these organizations was $25.9 million.
 
   
     During this transition period, we utilized the cash flow from our CD Rom
business to fund a portion of the significant expenses incurred to build our
Web-based business. These expenses included the following:
    
 
   
     - platform and product development expenses to develop and enhance our
       Web-based products,
    
 
   
     - selling and marketing expenses to hire and train a Web-based sales force
       and to retrain a portion of our CD Rom-based sales force and
    
 
   
     - general and administrative expenses to build the necessary infrastructure
       to support our growing Web-based business.
    
 
     The gross margins on our Web-based business have also been adversely
impacted by certain royalty expenses and other costs of revenues which were
disproportionately high compared to Web-based revenues which were growing from
low initial levels. We believe that our operating margins will improve as we
more effectively leverage our Web-based royalty and infrastructure expenses and
eliminate costs incurred to support our legacy CD Rom products.
 
   
     In May 1998, we sold our CD-Insurance division to allow us to focus more
completely on our new Web-based product line. We recognized a gain of $12.8
million on this sale during 1998. In addition, in connection with the
disposition, we licensed certain of our CD Rom software to the acquiror in
exchange for $4.0 million of license fees. These license fees will be paid in
eight equal quarterly installments beginning January 1, 1999 and running through
December 31, 2000 and recognized ratably. These license fees are being
recognized as other income.
    
 
   
     Our revenues for both CD Rom and Web-based products consist of monthly
subscription fees from customer contracts. Customer contracts span varying
periods of time but are generally for one year, are renewable for like periods,
and are payable in advance. Subscription fees
    
 
                                       25
<PAGE>   27
 
generally are quoted to clients on an annual basis but are earned as revenues on
a monthly basis over the subscription period. Invoices are recorded as accounts
receivable until paid and as deferred revenues until earned. Deferred revenues
attributable to Web-based products increased 231% to $15.9 million as of
December 31, 1998 from $4.8 million as of December 31, 1997.
 
   
     Cost of revenues consists primarily of royalties to information providers
and, to a lesser extent, employee salaries and benefits, facilities allocation
and related expenses, depreciation associated with computers for data processing
and on-line requirements and Web hosting expenses. We enter into contracts with
our information providers which are generally for a term of at least one year
and are automatically renewable if not canceled with advance notice. These
contracts may be terminated under certain circumstances. For more information,
see "Risk Factors--If our information providers stopped doing business with us,
we could not continue to sell Business Browser." Under these arrangements,
royalties are generally paid on a quarterly basis to information providers.
Royalties generally are calculated either as a flat percentage of our revenues
or as a per-user fee that declines as the number of authorized users of the
product increases. In limited cases, we pay a fixed fee per period.
    
 
   
     Selling and marketing expense consists primarily of employee salaries and
benefits and sales commissions paid to our sales force, customer support
organization and marketing personnel, as well as facilities allocation and
related expenses, direct marketing promotional materials, trade show exhibitions
and advertising. Sales commissions are paid when customers are invoiced and are
recorded as deferred subscription costs, which are amortized ratably over the
term of the contract, typically 12 months, as the associated revenues are
recognized. All other selling and marketing costs are expensed as incurred.
    
 
   
     Platform and product development expense consists primarily of employee
salaries and benefits, facilities allocation and related expenses, as well as
outside contractor expenses, relating to the development of our "platform" of
core software supporting our products and the development of new products based
upon that platform. Platform and product development expense includes expenses
relating to the editorial staff that implements our KeyID technology to
integrate disparate information sources into our Web-based products.
    
 
   
     General and administrative expense consists primarily of employee salaries
and benefits, facilities allocation and related expenses associated with
OneSource's management, finance, human resources, management information systems
and administrative groups. In addition, we will incur non-recurring charges of
approximately $0.2 million in moving and related costs in June 1999 due to the
relocation of our headquarters from Cambridge to Concord, Massachusetts and
approximately $0.2 million of financial advisory fees. The quarterly management
fees of $25,000 paid to each of William Blair Venture Partners and an affiliate
of Information Partners Capital will cease in exchange for the payment of a $0.5
million termination fee to each of these parties upon completion of this
offering. For more information, see "Certain Transactions."
    
 
                                       26
<PAGE>   28
 
   
OVERVIEW -- ANNUALIZED CONTRACT VALUE
    
 
   
     One measure of the performance of our business is "annualized contract
value." This is a measurement we use for normalized period-to-period comparisons
to indicate business volume and growth, both in terms of new customers and
upgrades and expansions at existing customers. Our presentation and calculation
of annualized contract value may not be comparable to similarly titled measures
used by other companies. It is not an absolute indicator and we cannot guarantee
that any annualized contract value will be ultimately realized as revenues.
    
 
   
     Annualized contract value is calculated by multiplying by 12 the total
amount of fees invoiced for one month and included in deferred revenues for all
customer contracts for Web-based products at the measurement date. Deferred
revenues represent amounts invoiced under customer contracts in effect at the
measurement date but which have not been recognized as revenues pending delivery
of the subscription service. This calculation is illustrated by the table below
at each measurement date in the first column as follows:
    
 
   
     - the second column reflects total deferred revenues as reported in
       OneSource's consolidated financial statements
    
 
   
     - the third column reflects the portion of total deferred revenues in the
       second column pertaining only to Web-based products
    
 
   
     - the fourth column reflects the portion of deferred revenues for Web-based
       products in the third column which represents one month of invoiced fees
       under customer contracts
    
 
   
     - the fifth column reflects the total annualized contract value which is
       computed by multiplying the one month of invoiced fees included in
       deferred revenues in the fourth column by 12
    
 
   
<TABLE>
<CAPTION>
                                                                         ONE MONTH
                                                                        OF INVOICED
                                                TOTAL      WEB-BASED      FEES IN
                                               DEFERRED    DEFERRED      DEFERRED        ANNUALIZED
              MEASUREMENT DATE                 REVENUES    REVENUES      REVENUES      CONTRACT VALUE
              ----------------                 --------    ---------    -----------    --------------
                                                                   (IN THOUSANDS)
<S>                                            <C>         <C>          <C>            <C>
December 31, 1996............................  $15,419      $   316       $   34.3        $   411
December 31, 1997............................   15,748        4,756          747.8          8,973
December 31, 1998............................   18,022       15,935        2,160.0         25,920
 
March 31, 1998...............................   14,983        6,004          987.8         11,854
March 31, 1999...............................   15,293       14,205        2,361.5         28,338
</TABLE>
    
 
   
     We have increased annualized contract value attributable to Web-based
products 189% to $25.9 million as of December 31, 1998 from $9.0 million as of
December 31, 1997. The number of Web-based customers has increased 91%, to 445
at December 31, 1998 from 233 at December 31, 1997. At the same time, the
average annualized contract value of all Web-based product customers has
increased 51%, to $58,248 per customer at December 31, 1998 from $38,512 per
customer at December 31, 1997. The average annualized contract value for the
customers that were under contract at both December 31, 1997 and 1998 grew to
$76,143 per customer at December 31, 1998 from $38,512 per customer at December
31, 1997. This growth was attributable to an increase in the number of user
seats purchased by customers and the addition of new products.
    
 
                                       27
<PAGE>   29
 
   
     The renewal rate of the Business Browser product line for 1998 was 90%
calculated on a dollar basis. The renewal rate is measured by comparing a
customer's annualized contract value at December 31, 1998 to its annualized
contract value at December 31, 1997. The set of customers measured are those who
had subscriptions in effect at December 31, 1997.
    
 
   
RESULTS OF OPERATIONS
    
 
     The following table sets forth, for the periods indicated, the percentage
of total revenues represented by each line item in OneSource's consolidated
statement of operations. We can give no assurance that the indicated trends in
revenues or operating results will continue in the future.
 
   
<TABLE>
<CAPTION>
                                                                               THREE MONTHS
                                                                                  ENDED
                                                    YEAR ENDED DECEMBER 31,     MARCH 31,
                                                    -----------------------    ------------
                                                    1996     1997     1998     1998    1999
                                                    -----    -----    -----    ----    ----
                                                        (PERCENTAGE OF TOTAL REVENUES)
<S>                                                 <C>      <C>      <C>      <C>     <C>
Revenues:
  Web-based product...............................    --%      11%      53%     33%      85%
  CD Rom product..................................   100       89       47      67       15
                                                     ---      ---     ----     ---     ----
     Total revenues...............................   100      100      100     100      100
                                                     ---      ---     ----     ---     ----
Cost of revenues:
  Web-based product...............................     1        8       26      16       36
  CD Rom product..................................    40       34       19      25        6
                                                     ---      ---     ----     ---     ----
     Total cost of revenues.......................    41       42       45      41       42
                                                     ---      ---     ----     ---     ----
Gross profit......................................    59       58       55      59       58
Operating expenses:
  Selling and marketing...........................    28       30       38      35       36
  Platform and product development................    24       21       21      20       21
  General and administrative......................    12       11       12      12       11
                                                     ---      ---     ----     ---     ----
Loss from operations..............................    (5)      (4)     (16)     (8)     (10)
Interest income (expense), net....................    (2)      (3)      (2)     (3)      (1)
Gain on sale of product line......................    --        1       42      --       --
Other income......................................     1       --       --      --        6
                                                     ---      ---     ----     ---     ----
Income (loss) before income taxes.................    (6)      (6)      24     (11)      (5)
Provision for income taxes........................    --       --        1      --       --
Net income (loss).................................    (6)%     (6)%     23%    (11)%     (5)%
                                                     ===      ===     ====     ===     ====
</TABLE>
    
 
   
COMPARISON OF RESULTS FOR THE QUARTERS ENDED MARCH 31, 1999 AND 1998
    
 
   
     Revenues.  Total revenues increased 2% to $8.1 million for the quarter
ended March 31, 1999 from $8.0 million for the quarter ended March 31, 1998.
During the first quarter of 1998, CD Rom product revenues included revenues
attributable to our CD-Insurance division, which was sold in May 1998. Revenues
from this product line were $1.5 million for the quarter ended
    
 
                                       28
<PAGE>   30
 
   
March 31, 1998. Excluding these revenues from total revenues for the quarter
ended March 31, 1998, total revenues for the quarter ended March 31, 1999
increased by 25%.
    
 
   
     Web-based product revenues increased 163% to $6.9 million for the quarter
ended March 31, 1999 from $2.6 million for the quarter ended March 31, 1998. The
increase was attributable to the addition of new customers, an increase in the
number of user seats purchased by existing customers and the sale of new
products to existing customers. At the same time, CD Rom product revenues
decreased by 77% to $1.2 million in the first quarter of 1999 from $5.3 million
in the first quarter of 1998 as OneSource continues to transition away from its
legacy CD Rom business.
    
 
   
     Cost of Revenues.  Total cost of revenues increased 6% to $3.5 million for
the quarter ended March 31, 1999 from $3.3 million for the quarter ended March
31, 1998. As a percentage of total revenues, total cost of revenues increased to
42% for the quarter ended March 31, 1999 from 41% for the quarter ended March
31, 1998. The increase in total cost of revenues was principally due to
increased royalty expense for our Web-based products. It was offset partially by
a decrease in our costs of revenues relating to the CD Rom product line.
    
 
   
     Cost of Web-based product revenues increased 131% to $3.0 million for the
quarter ended March 31, 1999 from $1.3 million for the quarter ended March 31,
1998. As a percentage of Web-based product revenues, cost of Web-based product
revenues decreased to 43% for the quarter ended March 31, 1999 from 49% for the
quarter ended March 31, 1998, due to an increase in our customer base and
expansion of existing customers, which enabled OneSource to better leverage
royalty payments and infrastructure expenses.
    
 
   
     Cost of CD Rom product revenues decreased 75% to $0.5 million for the
quarter ended March 31, 1999 from $2.0 million for the quarter ended March 31,
1998. This decrease was due to decreased revenues reflecting our shift away from
the CD Rom product line. As a percentage of CD Rom product revenues, costs of CD
Rom product revenues increased to 39% for the quarter ended March 31, 1999 from
37% for the quarter ended March 31, 1998.
    
 
   
     Selling and Marketing Expense.  Selling and marketing expense increased 5%
to $2.9 million for the quarter ended March 31, 1999 from $2.8 million for the
quarter ended March 31, 1998, principally due to increased expenses incurred to
hire new sales personnel and to train new and existing personnel in connection
with our Business Browser product line. Selling and marketing expense increased
as a percentage of total revenues to 36% for the quarter ended March 31, 1999
from 35% for the quarter ended March 31, 1998.
    
 
   
     Platform and Product Development Expense.  Platform and product development
expense increased 10% to $1.7 million for the quarter ended March 31, 1999 from
$1.6 million for the quarter ended March 31, 1998. Platform and product
development expense increased as a percentage of total revenues to 21% for the
quarter ended March 31, 1999 from 20% for the quarter ended March 31, 1998. The
increase was due principally to increased headcount to meet new product demands.
    
 
   
     General and Administrative Expenses.  General and administrative expense
decreased 10% to $0.9 million for the quarter ended March 31, 1999 from $1.0
million for the quarter ended March 31, 1998. This decrease was the result of
personnel relocation expenses included in the first quarter of 1998. General and
administrative expense decreased as a percentage of total
    
 
                                       29
<PAGE>   31
 
   
revenues to 11% for the quarter ended March 31, 1999 from 12% for the quarter
ended March 31, 1998.
    
 
   
     Interest Expense, Net.  Interest expense, net of interest income, decreased
62% to $0.1 million for the quarter ended March 31, 1999 from $0.2 million for
the quarter ended March 31, 1998 due primarily to an increase in interest income
related to invested cash balances from the sale of the CD-Insurance division in
May 1998 and the reduction of interest expense related to working capital
borrowings.
    
 
   
     Other Income.  Other income increased $0.5 million for the quarter ended
March 31, 1999 and was attributable to a software license agreement in
connection with the sale of our CD-Insurance division for support services
provided during the period.
    
 
COMPARISON OF RESULTS FOR THE YEARS ENDED DECEMBER 31, 1998 AND 1997
 
   
     Revenues.  Total revenues remained at approximately the same level of $30.4
million for each of the years ended December 31, 1998 and 1997. In May 1998,
OneSource sold its CD-Insurance division. Revenues from this product line were
$2.6 million for the year ended December 31, 1998 compared to $6.6 million for
the year ended December 31, 1997. Excluding these revenues from total revenues
for each period, total revenues for the year ended December 31, 1998 increased
by 17%.
    
 
   
     Web-based product revenues increased by 385% to $16.1 million for the year
ended December 31, 1998 from $3.3 million for the year ended December 31, 1997.
The increase was attributable to new customers, an increase in the number of
user seats purchased by existing customers and the sale of new products to
existing customers. At the same time, CD Rom product revenues decreased by 47%
to $14.4 million in 1998 from $27.1 million in 1997 as OneSource continued its
transition away from its legacy CD Rom business.
    
 
     Cost of Revenues.  Total cost of revenues increased 6% to $13.7 million for
the year ended December 31, 1998 from $12.8 million for the year ended December
31, 1997. As a percentage of total revenues, total cost of revenues increased to
45% in 1998 from 42% in 1997. The increase in total cost of revenues was
principally due to increased royalty expense for our Web-based products. It was
offset partially by a decrease in our costs of revenues relating to the CD Rom
product line.
 
     Cost of Web-based product revenues increased 227% to $7.9 million for the
year ended December 31, 1998 from $2.4 million for the year ended December 31,
1997. As a percentage of Web-based product revenues, cost of Web-based product
revenues decreased to 49% in 1998 from 72% in 1997, due to an increase in our
customer base. Royalty expense increased as a result of growth in Business
Browser product line revenues and number of user seats sold.
 
     Cost of CD Rom product revenues decreased 45% to $5.8 million for the year
ended December 31, 1998 from $10.4 million for the year ended December 31, 1997.
This decrease was due to decreased revenues reflecting our shift away from the
CD Rom product line. As a percentage of CD Rom product revenues, cost of CD Rom
product revenues increased to 40% in 1998 from 39% in 1997.
 
     Selling and Marketing Expense.  Selling and marketing expense increased 26%
to $11.6 million for the year ended December 31, 1998 from $9.2 million for the
year ended December 31, 1997 principally due to increased expenses incurred to
hire new sales personnel
 
                                       30
<PAGE>   32
 
and to train new and existing personnel in connection with our transition to our
new Business Browser product line. Selling and marketing expense increased as a
percentage of total revenues to 38% in 1998 from 30% in 1997.
 
     Platform and Product Development Expense.  Platform and product development
expense decreased 1% to $6.3 million for the year ended December 31, 1998 from
$6.4 million for the year ended December 31, 1997, although as a percentage of
total revenues it remained constant at 21%. The decrease was due principally to
the decrease in salary expense resulting from the elimination of CD-Insurance
product development staff in May 1998 upon the sale of that division and the
elimination of several CD Rom product management positions. This decrease in
salary expense was offset by increased headcount in the Global Strategic Web
Applications Team to meet new product demands.
 
     General and Administrative Expense.  General and administrative expense
increased 13% to $3.8 million for the year ended December 31, 1998 from $3.4
million for the year ended December 31, 1997 principally due to increased
headcount in management information systems and human resources for
infrastructure required to accommodate the growth in our business. General and
administrative expense increased as a percentage of total revenues to 12% in
1998 from 11% in 1997.
 
     Interest Expense, Net.  Interest expense, net of interest income, decreased
36% to $0.6 million for the year ended December 31, 1998 from $0.9 million for
the year ended December 31, 1997 due to an increase in interest income related
to invested cash balances from the sale of the CD-Insurance product line in May
1998.
 
     Gain on Sale of Product Line.  As a result of the sale of the CD-Insurance
division, we recorded a gain of $12.8 million. This gain reflects cash proceeds
received of $11.0 million together with recognition of deferred revenues of $3.1
million and $0.6 million of deferred subscription costs due to the transfer of
related service obligations, net of transaction related expenses.
 
     Income Taxes.  The income tax provision for the year ended December 31,
1998 was $0.3 million and is directly related to the gain on the sale of the
CD-Insurance division. Although the gain on the sale created significant taxable
income for 1998, such gain was largely offset by utilizing our net operating
loss carryforwards.
 
COMPARISON OF RESULTS FOR THE YEARS ENDED DECEMBER 31, 1997 AND 1996
 
     Revenues.  Revenues remained at approximately the same level of $30.4
million for each of the years ended December 31, 1997 and 1996. Web-based
product revenues increased to $3.3 million for the year ended December 31, 1997
from $15,000 for the year ended December 31, 1996 due to the addition of new
customers. At the same time, CD Rom product revenues decreased by 11% to $27.1
million in 1997 from $30.4 million in 1996 as we began our transition to
Web-based products.
 
     Cost of Revenues.  Total cost of revenues increased 2% to $12.8 million for
the year ended December 31, 1997 from $12.5 million for the year ended December
31, 1996. As a percentage of total revenues, total cost of revenues increased
marginally to 42% in 1997 from 41% in 1996. This increase in total cost of
revenues was due principally to increased royalty expense for our
 
                                       31
<PAGE>   33
 
Web-based products. It was partially offset by a decrease in our costs of
revenues relating to the CD Rom product line.
 
     Cost of Web-based product revenues increased to $2.4 million for the year
ended December 31, 1997 from $0.3 million for the year ended December 31, 1996
due to a substantial increase in Web-based customers and related royalty
expenses. Cost of CD Rom product revenues decreased 15% to $10.4 million for the
year ended December 31, 1997 from $12.2 million for the year ended December 31,
1996. This decrease reflected our shift away from the CD Rom product line. As a
percentage of CD Rom product revenues, cost of CD Rom product revenues decreased
to 39% in 1997 from 40% in 1996.
 
     Selling and Marketing Expense.  Selling and marketing expense increased 7%
to $9.2 million for the year ended December 31, 1997 from $8.6 million for the
year ended December 31, 1996 principally due to increased headcount and related
expenses. Total selling and marketing expense increased as a percentage of total
revenues to 30% in 1997 from 28% in 1996.
 
     Platform and Product Development Expense.  Platform and product development
expense decreased 12% to $6.4 million for the year ended December 31, 1997 from
$7.3 million for the year ended December 31, 1996 principally due to the
decrease in headcount and related expenses, as well as lower contractor expense.
The reduction in headcount was exclusively in the platform development
organization as we ceased all development efforts related to the CD Rom platform
in 1997 and shifted all resources to Web-based platform and product development.
Platform and product development expense decreased as a percentage of total
revenues to 21% in 1997 from 24% in 1996.
 
     General and Administrative Expense.  General and administrative expense
decreased 7% to $3.4 million for the year ended December 31, 1997 from $3.7
million for the year ended December 31, 1996 principally due to the decrease in
amortization expense of intangibles. The amortization of $9.9 million of
intangibles, originally recorded in 1993 at the time of the management buy-out
of OneSource from Lotus, ended in 1997 with expense of $25,000 compared to $0.7
million in 1996. Increased salary and related expense, resulting from increased
headcount for infrastructure required to meet demands in management information
systems, contracting and UK finance management, partially offset the decrease in
amortization. General and administrative expense decreased as a percentage of
total revenues to 11% in 1997 from 12% in 1996.
 
     Interest Expense, Net.  Interest expense, net of interest income, increased
27% to $0.9 million for the year ended December 31, 1997 from $0.7 million for
the year ended December 31, 1996 due to increased borrowings for working capital
requirements in 1997.
 
     Gain on Sale of Product Line.  In June 1997, we sold our CD-Banking product
line for $0.7 million. As a result of the sale, we recorded a gain of $0.5
million which is net of transaction related expenses.
 
                                       32
<PAGE>   34
 
QUARTERLY RESULTS OF OPERATIONS AND OTHER DATA
 
   
     The following tables set forth a summary of OneSource's unaudited quarterly
operating results for each of the eight quarters in the two-year period ended
March 31, 1999. This information has been derived from unaudited interim
consolidated financial statements that, in the opinion of management, have been
prepared on a basis consistent with the Consolidated Financial Statements
appearing elsewhere in this prospectus and include all adjustments, consisting
of only normal recurring adjustments, necessary for a fair statement of such
information when read in conjunction with OneSource's Consolidated Financial
Statements and Notes thereto. Our operating results and other data for any
quarter are not necessarily indicative of results for any future period.
    
 
   
<TABLE>
<CAPTION>
                                                                          QUARTER ENDED
                                     ---------------------------------------------------------------------------------------
                                                  1997                                    1998                        1999
                                     -------------------------------   ------------------------------------------   --------
                                     JUNE 30,   SEPT. 30,   DEC. 31,   MAR. 31,   JUNE 30,   SEPT. 30,   DEC. 31,   MAR. 31,
                                     --------   ---------   --------   --------   --------   ---------   --------   --------
                                                                         (IN THOUSANDS)
<S>                                  <C>        <C>         <C>        <C>        <C>        <C>         <C>        <C>
STATEMENT OF OPERATIONS DATA (UNAUDITED):
Revenues:
  Web-based product................   $  369     $  979      $1,792    $ 2,628    $ 3,419     $ 4,479    $ 5,532    $ 6,903
  CD Rom product...................    7,383      6,309       6,032      5,322      4,273       2,725      2,050      1,240
                                      ------     ------      ------    -------    -------     -------    -------    -------
Total revenues.....................    7,752      7,288       7,824      7,950      7,692       7,204      7,582      8,143
                                      ------     ------      ------    -------    -------     -------    -------    -------
Cost of revenues:
  Web-based product................      451        718         892      1,287      1,872       2,070      2,634      2,970
  CD Rom product...................    2,747      2,523       2,405      1,979      1,643       1,159      1,011        487
                                      ------     ------      ------    -------    -------     -------    -------    -------
Total cost of revenues.............    3,198      3,241       3,297      3,266      3,515       3,229      3,645      3,457
                                      ------     ------      ------    -------    -------     -------    -------    -------
Gross profit.......................    4,554      4,047       4,527      4,684      4,177       3,975      3,937      4,686
                                      ------     ------      ------    -------    -------     -------    -------    -------
Operating expenses:
  Selling and marketing............    2,195      2,346       2,458      2,797      2,904       2,861      3,015      2,927
  Platform and product
    development....................    1,745      1,608       1,478      1,561      1,528       1,638      1,586      1,718
  General and administrative.......      749        686       1,037        957      1,051         897        942        860
                                      ------     ------      ------    -------    -------     -------    -------    -------
    Total operating expenses.......    4,689      4,640       4,973      5,315      5,483       5,396      5,543      5,505
                                      ------     ------      ------    -------    -------     -------    -------    -------
Loss from operations...............   $ (135)    $ (593)     $ (446)   $  (631)   $(1,306)    $(1,421)   $(1,606)   $  (819)
                                      ======     ======      ======    =======    =======     =======    =======    =======
 
                                                                 (PERCENTAGE OF TOTAL REVENUES)
Revenues:
  Web-based product................        5%        13%         23%        33%        44%         62%        73%        85%
  CD Rom product...................       95         87          77         67         56          38         27         15
                                      ------     ------      ------    -------    -------     -------    -------    -------
Total revenues.....................      100        100         100        100        100         100        100        100
                                      ------     ------      ------    -------    -------     -------    -------    -------
Cost of revenues:
  Web-based product................        6         10          11         16         24          29         35         36
  CD Rom product...................       35         35          31         25         22          16         13          6
                                      ------     ------      ------    -------    -------     -------    -------    -------
Total cost of revenues.............       41         45          42         41         46          45         48         42
                                      ------     ------      ------    -------    -------     -------    -------    -------
Gross profit.......................       59         55          58         59         54          55         52         58
                                      ------     ------      ------    -------    -------     -------    -------    -------
Operating expenses:
  Selling and marketing............       28         32          32         35         38          40         40         36
  Platform and product
    development....................       23         22          19         20         20          23         21         21
  General and administrative.......       10          9          13         12         13          12         12         11
                                      ------     ------      ------    -------    -------     -------    -------    -------
    Total operating expenses.......       61         63          64         67         71          75         73         68
                                      ------     ------      ------    -------    -------     -------    -------    -------
Loss from operations...............       (2)%       (8)%        (6)%       (8)%      (17)%       (20)%      (21)%      (10)%
                                      ======     ======      ======    =======    =======     =======    =======    =======
 
OTHER DATA FOR WEB-BASED PRODUCTS
  (AS OF THE QUARTER END)
  (UNAUDITED):                                           (IN THOUSANDS, EXCEPT NUMBER OF CUSTOMERS DATA)
Annualized contract value..........   $2,430     $4,815      $8,973    $11,854    $14,619     $19,754    $25,920    $28,338
Number of customers................       92        149         233        279        322         386        445        460
Average annualized contract value
  per customer.....................   $ 26.4     $ 32.3      $ 38.5    $  42.5    $  45.4     $  51.2    $  58.2    $  61.6
</TABLE>
    
 
                                       33
<PAGE>   35
 
   
     Annualized contract value represents the invoiced fees for one month for
all customer contracts for Web-based products in effect at the measurement date,
multiplied by 12, without regard to the actual duration of such contracts. At
June 30, September 30 and December 31, 1997 and March 31, June 30, September 30
and December 31, 1998 and March 31, 1999, annualized contract value was
calculated by multiplying the total amount of fees invoiced for one month and
included in deferred revenues for all customer contracts for Web-based products
at June 30, September 30 and December 31, 1997 and March 31, June 30, September
30 and December 31, 1998 and March 31, 1999 of $202,500, $401,250 and $747,750
and $987,850, $1,218,250, $1,646,200 and $2,160,000 and $2,361,500,
respectively, by 12.
    
 
     Our quarterly revenues, gross profits and results of operations have
fluctuated significantly in the past and we expect them to continue to fluctuate
significantly in the future. In addition, we believe that an important measure
of our business is the annualized contract value at the end of each period,
which also may fluctuate. Causes of such fluctuations have included and may
include, among other factors:
 
        - changes in demand for our products
 
        - the dollar value and timing of both new and renewal subscriptions
 
        - competition (particularly price competition)
 
   
        - increases in selling and marketing expenses, as well as other
          operating expenses
    
 
        - technical difficulties or system downtime affecting our products on
          the Web generally
 
        - economic conditions specific to the Web, as well as general economic
          conditions
 
        - consolidation of our customers
 
   
In addition, a substantial portion of our expenses, including certain product
development and selling and marketing expenses, must be incurred in advance of
revenue generation. If our projected revenue does not meet our expectations,
then we are likely to experience an even larger shortfall in our operating
profit (loss) relative to our expectations.
    
 
   
     Annualized contract value depends upon the timely renewal or upgrade of
existing customers and the sale to new customers of subscription agreements
within a quarter and can be difficult to forecast accurately. In addition, we
have experienced some quarterly seasonality in contract bookings with a
significant amount of activity occurring in the fourth quarter of a given year.
Accordingly, these timing variations can create shortfalls in revenues in
relation to our expectations and have an adverse effect on our operating
results.
    
 
LIQUIDITY AND CAPITAL RESOURCES
 
     Since acquiring our business from Lotus in 1993, we have funded our
operations through a combination of seller financing, proceeds received from the
sale of Class P common stock and common stock in connection with the purchase of
the business from Lotus, bank debt, proceeds received from the sale of
non-strategic lines of business, capitalized equipment leases and cash flows
from operations.
 
   
     Our cash and cash equivalents totaled $6.7 million at March 31, 1999, as
compared to $0.4 million at March 31, 1998, an increase of $6.3 million. Net
cash of $1.2 million was provided by operations for the year ended December 31,
1998, primarily resulting from growth in contracts
    
 
                                       34
<PAGE>   36
 
   
invoiced for the period. Net cash of $1.0 million was used in operations in the
quarter ended March 31, 1999.
    
 
   
     Net cash provided by investing activities for 1998 was $9.0 million,
primarily reflecting net cash proceeds from the sale of the CD-Insurance
division, offset partially by expenditures of $1.3 million for property and
equipment. Net cash used in investing activities for the quarter ended March 31,
1999 was $0.8 million. Net cash used in financing activities for the year ended
December 31, 1998 was $2.0 million reflecting primarily repayments on our line
of credit, term loan and capital lease obligations. Net cash used by financing
activities for the quarter ended March 31, 1999 was $0.1 million.
    
 
     We do not currently have a line of credit but intend to enter into a
revolving line of credit for letters of credit and general working capital.
 
   
     We have a note outstanding to Lotus and the principal amount outstanding at
December 31, 1998 was $6.2 million. This note plus accrued interest is due
September 8, 2000 and a repayment of a portion of the note would be required
upon completion of this offering. We intend to repay the note upon the
completion of this offering. Upon repayment of the note, OneSource will
recognize a one-time expense of approximately $0.3 million relating to the
unamortized portion of the original issue discount.
    
 
     We currently anticipate capital expenditures of approximately $2.8 million
for 1999, including approximately $0.9 million in connection with the relocation
of our corporate headquarters, which is scheduled to occur in June 1999.
 
     We expect to investigate the possibility of investing in or acquiring
complementary businesses, products or technologies, although we have not entered
into any commitments or negotiations with respect to any such transactions.
 
     We believe that our net proceeds from this offering, together with our
current cash and cash equivalents and funds anticipated to be generated from
operations, will be sufficient to satisfy working capital and capital
expenditure requirements for at least the next twelve months.
 
YEAR 2000 READINESS DISCLOSURE STATEMENT
 
     We have established a Year 2000 compliance program and we anticipate that
our products and internal systems should operate correctly at the turn of the
century. We have been performing Year 2000 tests for the past three years.
Initial Year 2000 work was organized in late 1996 to certify readiness of the
proprietary client software associated with our CD Rom product line. A more
formal organizational effort involving senior management, product managers,
developers and quality assurance personnel was established in early 1998.
 
     Compliance Program.  The scope of OneSource's compliance program focuses on
four key areas: products, third-party information providers, third-party
software applications and internal systems. Our compliance program involves a
three-step process to evaluate each of the key areas, which includes
 
   
     - inventory review,
    
 
   
     - assessment/testing and
    
 
   
     - resolution and contingency planning.
    
 
                                       35
<PAGE>   37
 
   
     Products.  We have assessed existing products to review OneSource's overall
compliance status. We have decided not to test those products that will be
discontinued prior to December 31, 1999. This includes, for example, all
products associated with our CD Rom product line with the exception of the "UK
Companies" product, which we expect to produce beyond 1999. We have established
clear migration paths for those customers who have products installed that will
be discontinued. As of February 1999, we had completed almost all work
associated with creating internal company awareness of Year 2000 issues,
organizing and executing high-level plans to address the concern, and
inventorying existing systems, data, and software dependency for Year 2000
exposure. We estimate that as of March 1999 we had completed about 90% of the
process of analyzing the impact of Year 2000 issues company-wide and developing
detailed plans for resolving problem situations. We are in the midst of
implementing those plans. Resolution of outstanding Year 2000 issues for
non-Information Services applications are being incorporated with plans to move
our corporate offices in June 1999. Projects that involve IS-related issues,
particularly those processes that prepare and deliver data in our products, are
expected to be completed in May 1999, with follow-up testing, if required,
extending through August 1999. In terms of verifying and planning for Year 2000
compliance for our products, we use the British Standards Institute's definition
of Year 2000 compliance as stated in DISC PD2000-1:1998: A Definition of Year
2000 Conformity Requirements. According to this definition, Year 2000 conformity
means that neither performance nor functionality is affected by dates prior to,
during and after the year 2000, and according to the following rules:
    
 
        - No value for current date will cause any interruption in operation
 
        - Date-based functionality must behave consistently for dates prior to,
          during and after the year 2000
 
        - In all interfaces and data storage, the century in any date must be
          specified either explicitly or by unambiguous algorithms or
          inferencing rules
 
        - Year 2000 must be recognized as a leap year
 
     New products under development for this year and next have Year 2000
qualification as part of their standard test plans. Products that fail their
standard test plans are not released to customers.
 
   
     Third-Party Information Providers.  OneSource relies on content provided by
third-party information providers. Communication with our information providers
with respect to their Year 2000 compliance status was largely complete as of
February 1999. OneSource's goal is to have all information providers' compliance
responses complete by May 31, 1999. We are also trying to minimize our
dependence on third-party information providers' external date formats by
accommodating changes in date format within our existing production processes.
    
 
   
     Third-Party Application and System Software.  OneSource invests in
third-party software as components of the data storage and delivery requirements
of our products. We have identified an exhaustive list of such systems along
with research of the current status of their Year 2000 compliance efforts. We
completed this research in February 1999. Confirmation of compliance or a
specific plan to replace any non-compliant resource was completed in March 1999.
Only a short list of these resources remains non-compliant as of April 1999.
While OneSource is committed to taking every reasonable action to obtain
assurances from such business partners that their software is Year 2000
compliant, we cannot guarantee the performance of such
    
 
                                       36
<PAGE>   38
 
business partners or predict whether any of the assurances provided by them may
be accurate or realistic.
 
   
     Internal Systems.  OneSource has completed its inventory of its internal
systems and its assessment of such systems' compliance status is approximately
90% complete, with an anticipated completion date of May 31, 1999. The scope of
these systems ranges from accounting, payroll, communications, network hardware
and applications, Internet access, internal information systems and data
production systems. The majority of our internal systems and equipment are
currently Year 2000 compliant. Some existing Year 2000 issues, including
OneSource's phone switch and some components of the Corporate Local Area
Network, will be addressed as part of the relocation of our offices in June
1999.
    
 
   
     Costs.  To date we have not relied on outside consulting expertise for
assessing our products or testing for Year 2000 related issues. We are utilizing
internal personnel to identify Year 2000 readiness in our supported products,
network hardware/applications, internal business and information systems. A
large number of our personnel are necessarily involved in this work. We estimate
that the aggregation of all such efforts represents an equivalent of six
full-time employees. Not included in this estimate are those indirect costs
associated with time spent by management or staff discussing Year 2000 issues
internally or with third parties. Such discussions are handled by existing
employees in the ordinary course of business. We have not identified the need to
hire additional staff specifically to address third-party questions or concerns.
    
 
     Risks.  With regard to third-party information suppliers, OneSource is
addressing, through normal operating procedures any concerns that third-party
information providers may have delivery problems associated with Year 2000
issues. OneSource is identifying issues by internal quality assurance or
editorial reviewers. When identified, issues are being handled by contacting the
information provider who may correct the problem at the source or by developing
a workaround in the software. The risks associated with delivery problems
present more serious issues for us as our products could be deprived of certain
data content.
 
     While OneSource does not anticipate a failure in its ability to deliver
data, and has established contingency plans as discussed below, such a failure
may
 
   
     - have a material adverse effect upon our business, financial condition and
       results of operations
    
 
   
     - require us to incur unanticipated material expenses to remedy any problem
    
 
   
     - result in litigation due to our inability to fulfill our contractual
       obligations
    
 
   
In such cases, we would likely suffer a disruption in our revenue stream and
operations could be materially impacted.
    
 
   
     Contingency Plans.  At this time, our contingency plans relating to the
above discussed Year 2000 issues include having additional support staff and
programmers on call for rapid response dealing with any disruption of our
business during a critical date transition, for example January 1, 2000 or
February 29, 2000. Our assessment of our products and internal systems for Year
2000 compliance will be an ongoing effort throughout the remainder of this year.
The information contained herein is the product of conclusions made from the
information and test results available to OneSource at this time.
    
 
                                       37
<PAGE>   39
 
RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS
 
     In March 1998, the Accounting Standards Executive Committee ("AcSEC")
issued Statement of Position ("SOP") 98-1, "Accounting for the Costs of Computer
Software Developed or Obtained for Internal Use." SOP 98-1 establishes the
accounting for costs of software products developed or purchased for internal
use, including when such costs should be capitalized. We do not expect SOP 98-1,
which is effective for OneSource beginning January 1, 1999, to have a material
effect on our financial condition or results of operations.
 
     In April 1998, the AcSEC issued SOP 98-5, "Reporting on the Costs of
Start-Up Activities." Start-up activities are defined broadly as those one-time
activities relating to opening a new facility, introducing a new product or
service, conducting business in a new territory, conducting business with a new
class of customer, commencing some new operation or organizing a new entity.
Under SOP 98-5, the cost of start-up activities should be expensed as incurred.
SOP 98-5 is effective for OneSource's calendar year 1999 financial statements
and we do not expect its adoption to have a material effect on our financial
condition or results of operations.
 
     In June 1998, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards ("SFAS") No. 133, "Accounting for Derivative
Instruments and Hedging Activities." The new standard establishes accounting and
reporting standards for derivative instruments, including certain derivative
instruments embedded in other contracts, and for hedging activities. SFAS No.
133 is effective for all fiscal quarters of fiscal years beginning after June
15, 1999. We do not expect SFAS No. 133 to have a material effect on our
financial condition or results of operations.
 
                                       38
<PAGE>   40
 
                                    BUSINESS
 
   
     This prospectus contains forward-looking statements that involve
substantial risks and uncertainties. Our actual results, performance or
achievements could differ materially from the results expressed in or implied by
these forward-looking statements. Factors that could cause or contribute to
these differences include those discussed in "Risk Factors."
    
 
OVERVIEW
 
     OneSource provides Web-based business and financial information to
professionals who need quick access to reliable corporate, industry and market
intelligence. Our Business Browser product line integrates comprehensive and
up-to-date business and financial information on over one million public and
private companies from more than 25 information providers drawing upon over
2,500 sources of content. These sources include both textual information, such
as news, trade press, SEC filings, executive biographies and analyst reports,
and numeric information, such as company financial results, stock quotes and
industry statistics. Our customers access this information over the Internet
using standard Web browsers at a fixed annual subscription price.
 
     Our products are designed to address information needs of leading
professional and financial services firms, technology companies and other large
organizations. Representative customers include American Express, Bain &
Company, BankAmerica, Boeing, British Telecom, Deloitte & Touche, Ernst & Young,
Harvard Business School, KPMG Peat Marwick, MCI/Worldcom, Merrill Lynch, Oracle
and SAP.
 
   
     At March 31, 1999, 460 organizations subscribed to our Web-based Business
Browser product line, up from 279 at March 31, 1998. On average, our customers
for Web-based products at March 31, 1999 had an annualized contract value of
$61,604 per customer, compared to $42,489 per customer at March 31, 1998. The
annualized value of Business Browser customer contracts was $25.9 million at
December 31, 1998, having grown from $9.0 million at the end of 1997. Of this
$25.9 million, $14.2 million was attributable to those customers that were under
contract at both December 31, 1997 and 1998. The renewal rate of the Business
Browser product line for 1998 was 90% calculated on a dollar basis.
    
 
INDUSTRY BACKGROUND
 
   
     According to Simba, the market for all Web-based and on-line business
information services was nearly $24.8 billion in 1997 and is projected to grow
to almost $39.8 billion in 2002. This reflects a compound annual growth rate of
9.9%. Simba also reported that the primary market segment in which OneSource
participates--Web-based and on-line financial news, current awareness and
research services--was $5.4 billion in 1997 and is projected to grow to $9.8
billion in 2002. This reflects a compound annual growth rate of 12.6%.
    
 
     Recent industry growth has been driven by corporations and other
enterprises recognizing that productivity and competitiveness depend on
extensive knowledge of external information, including information about
industries, customers, competitors, prospects, business trends, breaking news
and market data. These organizations have already invested heavily in Internet
connectivity and networked computing infrastructures to manage internal
information and are seeking to leverage these infrastructures to access and
manage external information.
 
                                       39
<PAGE>   41
 
     The task of finding and using external information is often difficult and
cumbersome. Traditional, textual sources such as newspapers and directories
require hours to search. A centralized library can be costly to establish and
maintain and can be an inefficient and incomplete information source. While the
emergence of the Web has greatly increased access to information, finding
comprehensive, precise, up-to-date, relevant and reliable information on the Web
can still be time-consuming and difficult. While other on-line services can be
useful research tools in certain circumstances, most of these services currently
focus on specific areas of content, such as financial data or news. They do not
provide the full range of data required by professionals. In addition, most
on-line services charge a fee for each search performed.
 
     Traditional sources, the Web and existing on-line services do not
adequately meet the information needs of many professionals who want to compete
effectively in today's fast-paced, global, customer-focused marketplace. These
professionals and their organizations demand external information that is:
 
        - easily accessible in a user-friendly format
 
        - comprehensive and includes both textual and numeric information
 
        - derived from multiple, high quality sources
 
        - integrated at a single site
 
        - delivered on a platform that allows interpretation, manipulation and
          analysis
 
        - available throughout the enterprise at a fixed cost
 
        - delivered in a product easily implemented and supported on a corporate
          network
 
THE ONESOURCE SOLUTION
 
     OneSource's Business Browser product line is designed to be a comprehensive
and easy to use business and financial information resource for professionals
who need quick access to reliable corporate, industry and market intelligence.
 
     Business Browser products integrate over 2,500 sources of business
information from more than 25 category-leading business and financial
information providers. These sources include both textual information, such as
news, trade press, SEC filings, executive biographies and analyst reports, and
numeric information, such as company financial results, stock quotes and
industry statistics. OneSource uses its proprietary KeyID technology to sort,
prioritize, integrate and link information on over one million public and
private companies worldwide.
 
     Our Business Browser product line is accessed through a standard Web
browser that is already available and familiar to end-users. Because our
products are based on standard Web technology, our customers require minimal
installation and systems support and users have full access to the products at
any time from anywhere via the Internet.
 
     OneSource focuses on the functional uses of the business and financial
information it delivers. The Business Browser product line has been designed for
use not only by traditional users of business information, but also throughout
an organization, including sales, marketing, finance and management
professionals. We apply our knowledge of how business professionals use
information to transform raw, disparate data into meaningful, actionable
information. We focus on integrating and presenting information so that
interpretation, manipulation and analysis
 
                                       40
<PAGE>   42
 
can be performed more easily by the end user. Because the interface is built
around the inquiries of professionals, users require minimal training to become
productive quickly.
 
     OneSource's pricing strategy is designed to be particularly attractive to
large organizations. The Business Browser product line is available at a fixed
annual subscription price which declines on a per-user basis as the total number
of users increases for that customer. The fixed-price model encourages
professionals to use the products as needed without concern with additional
charges, and a declining marginal price per user encourages customers to
distribute our products widely throughout their organizations.
 
STRATEGY
 
     Our goal is to become a leading Web-based provider of business and
financial information to professionals worldwide. To accomplish that goal, we
have adopted the following strategies:
 
     --Focus on Information Needs of Professionals in Large Organizations.  We
believe that professional and financial services firms, technology companies and
other large organizations have the widely distributed Web access necessary to
take advantage of the Business Browser product line and are most likely to be
willing to purchase external information services to gain the competitive
advantages available through our products. While many alternative products are
focused on small organizations and individual consumers, our product and pricing
strategies and sales and marketing efforts have been designed to address the
needs of large enterprises.
 
   
     --Expand Customer Base.  At March 31, 1999, 460 organizations subscribed to
our Web-based Business Browser product line, up from 279 at March 31, 1998. One
group of our direct sales force, our account executives, concentrates primarily
on selling the Business Browser product line to new customers. We intend to
continue to invest in training our sales force and in recruiting technically
qualified sales personnel to sell Business Browser products. In addition, while
the traditional users of on-line business information services have been
primarily financial analysts and professional service providers, we have
expanded our target customer base to include corporations which are purchasing
our products for use by their sales, marketing, finance and management
professionals. We also intend to explore selective third-party distribution of
our products primarily to expand geographic coverage. For example, we recently
entered into an agreement with Dun & Bradstreet under which they will serve as a
distributor of our European Business Browser product.
    
 
     --Leverage Existing Customer Base.  We will continue to seek to increase
sales to existing customers by expanding the number of authorized user seats at
each customer and by upgrading customers to new products, more extensive content
and increased functionality. Each customer is assigned an account manager who is
responsible for that customer's retention, monitoring that customer's needs and
assisting that customer with rollouts and upgrades. The average annualized
contract value at December 31, 1998 of Business Browser customers who were also
customers at December 31, 1997 was $76,143 per customer, compared to $38,512 per
customer at December 31, 1997, an increase of 98% during the course of the year.
 
     --Expand Content and Product Offerings.  Since introducing Business Browser
in December 1996, we have followed a strategy of enhancing the Business Browser
product line by adding content from new sources, increasing functionality and
designing products tailored to particular markets. For example, in January 1999
we introduced European Business Browser, which includes content focused on the
European market, and in December 1998 we introduced
 
                                       41
<PAGE>   43
 
AppLink, which permits customers to integrate content from Business Browser
products within the customer's own intranet applications, such as sales force
automation applications.
 
   
     --Strategic Alliances and Possible Acquisitions.  We will seek to expand
our distribution channels in part by seeking strategic alliances with partners,
such as vendors of sales automation software, who may use AppLink to integrate
content from the Business Browser products into their software offerings. In
addition, OneSource may seek additional content sources, distribution channels
or technology through selective acquisitions or strategic alliances. While we
discuss potential acquisitions, investments and alliances from time to time, we
currently have no commitments or arrangements regarding any potential
acquisitions, investments or alliances.
    
 
PRODUCTS
 
  Business Browser Product Line
 
     The Business Browser product line includes:
 
     US BUSINESS BROWSER.  Released in December 1996, US Business Browser is
focused specifically on the US and Canada. It contains a subset of business and
financial information from the Global Business Browser product. It covers over
250,000 public and private companies in the US and Canada.
 
     UK BUSINESS BROWSER.  Released in September 1997, UK Business Browser is a
comprehensive source of information on over 350,000 public and private companies
in the UK.
 
     GLOBAL BUSINESS BROWSER.  Released in December 1997, Global Business
Browser is a single, integrated resource that provides information on over
350,000 public and private companies from around the world.
 
     EUROPEAN BUSINESS BROWSER.  Released in January 1999, European Business
Browser provides users with a comprehensive database on 300,000 public and
private companies across Europe, including 50,000 UK companies. An important
source of data for the European Business Browser is Dun & Bradstreet, a leading
business information source.
 
     Business Browser delivers information in an integrated format. This allows
customers to obtain different types of information from multiple sources in a
single report. Business Browser products organize data around business
applications and transform raw, disparate data into meaningful, actionable
information, delivered according to the characteristics users have defined and
in the custom formats, tables and reports that users require. Users who need to
perform detailed analysis can also easily transfer quantitative data into
spreadsheets or other desktop tools, such as contact management software.
 
     Specific applications available through the Business Browser product line
include:
 
        - "Company Profiler" delivers integrated reports on a company's history,
          products, competition, industry, executives, current news articles and
          financials. Both summary and detailed company reports are available,
          depending on the user's need. In addition, "Corporate Family Reports"
          allow users to quickly map relationships among subsidiaries and
          divisions of corporations.
 
        - "WatchList Update" automatically keeps track of new articles, news
          stories, financial filings and research reports on the companies the
          user monitors.
 
                                       42
<PAGE>   44
 
        - "Industry Profiler" delivers reports on market size, segmentation,
          financial norms, ratios and forecasts for a specified industry, as
          well as participants, industry news and analysis, and creates research
          reports with graphs and statistics that help track industry trends.
 
        - "Company Finder" screens companies by defining key search
          characteristics to deliver a targeted list by industry, geography,
          size, revenues, employment or other key characteristics.
 
        - "Topic Search" screens news stories, research reports, business
          descriptions and trade articles for information by topic.
 
        - "Executive Search" provides users with reports on business leaders by
          name, company, location, schools and affiliated organizations.
 
  Additional Software Applications
 
     Two additional software applications are available with Business Browser
products.
 
     BUSINESS BROWSER AP.  Business Browser AP, which became commercially
available in August 1997, is an advanced Web-based quantitative analysis tool
available as an option with all of the Business Browser products other than
European Business Browser. Business Browser AP lets users screen across a wide
range of public company financial statement items, ratios, growth rates and
other criteria. It also allows users to produce detailed quantitative reports of
their own design. Business Browser AP also makes EDGAR documents more user
friendly by removing confusing computer codes, formatting tables for easy
viewing and printing, and allowing users to export tables to a spreadsheet.
 
   
     BUSINESS BROWSER APPLINK.  Business Browser AppLink, which became
commercially available in December 1998, is a software toolkit that allows
customers to easily incorporate Business Browser content, like company profiles,
news, business and trade articles, analyst reports, executive biographies,
industry intelligence and financial data, directly into corporate intranet
applications. Users have the ability to integrate in-depth, objective external
business information into their existing internal applications such as prospect
and customer databases, sales force automation tools, enterprise reporting
software and corporate Web applications. No special client software or dedicated
servers are necessary. AppLink-enabled applications are currently under
development at a number of client sites.
    
 
  Legacy CD Rom Products
 
     Prior to our introduction of Business Browser in 1996, we distributed
business information on CD Rom. Having made the strategic decision to transition
to a completely Web-based business, we began in 1998 to phase out our CD Rom
products. We expect that all but two of these products will be completely phased
out by the end of 1999, with the remaining two products being phased out shortly
thereafter.
 
PLATFORM AND PRODUCT DEVELOPMENT
 
   
     The product development function is currently carried out by 39 employees
in our Global Strategic Web Applications Team. This team includes product
managers who define functional software components, end user interfaces, report
formats and content requirements; product development engineers who take content
feeds from information partners and write database
    
 
                                       43
<PAGE>   45
 
loader code; and the KeyID team whose role, through both programming and
editorial expertise, is to ensure consistent integration and presentation of
information from multiple underlying sources of content.
 
     Our product development strategy is to deliver a broad range of information
on a software platform which allows end users to efficiently research their
business questions. Since the inception of the Business Browser product line, we
have consistently added sources of content and improved the software
functionality for users. In the future, we expect to continue to make these
types of improvements to our product line.
 
     The product development team uses our proprietary KeyID technology to
integrate and link public and private companies worldwide from multiple
databases, each with its own set of incompatible identifiers. Through a
combination of proprietary programmatic and editorial means, this technology
enables us to provide a single and unified presentation from multiple underlying
company databases. It also manages multiple SIC codes and industry mappings
assigned to companies by disparate databases and reclassifies the companies to
comparable categories. The system also keeps track of company name synonyms to
allow searching by commonly used alternative company names. The synonyms feature
allows the user to input one company name or term and to access all information
for that company although it may be categorized under different names or terms
depending on the database. In total, the KeyID database contains 1.1 million
companies, 1.7 million synonyms and 40,000 URLS.
 
                                       44
<PAGE>   46
 
INFORMATION PROVIDERS
 
     Each Business Browser product combines an array of carefully chosen
financial, company, industry, executive and news-related content obtained from
leading business and financial information providers identified by our Global
Strategic Web Applications Team. The following table lists the type of content
provided by our current information providers and which Business Browser
products include that content.
 
<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------
                                                                   BUSINESS BROWSER PRODUCT
                                                                  ---------------------------
      TYPE OF INFORMATION             INFORMATION PROVIDER        GLOBAL   US    UK     EURO
- ---------------------------------------------------------------------------------------------
<S>                              <C>                              <C>      <C>   <C>   <C>
 Company Information...........  CorpTech                           X       X
                                 Dun & Bradstreet                                        X
                                 Extel (Primark)                    X
                                 Graham & Whiteside Limited         X
                                 Hemmington Scott                                 X
                                 Hoover's Inc.                      X       X
                                 ICC                                              X
                                 InfoUSA                            X       X
                                 Market Guide                       X       X
                                 Reed Elsevier                      X       X
                                 Worldscope (Disclosure Inc.)       X
 Industry Reports and Data.....  McGraw-Hill                        X       X
                                 Integra                            X       X
                                 The Gale Group                     X       X
                                 Snapshots Intl                     X       X     X      X
 News and Newsletters..........  Asia Pulse                         X       X     X      X
                                 Comtex News                        X       X     X      X
                                 Phillips Newsletters               X       X     X      X
                                 Reuters News                       X       X     X      X
 Business and Trade Press......  Responsive Database Services       X       X     X      X
                                 Information Access Company         X       X     X      X
 Executive Biographies.........  Marquis Who's Who                  X       X
                                 Standard & Poor's Register         X       X
 Stock Quotes..................  Datastream                                       X
                                 Quote.com                          X       X
 Investment Reports............  Investext                          X       X     X
 Published Statistical           Responsive Database Services       X       X
    Tables.....................
 SEC Filings...................  EDGAR                              X       X
- ---------------------------------------------------------------------------------------------
</TABLE>
 
   
     We enter into contracts with our information providers which are generally
for a term of at least one year, and which renew for the same period if not
canceled with advance notice. These contracts may be terminated under certain
circumstances. For more information, see "Risk Factors--If our information
providers stopped doing business with us, we could not continue to sell Business
Browser." Under these arrangements, royalties are generally paid on a quarterly
basis to information providers. Royalties are typically calculated either as a
flat percentage of our revenues or as a per-user fee that declines as the number
of authorized users of the product increases. In limited cases, we pay a fixed
fee per period for unlimited use of the information.
    
 
                                       45
<PAGE>   47
 
CUSTOMERS
 
   
     At March 31, 1999, 460 organizations had subscribed to our Web-based
Business Browser product line, up from 279 at March 31, 1998. On average, our
customers at March 31, 1999 had an annualized contract value of $61,604 per
customer, compared to $42,489 per customer at March 31, 1998. The annualized
contract value of customer contracts for Business Browser products was $25.9
million at December 31, 1998, having grown from $9.0 million at December 31,
1997. The following is a representative list of significant customers in each of
our primary industry sectors:
    
 
PROFESSIONAL SERVICES
Arthur Andersen
Arthur D. Little
Bain & Company
Cambridge Technology Partners
Deloitte & Touche
EDS
Ernst & Young
KPMG
Watson Wyatt
 
OTHER CORPORATIONS
Avery Dennison
Bayer
Boeing
   
British Telecom
    
Cargill
Coca Cola
General Electric
   
GTE
    
Johnson & Johnson
Pitney Bowes
Sears
FINANCIAL SERVICES
American Express
BankAmerica
   
BankBoston
    
   
Bank of Scotland
    
Bank of Tokyo
Bear Stearns
Credit Lyonnais
First Union Bank
Merrill Lynch
Oppenheimer
Royal Bank of Canada
 
BUSINESS SCHOOLS
Dartmouth
Duke
Harvard
Stanford
University of Florida
University of Southern California
University of Texas
Yale
TECHNOLOGY
AT&T
   
Compaq
    
   
Data General
    
JD Edwards
Lockheed Martin
MCI/Worldcom
Nortel
Oracle
PeopleSoft
   
Platinum Technology
    
SAP
Sun Microsystems
 
     At December 31, 1998, approximately 60% of our annualized contract value
for Web-based products came from customers in the professional services and
financial services sectors, which have been the traditional customers for
business information products. The remaining 40% of our annualized contract
value at December 31, 1998 for Web-based products represented customers in
sectors that have not historically been heavy consumers of business information
products. At these customers, Business Browser products are used by
professionals throughout the organization, including sales, marketing, finance
and management personnel, as a result of the products' ease of use and
availability over the Web.
 
SALES AND MARKETING
 
   
     We market our products through a direct sales force and marketing staff,
which as of March 31, 1999 consisted of 69 full-time employees based at five
locations throughout the US and one location in the UK. The sales function
breaks down into two major parts:
    
 
        - the initial sale, which is conducted by account executives
 
        - customer retention and growth through the sale of additional seats and
          upgrades, which are primarily handled by account managers
 
                                       46
<PAGE>   48
 
   
     As of March 31, 1999, we had 19 account executives and 15 account managers.
Compensation for account executives and account managers is comprised of base
salary plus commission. The commission component typically constitutes 50% and
40% of the compensation of account executives and account managers,
respectively. We also employ a telemarketing group which assists in generating
leads for the account executives. As of March 31, 1999, there were seven members
of the telemarketing group.
    
 
     Business Browser products are sold on a subscription basis, generally for a
one-year period. Customers typically prepay for annual subscriptions. Typically,
contracts automatically renew for the same period prior to expiration unless
canceled by the client. The Business Browser product line is available at a
fixed annual subscription price which declines on a per-user basis as the total
number of users increases. The fixed-price model encourages business
professionals to use the products as needed without concern with additional
charges, and a declining marginal price per user encourages customers to
distribute the products widely throughout their organizations. List prices as of
January 1, 1999 ranged from $20,000 per year for a single user seat to $290,000
per year for 1,000 user seats.
 
CUSTOMER SUPPORT
 
   
     We provide both on-site and telephone support for clients. As of March 31,
1999, we had eight field support consultants who provide assistance before and
after sales are completed. For example, they assist in managing free product
trials for prospective customers and expanding the availability of our products
to additional users through training and rollout initiatives within an
organization. They also provide technical consulting which may be requested,
such as the customization of Web pages for large clients or the building of
prototype applications using AppLink.
    
 
   
     As of March 31, 1999, we had six telephone-based customer support
representatives in the U.S. and one in the UK. These representatives operate the
telephone help desk which is open from 8:00 a.m. to 8:00 p.m. Monday through
Friday.
    
 
WEBSITE TECHNOLOGY AND OPERATIONS
 
     OneSource has designed its Website architecture to be open, flexible,
scaleable and reliable. The architecture is designed to accommodate an evolving
collection of third-party technologies that together provide the functionality
required by our products' applications. These technologies are adapted and
integrated with software developed in-house. As a result, we believe our systems
are flexible enough to upgrade or change software as new, improved third-party
software products are developed or as we develop our own new software.
 
     Our on-line architecture was also designed to be able to expand easily and
efficiently as usage grows. By treating the core backoffice technologies as
system "objects," we have constructed a natural environment for simply adding
additional copies of specific servers, as needed, to share the load. Besides
load sharing and usage expansion, this setup also provides natural failover
capabilities for the system. Any given server can suffer a problem and one or
several backups share the load while the problem is corrected.
 
     The OneSource on-line site is located at a dedicated hosting facility
managed by GTE/BBN Internetworking. It is a node on the GTE/BBN Internet
backbone. The system is available 24 hours a day, seven days a week. For more
information, see "Risk Factors--If our Website
 
                                       47
<PAGE>   49
 
   
service is disrupted, our customers could lose access to Business Browser and
our reputation could be harmed."
    
 
     The engineering team closely monitors the usage, delivery performance and
availability of the system. Particular attention is paid to individual product
usage, relative levels of customer activity, speed of data retrieval and
delivery, peak usage figures, uptime statistics and power requirements. This
engineering team is key to maintaining continuous service for our customers.
 
COMPETITION
 
   
     The business information services industry is intensely competitive. We
face direct or indirect competition from numerous companies as described in
"Risk Factors--Competition in our industry is intense and many of our
competitors have greater resources than we do; this competition may adversely
affect our financial results," "--Free information may lessen the demand for
Business Browser," and "--Increased competition could result in price
reductions, reduced gross margins and loss of market share."
    
 
     The principal competitive factors in our industry are availability of
comprehensive and integrated business and financial information, ease of use,
support and training required and price/performance characteristics. We believe
that Business Browser products are differentiated from the products offered by
other providers because of our ability to deliver information from many
different, competing providers on an enterprise-wide basis. We also believe that
our focus on integrating and presenting information so that interpretation,
manipulation and analysis can be performed more easily also differentiates our
products.
 
EMPLOYEES
 
   
     We had 168 full-time employees as of March 31, 1999, including 69 in sales
and marketing, 20 in engineering, 16 in production/on-line support, 24 in
finance and administration and 39 on our Global Strategic Web Applications Team.
Our employees are not represented by any collective bargaining organization. We
have never experienced a work stoppage and we believe our relationships with our
employees are good.
    
 
FACILITIES
 
   
     Our corporate headquarters are located in a 28,766 square foot rented
facility in Cambridge, Massachusetts, under a lease expiring in July 1999. We
have entered into a new lease for a new, 35,766 square foot headquarters
facility in Concord, Massachusetts. We intend to move to that facility in June
1999. Our lease to the new facility expires in May 2004. We lease additional
sales offices in Chicago, New York, San Francisco and London, England. We
believe that these facilities and additional or alternative space available to
us will be adequate to meet our needs for the foreseeable future.
    
 
LITIGATION
 
     OneSource is not a party to any material legal proceedings.
 
                                       48
<PAGE>   50
 
                                   MANAGEMENT
 
EXECUTIVE OFFICERS AND DIRECTORS
 
   
     The following table sets forth information with respect to the executive
officers and directors of OneSource as of March 31, 1999.
    
 
<TABLE>
<CAPTION>
NAME                          AGE                          POSITION
- ----                          ---                          --------
<S>                           <C>   <C>
Martin Kahn(1)(2)...........  48    Chairman of the Board of Directors
Daniel J. Schimmel..........  39    President, Chief Executive Officer and Director
James A. Becker.............  41    Vice President, Global Strategic Web Applications Team
Philip J. Garlick...........  37    Vice President, Global Enterprise Sales and Marketing
Mark C. VanDine.............  42    Vice President, Engineering
Roy D. Landon...............  43    Vice President, Finance and Administration
David Dominik(1)............  42    Director
Gregg S. Newmark(2).........  40    Director
</TABLE>
 
- ------------
   
(1) Member of compensation committee.
    
 
   
(2) Member of audit committee.
    
 
   
     Martin Kahn joined OneSource as Chairman of the board of directors in
September 1993. Mr. Kahn has served as managing director of Cadence Information
Associates LLC since 1996. Mr. Kahn was the chairman of Ovid Technologies, Inc.,
a producer of medical, scientific and technical CD Rom and network products,
from 1990 to 1998, was chairman of VISTA Information Solutions, Inc., a supplier
of information about geographically-based risk, from 1992 to 1996 and was
chairman of Shoppers Express, Inc., an Internet-based grocery shopping service,
from 1995 to 1998. Mr. Kahn holds an MBA from the Harvard Business School and a
B.A. from Yale University.
    
 
     Daniel J. Schimmel joined OneSource as President, Chief Executive Officer
and a Director in 1993. Prior to joining OneSource, Mr. Schimmel served as
general manager of the OneSource Division and held other operating positions at
Lotus. Mr. Schimmel holds an MBA from the Harvard Business School and a B.A.
from Harvard University.
 
     James A. Becker joined OneSource as the Director of Product Management in
1993 and became Vice President, Global Strategic Web Applications Team in 1995.
Prior to joining OneSource, Mr. Becker served as group product manager at Lotus.
Mr. Becker holds an MBA from the Yale School of Management and a B.A. from Brown
University.
 
     Philip J. Garlick joined OneSource as Director of Marketing and Product
Development in 1993, served as Vice President and General Manager Europe from
1995 to October 1997, and in October 1997 became Vice President, Global
Enterprise Sales and Marketing. Prior to joining OneSource, Mr. Garlick was a
marketing executive at Lotus UK. Mr. Garlick holds an MA in Economics and a B.A.
from Manchester University.
 
     Mark C. VanDine joined OneSource as Senior Product Manager in 1993, served
as Director, Platform Product Management in 1995 and in 1996 became Vice
President, Engineering. Prior to joining OneSource, Mr. VanDine was a senior
consultant at Lotus. Mr. VanDine holds a B.A. and an MBA from Penn State
University.
 
                                       49
<PAGE>   51
 
     Roy D. Landon joined OneSource as Director, Finance and Administration in
1993 and became Vice President, Finance and Administration in 1997. Prior to
joining OneSource, Mr. Landon was director of plans and controls for the
Consulting and Information Services Group at Lotus. Mr. Landon holds a B.S. from
Babson College.
 
     David Dominik joined OneSource as a Director in 1993. Mr. Dominik has been
a managing director at Bain Capital Inc. since January 1990. He is also a
director of Oacis Healthcare Holdings Corp., a clinical information systems
software company.
 
     Gregg S. Newmark joined OneSource as a Director in 1993. Since 1993 Mr.
Newmark has served as general partner of William Blair Venture Partners, as a
principal of William Blair & Company, L.L.C. and as a managing director of
William Blair Capital Partners.
 
ELECTION OF OFFICERS AND DIRECTORS
 
   
     The executive officers of OneSource are elected by the board of directors
on an annual basis and serve until their successors are duly elected and
qualified. Messrs. Dominik and Newmark were selected as directors of OneSource
pursuant to a Stockholders Agreement dated September 8, 1993, as amended, among
OneSource and its principal stockholders, which agreement will terminate as of
the effective date of this offering. For more information, see "Certain
Transactions." There are no family relationships among any of the executive
officers or directors of OneSource.
    
 
COMMITTEES OF THE BOARD OF DIRECTORS
 
   
     The board of directors has appointed a compensation committee consisting of
Messrs. Kahn and Dominik. The compensation committee reviews and evaluates the
compensation and benefits of all officers of OneSource, reviews general policy
matters relating to compensation and benefits of OneSource employees and make
recommendations concerning these matters to the board of directors. The
compensation committee also administers OneSource's stock option and stock
purchase plans. For more information, see "--Equity Plans."
    
 
   
     The board of directors has also appointed an audit committee consisting of
Messrs. Kahn and Newmark. The audit committee reviews, with OneSource's
independent auditors, the scope and timing of their audit services and any other
services they are asked to perform, the auditors' report on OneSource's
consolidated financial statements following completion of their audit, and
OneSource's policies and procedures with respect to internal accounting and
financial controls. In addition, the audit committee will make annual
recommendations to the board of directors for the appointment of independent
auditors for the ensuing year.
    
 
DIRECTOR COMPENSATION
 
   
     Directors who are not employees of OneSource and who are not affiliated
with principal stockholders (also referred to as "outside directors"), will
receive an annual retainer fee and a fee for attending regular or special
meetings of the board of directors and for meetings of any committees of the
board of directors on which they serve, if committee meetings are held
separately. Currently, Mr. Kahn is the only outside director. Outside directors
also are eligible to participate in OneSource's 1999 Stock Option and Incentive
Plan. Directors also are reimbursed for reasonable out-of-pocket expenses
incurred in attending such meetings. For more information, see "--Equity Plans,"
and "Certain Transactions."
    
 
                                       50
<PAGE>   52
 
COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION
 
   
     The compensation committee is comprised of Messrs. Kahn and Dominik.
Neither member of the compensation committee serves as a member of the board of
directors or compensation committee of any entity that has one or more executive
officers serving as a member of OneSource's board of directors or compensation
committee.
    
 
EXECUTIVE COMPENSATION
 
  Summary Compensation
 
   
     The following table sets forth the compensation earned by (a) the Chief
Executive Officer and (b) OneSource's four other most highly compensated
executive officers for services rendered in all capacities to OneSource during
the year ended December 31, 1998.
    
 
                           SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                                  ANNUAL COMPENSATION(1)
                                                  -----------------------       ALL OTHER
          NAME AND PRINCIPAL POSITION               SALARY        BONUS      COMPENSATION(2)
          ---------------------------             ----------    ---------    ---------------
<S>                                               <C>           <C>          <C>
Daniel J. Schimmel..............................   $164,997      $57,749              --
  President and Chief Executive Officer
James A. Becker.................................    123,748       24,750              --
  Vice President, Global Strategic Web
  Applications Team
Philip J. Garlick...............................    144,000       47,520        $145,725
  Vice President, Global Enterprise Sales and
  Marketing
Mark C. VanDine.................................    115,498       23,100              --
  Vice President, Engineering
Roy D. Landon...................................    105,186       21,037              --
  Vice President, Finance and Administration
</TABLE>
 
- ------------
   
(1) OneSource did not make any restricted stock awards, grant any stock
    appreciation rights or make any long-term incentive payments during 1998 to
    its executive officers. Options granted to the named executive officers were
    granted at fair market value as determined by the board of directors based
    on all factors available to them on the grant date.
    
 
   
(2) Mr. Garlick received additional compensation in connection with his
    relocation from the UK to Massachusetts, including car and housing
    allowances, moving expenses and payment of taxes.
    
 
  Option Grants in Last Fiscal Year
 
   
     None of the named executive officers were granted options in the year ended
December 31, 1998.
    
 
                                       51
<PAGE>   53
 
  Option Exercises and Year-End Holdings
 
   
     The following table sets forth information concerning stock option
exercises during 1998 by each of the named executive officers and the number and
value of unexercised options held by them as of December 31, 1998.
    
 
      AGGREGATE OPTION EXERCISES IN 1998 AND FISCAL YEAR-END OPTION VALUES
 
   
<TABLE>
<CAPTION>
                                                                 NUMBER OF SECURITIES          VALUE OF UNEXERCISED
                                                                UNDERLYING UNEXERCISED         IN-THE-MONEY OPTIONS
                                    SHARES                    OPTIONS AT FISCAL YEAR-END       AT FISCAL YEAR-END(1)
                                  ACQUIRED ON      VALUE      ---------------------------   ---------------------------
              NAME                 EXERCISE     REALIZED(1)   EXERCISABLE   UNEXERCISABLE   EXERCISABLE   UNEXERCISABLE
              ----                -----------   -----------   -----------   -------------   -----------   -------------
<S>                               <C>           <C>           <C>           <C>             <C>           <C>
Daniel J. Schimmel..............         0             --      1,031,199             0      $9,975,489     $        0
  President and Chief Executive
  Officer
James A. Becker.................    44,770       $236,500        248,270       203,500       2,296,672      1,877,002
  Vice President, Global
    Strategic Web Applications
    Team
Philip J. Garlick...............         0             --        137,566       223,850       1,301,156      2,064,702
  Vice President, Global
    Enterprise Sales and
    Marketing
Mark C. VanDine.................         0             --        156,898       123,932       1,479,129      1,144,782
  Vice President, Engineering
Roy D. Landon...................         0             --        105,820        40,700       1,029,879        375,400
  Vice President, Finance and
    Administration
</TABLE>
    
 
- ------------
   
(1) There was no public trading market for the common stock as of December 31,
    1998. Accordingly, these values have been calculated by determining the
    difference between the assumed initial public offering price of $11.00 per
    share and the exercise price of the named executive officer's options.
    
 
EQUITY PLANS
 
   
     1999 Stock Option and Incentive Plan.  OneSource's 1999 Stock Option and
Incentive Plan was adopted by the board of directors in February 1999 and
approved by OneSource's stockholders in April 1999, to be effective upon the
completion of this offering. The 1999 Stock Option Plan provides for the grant
of stock-based awards to employees, officers and directors of, and consultants
or advisors to, OneSource. Under the 1999 Stock Option Plan, OneSource may grant
options that are intended to qualify as incentive stock options within the
meaning of Section 422 of the Internal Revenue Code of 1986, as amended, options
not intended to qualify as incentive stock options, restricted stock and other
stock-based awards. Incentive stock options may be granted only to employees of
OneSource. A total of 800,000 shares of common stock may be issued upon the
exercise of options or other awards granted under the 1999 Stock Option Plan
after the completion of this offering. The maximum number of shares with respect
to which awards may be granted to any employee under the 1999 Stock Option Plan
shall not exceed 100,000 shares of common stock during any calendar year.
    
 
   
     The 1999 Stock Option Plan is administered by the board of directors and
the compensation committee. Subject to the provisions of the 1999 Stock Option
Plan, each of the board of directors and the compensation committee has the
authority to select the persons to whom
    
 
                                       52
<PAGE>   54
 
   
awards are granted and determine the terms of each award, including the number
of shares of common stock subject to the award. Payment of the exercise price of
an award may be made in cash, shares of common stock, a combination of cash and
stock, a promissory note or by any other method approved by the board or
compensation committee, consistent with Section 422 of the Code and Rule 16b-3
under the Exchange Act. Unless otherwise permitted by the board of directors,
awards are not assignable or transferable except by will or the laws of descent
and distribution, and, during the participant's lifetime, may be exercised only
by the participant.
    
 
   
     The board of directors or compensation committee may, in its sole
discretion, amend, modify or terminate any award granted or made under the 1999
Stock Option Plan, so long as the amendment, modification or termination would
not materially and adversely affect the participant. The board of directors or
compensation committee may also, in its sole discretion, accelerate or extend
the date or dates on which all or any particular option or options granted under
the 1999 Stock Option Plan may be exercised.
    
 
   
     1993 Stock Purchase and Option Plan.  OneSource's 1993 Stock Purchase and
Option Plan was adopted by the board of directors and approved by OneSource's
stockholders in September 1993. Under the 1993 Plan, OneSource is authorized to
grant incentive stock options and non-qualified stock options to employees,
consultants, directors and advisors of OneSource. The aggregate number of shares
of common stock which may be issued under the 1993 Plan is 4,273,500 shares and
the aggregate number of shares of Class P common stock that may be issued under
the 1993 Plan is 40,700 shares. In February 1999, the board of directors, voted
to terminate the 1993 Plan effective immediately prior to the closing of this
offering.
    
 
   
     To date, OneSource has granted stock options to purchase an aggregate of
3,919,479 shares of common stock pursuant to the 1993 Plan.
    
 
   
     1999 Employee Stock Purchase Plan.  The 1999 Employee Stock Purchase Plan
was adopted by the board of directors in February 1999 and approved by
OneSource's stockholders in April 1999, to be effective upon the completion of
this offering. The 1999 Purchase Plan provides for the issuance of a maximum of
100,000 shares of common stock after the completion of this offering.
    
 
   
     The 1999 Purchase Plan is administered by the compensation committee of the
board of directors. All employees of OneSource whose customary employment is for
more than 20 hours per week and for more than five months in any calendar year
and who have completed more than three months of employment with OneSource on or
before the first day of any six-month payment period are eligible to participate
in the 1999 Purchase Plan. Employees who would own 5% or more of the total
combined voting power or value of OneSource's stock immediately after the grant
may not participate in the 1999 Purchase Plan. To participate in the 1999
Purchase Plan, an employee must authorize OneSource to deduct an amount (not
less than one percent nor more than 10 percent of a participant's total cash
compensation) from his or her pay during six-month payment periods. The first
payment period will commence upon the registration of OneSource's common stock
under the Exchange Act and will end on December 31, 1999. Thereafter, the
payment periods will commence on the six-month periods commencing on January 1
and July 1, respectively, and ending on the following June 30 and December 31,
respectively, of each year, but in no case shall an employee be entitled to
purchase more than 1,000 shares in any one payment period. The exercise price
for the option granted in each payment period is 85% of the lesser of the
average market price of the common stock on the first
    
 
                                       53
<PAGE>   55
 
   
or last business day of the payment period, in either event rounded up to the
nearest cent to avoid fractions of a dollar other than  1/4, 1/2 and  3/4. If an
employee is not a participant on the last day of the payment period, the
employee is not entitled to exercise his or her option, and the amount of his or
her accumulated payroll deductions will be refunded. Options granted under the
1999 Purchase Plan may not be transferred or assigned. An employee's rights
under the 1999 Purchase Plan terminate upon his or her voluntary withdrawal from
the plan at any time or upon termination of employment. No options have been
granted to date under the 1999 Purchase Plan.
    
 
401(K) PLAN
 
     OneSource has established a tax-qualified employee savings and retirement
plan. Employees must complete three months of service at OneSource before they
are eligible to participate on the first day of the month following the
completion. Employees may contribute a percentage of their pre-tax compensation
and OneSource may, in its discretion from year-to-year, make matching
contributions to the employees. Amounts matched by OneSource vest over three
years.
 
LIMITATION OF LIABILITY AND INDEMNIFICATION OF OFFICERS AND DIRECTORS
 
   
     OneSource's restated certificate of incorporation and amended and restated
by-laws provide that the directors and officers of OneSource shall be
indemnified by OneSource to the fullest extent authorized by Delaware law, as it
now exists or may in the future be amended, against all expenses and liabilities
reasonably incurred in connection with their service for or on behalf of
OneSource. In addition, the restated certificate of incorporation provides that
the directors of OneSource will not be personally liable for monetary damages to
OneSource for breaches of their fiduciary duty as directors, unless they
violated their duty of loyalty to OneSource or its stockholders, acted in bad
faith, knowingly or intentionally violated the law, authorized illegal dividends
or redemptions or derived an improper personal benefit from their action as
directors. OneSource intends to obtain insurance which insures the directors and
officers of OneSource against specified losses and which insures OneSource
against specific obligations to indemnify its directors and officers.
    
 
                                       54
<PAGE>   56
 
                              CERTAIN TRANSACTIONS
 
   
     In connection with the management buy-out from Lotus in 1993, each William
Blair Venture Partners III Limited Partnership and Information Partners Capital
Fund, L.P. and its affiliated entities purchased 329,669 and 329,665 shares
respectively, of Class P common stock for $1.62 million each, or $4.91 per
share, and 2,967,029 and 2,967,027 shares respectively, of common stock for
$180,000 each, or $0.06 per share. The shares of common stock held by William
Blair Venture Partners and Information Partners Capital are subject to
registration rights entitling the holder to demand that OneSource register the
shares under the Securities Act in some circumstances to enable the holder to
resell its shares. For more information, see "Shares Eligible For Future Sale."
A Stockholders Agreement, as amended, among OneSource, William Blair Venture
Partners, Information Partners Capital and other stockholders provides that, for
so long as William Blair Venture Partners or Information Partners Capital
continues to own at least 25% of the common stock which each entity originally
purchased in the buy-out, OneSource shall cause a representative of each of
William Blair Venture Partners and Information Partners Capital to be nominated
to the board of directors. Mr. Newmark, a general partner of William Blair
Venture Management Company, which is the general partner of William Blair
Venture Partners, currently serves as the William Blair Venture Partners
representative. Mr. Dominik, a general partner of Information Partners, Inc.,
which is the general partner of Information Partners Capital, currently serves
as the Information Partners Capital representative. The Stockholders Agreement
will be terminated upon consummation of this offering.
    
 
   
     Since 1993, OneSource has paid each of William Blair Venture Partners and
an affiliate of Information Partners Capital an annual management fee of $0.1
million, pursuant to an oral arrangement. OneSource has agreed to pay each of
these entities a one-time fee of $0.5 million to terminate the management fee
arrangement. In addition, William Blair Venture Partners owns 329,669 shares of
Class P common stock and will participate in the recapitalization. For more
information, please see "Risk Factors--The offering will benefit William Blair &
Company, L.L.C., one of the underwriters."
    
 
   
     OneSource intends to use approximately $6.8 million of its net proceeds
from this offering to repay a note issued by OneSource to Lotus in connection
with the purchase of OneSource's business from Lotus in 1993. The note bears
interest at the rate of 8% per year and is due September 8, 2000, unless
accelerated upon the occurrence of any one of several events. The completion of
this offering would require OneSource to repay a significant portion of the note
if it is not repaid in full.
    
 
   
     In 1998, William Blair Venture Partners and Information Partners Capital
and its affiliates subscribed for an aggregate of $335,000 of services from
OneSource.
    
 
                                       55
<PAGE>   57
 
                       PRINCIPAL AND SELLING STOCKHOLDERS
 
   
     The following table sets forth certain information known to OneSource
regarding beneficial ownership of OneSource's common stock as of March 31, 1999
and as adjusted to reflect the sale of the shares of common stock in this
offering by:
    
 
   
     - each person known by OneSource to be the beneficial owner of more than 5%
       of OneSource's common stock;
    
 
   
     - each of OneSource's directors;
    
 
   
     - each named executive officer (for more information, see
       "Management--Executive Compensation");
    
 
   
     - all executive officers and directors as a group; and
    
 
   
     - each selling stockholder.
    
 
Unless otherwise indicated, to the knowledge of OneSource, each stockholder
possesses sole voting and investment power with respect to the shares listed,
except to the extent an individual stockholder's shares are owned jointly with
that person's spouse.
 
   
     The following table is based on 7,410,804 shares of common stock
outstanding prior to the offering and 9,926,500 shares outstanding upon
completion of the offering. The number of shares of common stock deemed
outstanding includes (a) one share of common stock for each share of outstanding
Class P common stock and (b) shares issuable pursuant to options and warrants
held by the respective person or group which may be exercised within 60 days
after March 31, 1999 ("presently exercisable stock options"), as set forth in
the table. For purposes of calculating each person's or group's percentage
ownership, presently exercisable stock options are included for that person or
group but not the presently exercisable stock options of any other person or
group.
    
 
                                       56
<PAGE>   58
 
   
     For more information, see "Management--Executive Officers and Directors."
Unless otherwise indicated, the address for each beneficial owner is c/o
OneSource Information Services, Inc., 150 CambridgePark Drive, Cambridge, MA
02140.
    
 
   
<TABLE>
<CAPTION>
                                                                                                SHARES BENEFICIALLY
                                           SHARES PRIOR TO THE OFFERING                           OWNED AFTER THE
                                      ---------------------------------------                       OFFERING IF
                                                                                   SHARES         UNDERWRITERS DO
                                                  NUMBER OF OPTIONS              OFFERED IF        NOT EXERCISE
                                                    AND WARRANTS                UNDERWRITERS       OVERALLOTMENT
                                                     EXERCISABLE                   DO NOT       -------------------      SHARES
                                      NUMBER OF   WITHIN 60 DAYS OF               EXERCISE      NUMBER OF              OFFERED IN
NAME AND ADDRESS OF BENEFICIAL OWNER   SHARES      MARCH 31, 1999     PERCENT   OVERALLOTMENT    SHARES     PERCENT   OVERALLOTMENT
- ------------------------------------  ---------   -----------------   -------   -------------   ---------   -------   -------------
<S>                                   <C>         <C>                 <C>       <C>             <C>         <C>       <C>
Information Partners Capital Fund,
  L.P.(1)....................         3,296,692               0        44.0%        390,642     2,906,050    29.3%       133,092
William Blair Venture Partners III
  Limited Partnership(2).....         3,296,698               0        44.0         729,662     2,567,036    25.9        132,542
Martin Kahn..................          162,800          507,445         8.5               0      670,245      6.4         80,430
Daniel J. Schimmel...........          162,800        1,031,199        14.1               0     1,193,999    10.9        143,270
James A. Becker..............           89,538          244,200         4.4               0      310,649      3.1         23,089
Philip J. Garlick............            8,138          137,566         1.9               0      145,704      1.5          7,176
Mark C. Van Dine.............           16,280          158,730         2.3               0      175,010      1.7          9,572
Roy D. Landon................           16,280          105,820         1.6               0      122,100      1.2         14,642
David Dominik(1).............         3,296,692               0        44.0         390,642     2,906,050    29.3        133,092
Gregg Newmark(2).............         3,296,698               0        44.0         729,662     2,567,036    25.9        132,542
Lotus Development Corporation...             0          407,000         5.2               0      407,000      3.9
  55 Cambridge Parkway
  Cambridge, MA 02139
Silicon Valley Bank..........                0           82,222         1.1          15,696       65,518        *          1,587
  40 Williams Street
  Suite 350
  Wellesley, MA 02481
All executive officers and directors
  as a group (8 persons).....         7,049,226       2,184,960        96.2       1,120,304     8,050,093    66.5        543,813
Total:.......................         7,049,226       2,674,182        96.4       1,136,000     8,522,611    67.6        545,400
</TABLE>
    
 
- ------------
   
  *  Less than 1%
    
 
   
 (1) Includes 113,824 shares owned by BCIP Associates and 123,347 shares owned
     by BCIP Trust Associates, L.P. The respective general partners of these
     entities, including Mr. Dominik, exercise sole voting and investment power
     with respect to the shares owned by such entities. The general partners of
     Information Partners are Mr. Dominik, Mark Nunnelly, Stephen G. Pagliuca,
     and Bain Capital Partners IV, L.P., whose general partner is a corporation
     wholly-owned by W. Mitt Romney. The general partners of BCIP Associates are
     Joshua Bekenstein, Roy Edgar Brakeman, III, Edward Conard, Dominic
     Ferrante, Jeremy Ferris, Adam W. Kirsch, Michael Krupka, Matthew Levin,
     Simon Lonergan, John W. Maki, Geoffrey S. Rehnert, W. Mitt Romney, Paul
     Spinale, Samantha Trotman and Mark B. Wolpow. The general partners of BCIP
     Trust Associates, L.P. are Prescott Ashe, Mr. Dominik, Paul B. Edgerley,
     Jonathan Lavine, Michael D. May, Ronald Mika, Mark Nunnelly, R. David
     Nurme, Stephen G. Pagliuca, Joseph Pretlow, Geoffrey S. Rehnert, Paul
     Spinale, Ann Marie Viglione, Robert F. White and Robert C. Gray. Each of
     these persons disclaims beneficial ownership of such shares except to the
     extent of his respective proportionate pecuniary interest therein.
    
 
   
 (2) The general partners of this entity, including Mr. Newmark, exercise sole
     voting and investment power with respect to the shares owned by such
     entity. The general partner of William Blair Venture Partners III Limited
     Partnership is William Blair Venture Management whose general partners are
     Mr. Newmark, Ellen Carnahan, Samuel Guren and William Blair & Company, a
     limited liability company with approximately 150 members. Each of these
     persons disclaims beneficial ownership of such shares except to the extent
     of his respective proportionate pecuniary interest therein.
    
 
                                       57
<PAGE>   59
 
                          DESCRIPTION OF CAPITAL STOCK
 
   
     Effective upon the closing of this offering and the filing of OneSource's
restated certificate of incorporation, the authorized capital stock of OneSource
will consist of 20,000,000 shares of common stock, par value $.01 per share, and
1,000,000 shares of preferred stock, par value $.01 per share.
    
 
   
     Prior to the closing of this offering and in accordance with OneSource's
certificate of incorporation as currently in effect, OneSource is authorized to
issue up to 20,000,000 shares of common stock, par value $.01 per share, of
which 6,693,685 shares are issued and outstanding and 1,250,000 shares of Class
P common stock, par value $.01 per share, of which 717,119 shares are issued and
outstanding. Prior to the closing of this offering, all shares of Class P common
stock and the preference amount thereon will be reclassified into 717,119 shares
of common stock. All shares of common stock issued in respect of the aggregate
preference amount will be repurchased by OneSource prior to completion of this
offering.
    
 
   
     The following summary description of OneSource's capital stock is not
intended to be complete and is qualified by reference to the provisions of
applicable law and to OneSource's restated certificate of incorporation and
amended and restated by-laws filed as exhibits to the registration statement of
which this prospectus is a part.
    
 
COMMON STOCK
 
   
     As of March 31, 1999, there were 7,410,804 shares of common stock
outstanding held by 57 stockholders of record. Based upon the number of shares
outstanding as of that date and giving effect to the following transactions,
there will be 9,926,500 shares of common stock outstanding after this offering:
    
 
   
     - the issuance of the 2,500,000 shares of common stock offered by OneSource
       in this offering
    
 
   
     - the reclassification of Class P common stock into common stock
    
 
   
     - the issuance of 15,696 shares of common stock upon partial exercise of a
       warrant by a selling stockholder
    
 
   
In addition, there will be outstanding stock options for the purchase of a total
of 3,919,479 shares of common stock and outstanding warrants for the purchase of
473,526 shares of common stock.
    
 
   
     Holders of common stock are entitled to one vote for each share held on all
matters submitted to a vote of stockholders and do not have cumulative voting
rights. Directors are elected by a plurality of the votes of the shares present
in person or by proxy at the meeting and entitled to vote in such election.
Holders of common stock are entitled to receive ratably such dividends, if any,
as may be declared by the board of directors out of funds legally available
therefor, subject to any preferential dividend rights of outstanding preferred
stock. Upon the liquidation, dissolution or winding up of OneSource, the holders
of common stock are entitled to receive ratably the net assets of OneSource
available after the payment of all debts and other liabilities of OneSource,
subject to the prior rights of any outstanding preferred stock. Holders of the
common stock have no preemptive, subscription, redemption or conversion rights,
nor are they entitled to the benefit of any sinking fund. The outstanding shares
of common stock are, and the shares offered by OneSource in this offering will
be, when issued and paid for, validly
    
 
                                       58
<PAGE>   60
 
issued, fully paid and nonassessable. The rights, powers, preferences and
privileges of holders of common stock are subject to, and may be adversely
affected by, the rights of the holders of shares of any series of preferred
stock which OneSource may designate and issue in the future.
 
PREFERRED STOCK
 
   
     The board of directors will be authorized, subject to any limitations
prescribed by law, without further stockholder approval, to issue from time to
time up to an aggregate of 1,000,000 shares of preferred stock, in one or more
series. Each series of preferred stock shall have the number of shares,
designations, preferences, voting powers, qualifications and special or relative
rights or privileges as shall be determined by the board of directors, which may
include, among others, dividend rights, voting rights, redemption and sinking
fund provisions, liquidation preferences, conversion rights and preemptive
rights.
    
 
   
     The stockholders of OneSource have granted the board of directors authority
to issue the preferred stock and to determine its rights and preferences in
order to eliminate delays associated with a stockholder vote on specific
issuances. The rights of the holders of common stock will be subject to the
rights of holders of any preferred stock issued in the future. The issuance of
preferred stock, while providing desirable flexibility in connection with
possible acquisitions and other corporate purposes, could adversely affect the
voting power or other rights of the holders of common stock, and could make it
more difficult for a third-party to acquire, or discourage a third-party from
attempting to acquire, a majority of the outstanding voting stock of OneSource.
OneSource has not, to date, issued any shares of preferred stock and has no
present plans to issue any shares of preferred stock.
    
 
DELAWARE LAW AND CERTAIN CHARTER AND BY-LAW PROVISIONS; ANTI-TAKEOVER EFFECTS
 
   
     Upon completion of this offering, OneSource will be subject to the
provisions of Section 203 of the General Corporation Law of Delaware. Section
203 prohibits a publicly-held Delaware corporation from engaging in a "business
combination" with an "interested stockholder" for a period of three years after
the date of the transaction in which the person became an interested
stockholder, unless the business combination is approved in a prescribed manner.
A "business combination" includes mergers, asset sales and other transactions
resulting in a financial benefit to the interested stockholder. Subject to
exceptions, an "interested stockholder" is a person who, together with
affiliates and associates, owns, or within the prior three years did own, 15% or
more of the corporation's outstanding voting stock.
    
 
   
     OneSource's restated certificate of incorporation provides that directors
may be removed only for cause by the affirmative vote of the holders of 75% of
the shares of capital stock of OneSource entitled to vote. In addition, under
the restated certificate of incorporation any vacancy on the board of directors,
however occurring, including a vacancy resulting from an enlargement of the
board, may only be filled by vote of a majority of the directors then in office.
The likely effect of the limitations on the removal of directors and filling of
vacancies is an increase in the time required for the stockholders to change the
composition of the board of directors.
    
 
   
     OneSource's restated by-laws to be adopted upon the closing of this
offering provide that any action required or permitted to be taken by the
stockholders of OneSource at an annual meeting or special meeting of
stockholders may only be taken if OneSource is given proper
    
 
                                       59
<PAGE>   61
 
   
advance notice of the action. The restated by-laws further provide that special
meetings of stockholders may only be called by a majority of the board of
directors, the chairman of the board of directors or the president of OneSource.
The foregoing provisions could have the effect of delaying until the next
stockholders meeting stockholder actions which are favored by the holders of a
majority of the outstanding voting securities of OneSource. However, the
restated by-laws provide that stockholders may take action by written consent.
    
 
   
     The General Corporation Law of Delaware provides generally that the
affirmative vote of a majority of the shares entitled to vote on any matter is
required to amend a corporation's certificate of incorporation or by-laws,
unless a corporation's certificate of incorporation or by-laws, as the case may
be, requires a greater percentage. OneSource's restated by-laws require the
affirmative vote of the holders of at least 75% of the issued and outstanding
shares of capital stock of OneSource entitled to vote to amend or repeal any of
the foregoing provisions of the restated by-laws. The 75% stockholder vote would
be in addition to any separate class vote that might be required pursuant to the
terms of any series of preferred stock that might be outstanding at the time any
amendments are submitted to stockholders.
    
 
TRANSFER AGENT AND REGISTRAR
 
   
     The transfer agent and registrar for the common stock will be American
Stock Transfer & Trust Company.
    
 
                                       60
<PAGE>   62
 
                        SHARES ELIGIBLE FOR FUTURE SALE
 
   
     Upon completion of this offering, OneSource will have 9,926,500 shares of
common stock outstanding, assuming no exercise of outstanding options or
warrants. Of these shares, the 3,636,000 shares, 4,181,400 shares if the
over-allotment option is exercised in full, to be sold in this offering will be
freely tradable without restriction or further registration under the Securities
Act, except that any shares purchased by affiliates of OneSource, as that term
is defined in Rule 144 under the Securities Act, may generally only be sold in
compliance with the limitations of Rule 144 described below.
    
 
SALES OF RESTRICTED SHARES
 
   
     The remaining 6,290,500 shares of common stock outstanding upon completion
of this offering are deemed "restricted shares" under Rule 144 or Rule 701 under
the Securities Act. Approximately 170,926 restricted shares will be eligible for
sale in the public market pursuant to Rule 144(k) on the date of this
prospectus. Upon expiration of lock-up agreements with the underwriters, 180
days after the date of this prospectus, an additional 5,307,162 shares of common
stock will be eligible for sale in the public market pursuant to Rule 144 under
the Securities Act.
    
 
   
     In general, under Rule 144, a person, or persons whose shares are
aggregated, including an affiliate, who has beneficially owned restricted shares
for at least one year is entitled to sell, within any three-month period, a
number of his or her shares that does not exceed the greater of
    
 
   
     - one percent of the then outstanding shares of common stock, approximately
99,265 shares immediately after this offering or
    
 
   
     - the average weekly trading volume in the common stock in the
over-the-counter market during the four calendar weeks preceding the date on
which notice of the sale is filed, provided requirements concerning availability
of public information, manner of sale and notice of sale are satisfied. In
addition, affiliates must comply with the restrictions and requirements of Rule
144, other than the one-year holding period requirement, in order to sell shares
of common stock which are not restricted shares. Under Rule 144(k), a person who
is not an affiliate and has not been an affiliate for at least three months
prior to the sale and who has beneficially owned restricted shares for at least
two years may resell the shares without compliance with the foregoing
requirements. In meeting the one- and two-year holding periods described above,
a holder of restricted shares can include the holding periods of a prior owner
who was not an affiliate. The one- and two-year holding periods described above
do not begin to run until the full purchase price or other consideration is paid
by the person acquiring the restricted shares from the issuer or an affiliate.
Rule 701 provides that currently outstanding shares of common stock acquired
under OneSource's employee compensation plans may be resold by persons, other
than affiliates, beginning 90 days after the date of this prospectus, subject
only to the manner of sale provisions of Rule 144, and by affiliates under Rule
144, without compliance with its one-year minimum holding period, subject to
specified limitations.
    
 
OPTIONS
 
   
     Rule 701 also provides that the shares of common stock acquired upon the
exercise of currently outstanding options or pursuant to other rights granted
under OneSource's stock plans may be resold by persons, other than affiliates,
beginning 90 days after the date of this
    
 
                                       61
<PAGE>   63
 
   
prospectus, subject only to the manner of sale provisions of Rule 144, and by
affiliates under Rule 144, without compliance with its one-year minimum holding
period, subject to limitations. As of the date of this prospectus, the board of
directors has authorized an aggregate of up to 4,819,487 shares of common stock
for issuance pursuant to OneSource's stock option and stock purchase plans. At
March 31, 1999, 2,777,909 shares of common stock were issuable pursuant to
outstanding vested options or pursuant to other rights granted under OneSource's
stock plan(s), of which approximately 588,869 shares are not subject to lock-up
agreements with the underwriters and will be eligible for sale in the public
market in accordance with Rule 701 under the Securities Act beginning 90 days
after the date of this prospectus; 1,141,570 shares of common stock are issuable
pursuant to outstanding options that are not yet exercisable; and 900,000 shares
of common stock are available for future grants under OneSource's stock option
and stock purchase plans.
    
 
   
     OneSource intends to file one or more registration statements on Form S-8
under the Securities Act 90 days after the date of this prospectus to register
all shares of common stock which are issuable pursuant to OneSource's stock
option and stock purchase plans. The registration statements are expected to
become effective upon filing. Shares covered by the registration statements will
thereupon be eligible for sale in the public markets.
    
 
   
WARRANTS
    
 
   
     Pursuant to Rule 144, 473,526 shares of common stock issuable upon exercise
of outstanding warrants which are fully exercisable will be freely tradable one
year from the date the warrants are exercised.
    
 
LOCK-UP AGREEMENTS
 
   
     OneSource, its executive officers and directors, the selling stockholders
and Lotus have agreed not to sell or transfer any shares of common stock (or any
security convertible into or exchangeable or exercisable for common stock), or
to engage in hedging transactions with respect to the common stock without the
prior written consent of William Blair & Company, L.L.C. for a period of 180
days from the date of this prospectus. In addition, for a period of 180 days
from the date of this prospectus, except as required by law, OneSource has
agreed that its board of directors will not consent to any offer for sale, sale
or other disposition, or any transaction which is designed or could be expected
to result in the disposition by any person, directly or indirectly, of any
shares of common stock without the prior written consent of William Blair. For
more information, see "Underwriting." William Blair in its sole discretion at
any time or from time to time and without notice may release for sale in the
public market all or any portion of the shares subject to the lock-up
agreements.
    
 
REGISTRATION RIGHTS
 
   
     Upon the expiration of the contractual lock-up period, particular security
holders of OneSource will be entitled to require OneSource to register under the
Securities Act up to a total of 5,530,284 shares of outstanding common stock
under the terms of a registration rights agreement between OneSource and the
holders of the shares. The registration rights agreement provides that if
OneSource proposes to register in a firm commitment underwritten offering any of
its securities under the Securities Act at any time or times, these security
holders, subject to exceptions, shall be entitled to include some of their
shares in the registration. However, the
    
 
                                       62
<PAGE>   64
 
   
managing underwriter of any such offering may exclude for marketing reasons some
or all of the shares from the registration. The security holders also have,
subject to conditions and limitations, the right to require OneSource, no more
than once in any six-month period, to prepare and file a registration statement
under the Securities Act with respect to their shares. OneSource is generally
required to bear the expenses of all these registrations, except underwriting
discounts and commissions.
    
 
   
     Prior to this offering, there has been no public market for the common
stock of OneSource, and no predictions can be made as to the effect, if any,
that market sales of shares of common stock prevailing from time to time, or the
availability of shares for future sale, may have on the market price for our
common stock. Sales of substantial amounts of common stock, or the perception
that these sales could occur, could adversely affect prevailing market prices
for our common stock and could impair OneSource's future ability to obtain
capital through an offering of equity securities.
    
 
                                       63
<PAGE>   65
 
                                  UNDERWRITING
 
   
     The several underwriters named below, for which William Blair & Company,
L.L.C., U.S. Bancorp Piper Jaffray Inc. and Adams, Harkness & Hill, Inc. are
acting as representatives, have severally agreed, subject to the terms and
conditions set forth in the underwriting agreement among OneSource, the selling
stockholders and the underwriters, to purchase from OneSource and the selling
stockholders, and OneSource and the selling stockholders have agreed to sell to
each of the underwriters, the respective number of shares of common stock set
forth opposite each underwriter's name in the table below.
    
 
   
<TABLE>
<CAPTION>
                                                              NUMBER OF
UNDERWRITER                                                    SHARES
- -----------                                                   ---------
<S>                                                           <C>
William Blair & Company, L.L.C. ............................
U.S. Bancorp Piper Jaffray Inc. ............................
Adams, Harkness & Hill, Inc. ...............................
                                                              ---------
     Total..................................................  3,636,000
                                                              =========
</TABLE>
    
 
   
     This offering will be underwritten on a firm commitment basis. In the
underwriting agreement, the underwriters have agreed, subject to the terms and
conditions set forth therein, to purchase the shares of common stock being sold
pursuant thereto at a price per share equal to the public offering price less
the underwriting discount specified on the cover page of this prospectus.
According to the terms of the underwriting agreement, the underwriters will
either purchase all of the shares or none of them. In the event of default by
any underwriter, in certain circumstances the purchase commitments of the
non-defaulting underwriters may be increased or the underwriting agreement may
be terminated.
    
 
   
     The representatives of the underwriters have advised OneSource and the
selling stockholders that the underwriters will offer the shares of common stock
to the public at the public offering price specified on the cover page of this
prospectus. The underwriters may also offer the shares to dealers at the public
offering price less a concession of up to $     per share. The underwriters may
allow, and these dealers may re-allow, a concession of up to $     per share to
certain other dealers. The underwriters will offer the shares subject to prior
sale and subject to receipt and acceptance of the shares by the underwriters.
The underwriters may reject any order to purchase shares in whole or in part.
The underwriters expect that OneSource and the selling stockholders will deliver
the shares to the underwriters through the facilities of the Depository Trust
Company in New York, New York on or about              , 1999. At that time, the
underwriters will pay OneSource and the selling stockholders for the shares in
immediately available funds. After the commencement of the initial public
offering, the representatives may change the public offering price and the other
selling terms.
    
 
   
     The underwriters have the option to purchase up to an aggregate of 545,400
additional shares of common stock from the selling stockholders at the same
price they are paying for the 3,636,000 shares offered hereby. The underwriters
may purchase additional shares only to cover over-allotments made in connection
with this offering and only within 30 days after the date of this prospectus. If
the underwriters decide to exercise this over-allotment option, each underwriter
will be required to purchase additional shares in approximately the same
proportion as set forth in the table above. The underwriters will offer any
additional shares that they purchase on the terms described in the preceding
paragraph.
    
 
                                       64
<PAGE>   66
 
   
     The following table summarizes the compensation to be paid by OneSource and
the selling stockholders to the underwriters:
    
 
   
<TABLE>
<CAPTION>
                                                                         TOTAL
                                                     ---------------------------------------------
                                        PER SHARE    WITHOUT OVER-ALLOTMENT    WITH OVER-ALLOTMENT
                                        ---------    ----------------------    -------------------
<S>                                     <C>          <C>                       <C>
Public offering price.................
Underwriting discount paid by
  OneSource...........................
Underwriting discount paid by the
  selling stockholders................
</TABLE>
    
 
   
     OneSource estimates the expenses of this offering payable by OneSource
(excluding the underwriting discount) to be $750,000.
    
 
   
     OneSource and the selling stockholders have agreed to indemnify the
underwriters and their controlling persons against specific liabilities,
including liabilities under the Securities Act.
    
 
   
     OneSource, its executive officers and directors, the selling stockholders
and Lotus have agreed not to sell or transfer any shares of common stock, or to
engage in hedging transactions with respect to the common stock, for a period of
180 days from the date of this prospectus without the consent of William Blair,
except in limited circumstances. After giving effect to this offering,
stockholders who have agreed to this lock-up arrangement will hold an aggregate
of 7,049,226 shares of common stock, options to purchase 2,775,120 shares of
common stock and warrants to purchase 473,526 shares of common stock. For more
information, see "Shares Eligible for Future Sale."
    
 
   
     In connection with this offering, the underwriters and other persons
participating in this offering may engage in transactions which affect the
market price of the common stock. These may include stabilizing and
over-allotment transactions and purchases to cover syndicate short positions.
Stabilizing transactions consist of bids or purchases for the purpose of
pegging, fixing or maintaining the price of the common stock. Over-allotment
involves selling more shares of common stock in this offering than are specified
on the cover page of this prospectus, which results in a syndicate short
position. The underwriters may cover this short position by purchasing common
stock in the open market or by exercising all or part of their over-allotment
option. In addition, the representatives of the underwriters may impose a
penalty bid. This allows the representatives to reclaim the selling concession
allowed to an underwriter or selling group member if common stock sold by such
underwriter or selling group member in this offering is repurchased by the
representatives in stabilizing or syndicate short covering transactions. These
transactions, which may be effected on the Nasdaq National Market or otherwise,
may stabilize, maintain or otherwise affect the market price of the common stock
and could cause the price to be higher than it would be without these
transactions. The underwriters and other participants in this offering are not
required to engage in any of these activities and may discontinue any of these
activities at any time without notice. Neither OneSource nor any of the
underwriters makes any representation or prediction as to whether the
underwriters will engage in these transactions or choose to discontinue any
transactions engaged in or as to the direction or magnitude of any effect that
these transactions may have on the price of the common stock.
    
 
   
     The representatives of the underwriters have advised OneSource and the
selling stockholders that the underwriters do not intend to confirm, without
client authorization, sales to any account over which they exercise
discretionary authority.
    
 
                                       65
<PAGE>   67
 
   
     Prior to this offering, there has been no public market for OneSource's
common stock. Consequently, OneSource, representatives of the selling
stockholders and the representatives of the underwriters will negotiate to
determine the initial public offering price. They will consider current market
conditions, OneSource's operating results in recent periods, the market
capitalization of other companies in its industry, estimates of OneSource's
potential and other factors they deem relevant. The estimated price range
specified on the cover page of this prospectus may change because of market
conditions and other factors.
    
 
   
     The underwriters have reserved for sale, at the initial public offering
price, up to 5% of the shares of common stock in this offering for OneSource
employees and other individuals with a relationship with OneSource. Purchases of
the reserved shares would reduce the number of shares available for sale to the
general public. The underwriters will offer any reserved shares which are not so
purchased to the general public on the same terms as the other shares.
    
 
   
     OneSource has applied for quotation of the common stock on the Nasdaq
National Market under the symbol "ONES."
    
 
   
     Some of the underwriters and their affiliates engage in transactions with,
and perform services for, OneSource in the ordinary course of business and have
engaged, and may in the future engage, in commercial banking and investment
banking transactions with OneSource. In connection with rendering these services
in the past, the underwriters and their affiliates have received customary
compensation.
    
 
   
     William Blair Venture Partners is an affiliate of William Blair. As such,
William Blair may be deemed to be an affiliate of OneSource under Rule 2720 of
the National Association of Securities Dealers, Inc. Mr. Newmark, a principal of
William Blair, currently serves on OneSource's board of directors as the
representative of William Blair Venture Partners. In addition, since 1993,
OneSource has paid William Blair Venture Partners an annual management fee of
$100,000 pursuant to an oral arrangement and OneSource will pay William Blair
Venture Partners $500,000 upon the closing of this offering to terminate this
arrangement. For more information, see "Principal and Selling Stockholders" and
"Certain Transactions." When an NASD member participates in an offering of an
affiliated company's equity securities, Rule 2720 of the NASD requires that a
"qualified independent underwriter" within the meaning of that rule participate
in the preparation of the registration statement and prospectus for the offering
and conduct due diligence as part of such preparation. In addition, the public
offering price can be no higher than that recommended by the qualified
independent underwriter. U.S. Bancorp Piper Jaffray has accepted the
responsibility of acting as the "qualified independent underwriter" with respect
to this offering and, accordingly, the initial public offering price specified
on the cover page of this prospectus does not exceed that recommended by U.S.
Bancorp Piper Jaffray in its capacity as such.
    
 
                                 LEGAL MATTERS
 
   
     The validity of the shares of common stock to be issued in this offering
will be passed upon for OneSource by Testa, Hurwitz & Thibeault, LLP, Boston,
Massachusetts. Legal matters in connection with the shares of common stock to be
issued in this offering, this prospectus and the related registration statement
and the underwriting agreement will be passed upon for the underwriters by
Sidley & Austin, Chicago, Illinois.
    
 
                                       66
<PAGE>   68
 
                                    EXPERTS
 
     The consolidated financial statements as of December 31, 1997 and 1998 and
for each of the three years in the period ended December 31, 1998 included in
this prospectus have been so included in reliance upon the report of
PricewaterhouseCoopers LLP, independent accountants, given on the authority of
said firm as experts in auditing and accounting.
 
                             ADDITIONAL INFORMATION
 
   
     OneSource has filed with the Commission a registration statement on Form
S-1 (including all amendments and exhibits thereto) under the Securities Act
with respect to the common stock in this offering. As permitted by the rules and
regulations of the Commission, this prospectus omits certain information
contained in the registration statement. For further information with respect to
OneSource and the common stock offered in this offering, you should refer to the
registration statement and to the exhibits and schedules filed as part thereof.
Statements contained in this prospectus regarding the contents of any agreement
or other document filed as an exhibit to the registration statement are not
necessarily complete, and in each instance reference is made to the copy of that
agreement or document filed as an exhibit to the registration statement, each
such statement being qualified in all respects by such reference. You may obtain
copies of all or any portion of the registration statement at prescribed rates
from the public reference facilities maintained by the Commission at Room 1024,
Judiciary Plaza, 450 Fifth Street, N.W., Washington, DC 20549, at its regional
offices located at Seven World Trade Center, New York, New York 10007 and 500
West Madison Street, Chicago, Illinois 60661, or by calling the Commission at
1-800-SEC-0330. In addition, the Commission maintains a Website that contains
reports, proxy and information statements and other information regarding
registrants (including OneSource) that file electronically with the Commission
which can be accessed at http://www.sec.gov.
    
 
     OneSource intends to furnish to its stockholders annual reports containing
consolidated financial statements audited by an independent public accounting
firm and with quarterly reports for each of the first quarters of each fiscal
year containing unaudited consolidated financial statements.
 
                                       67
<PAGE>   69
 
                      ONESOURCE INFORMATION SERVICES, INC.
 
                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS
 
   
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
Report of Independent Accountants...........................  F-2
Consolidated Balance Sheet as of December 31, 1997 and 1998
  and March 31, 1999 (unaudited) and Pro Forma March 31,
  1999 (unaudited)..........................................  F-3
Consolidated Statement of Operations for the Years Ended
  December 31, 1996, 1997 and 1998 and the Three Months
  Ended March 31, 1998 and 1999 (unaudited).................  F-4
Consolidated Statement of Changes in Stockholders' Deficit
  for the Years Ended December 31, 1996, 1997 and 1998 and
  the Three Months Ended March 31, 1999 (unaudited).........  F-5
Consolidated Statement of Cash Flows for the Years Ended
  December 31, 1996, 1997 and 1998 and the Three Months
  Ended March 31, 1998 and 1999 (unaudited).................  F-7
Notes to Consolidated Financial Statements..................  F-8
</TABLE>
    
 
                                       F-1
<PAGE>   70
 
                       REPORT OF INDEPENDENT ACCOUNTANTS
 
To the Board of Directors and Stockholders of
OneSource Information Services, Inc.
 
   
     The 2.035 for 1.0 stock split approved on April 13, 1999 described in Note
6 to the consolidated financial statements has not been consummated at April 22,
1999. When it has been consummated, we will be in a position to furnish the
following report:
    
 
   
     "In our opinion, the accompanying consolidated balance sheet and the
related consolidated statements of operations, of changes in stockholders'
deficit and of cash flows present fairly, in all material respects, the
financial position of OneSource Information Services, Inc. and its subsidiary at
December 31, 1997 and 1998, and the results of their operations and their cash
flows for each of the three years in the period ended December 31, 1998 in
conformity with generally accepted accounting principles. These financial
statements are the responsibility of the Company's management; our
responsibility is to express an opinion on these financial statements based on
our audits. We conducted our audits of these statements in accordance with
generally accepted auditing standards which require that we plan and perform the
audit to obtain reasonable assurance about whether the financial statements are
free of material misstatement. An audit includes examining, on a test basis,
evidence supporting the amounts and disclosures in the financial statements,
assessing the accounting principles used and significant estimates made by
management, and evaluating the overall financial statement presentation. We
believe that our audits provide a reasonable basis for the opinion expressed
above."
    
 
PRICEWATERHOUSECOOPERS LLP
 
Boston, Massachusetts
   
February 26, 1999, except for Note 6,
    
   
as to which the date is April 13, 1999
    
 
                                       F-2
<PAGE>   71
 
                      ONESOURCE INFORMATION SERVICES, INC.
 
                           CONSOLIDATED BALANCE SHEET
                       (IN THOUSANDS, EXCEPT SHARE DATA)
 
   
<TABLE>
<CAPTION>
                                                                 DECEMBER 31,                      PRO FORMA
                                                              -------------------    MARCH 31,     MARCH 31,
                                                                1997       1998        1999          1999
                                                              --------   --------   -----------   -----------
                                                                                           (UNAUDITED)
                                                                                            (NOTE 2)
ASSETS
<S>                                                           <C>        <C>        <C>           <C>
Current assets:
  Cash and cash equivalents.................................  $    341   $  8,665    $  6,739      $  6,739
  Accounts receivable, net of allowance for doubtful
    accounts of $210, $300 and $288 at December 31, 1997 and
    1998 and March 31, 1999 (unaudited), respectively.......     8,703      9,621       4,822         4,822
  Deferred subscription costs...............................     5,037      6,662       5,789         5,789
  Prepaid expenses and other current assets.................       323        426         578           578
                                                              --------   --------    --------      --------
    Total current assets....................................    14,404     25,374      17,928        17,928
Property and equipment, net.................................     1,826      1,770       1,788         1,788
Restricted time deposit.....................................        --        100         515           515
Other assets................................................       414        402         492           492
                                                              --------   --------    --------      --------
      Total assets..........................................  $ 16,644   $ 27,646    $ 20,723      $ 20,723
                                                              ========   ========    ========      ========
LIABILITIES AND STOCKHOLDERS' DEFICIT
Current liabilities:
  Current portion of capital lease obligations..............  $    580   $    471    $    401      $    401
  Notes payable.............................................     1,530         --          --            --
  Accounts payable..........................................     1,204        995         729           729
  Accrued expenses..........................................     2,450      3,378       2,159         2,159
  Accrued royalties.........................................     2,684      4,626       2,347         2,347
  Deferred revenues.........................................    15,748     18,022      15,293        15,293
                                                              --------   --------    --------      --------
    Total current liabilities...............................    24,196     27,492      20,929        20,929
Capital lease obligations...................................       439        233         179           179
Long-term debt..............................................     5,622      6,232       6,270         6,270
                                                              --------   --------    --------      --------
      Total liabilities.....................................    30,257     33,957      27,378        27,378
                                                              --------   --------    --------      --------
Commitments (Note 13).......................................        --         --          --            --
Stockholders' deficit:
  Preferred stock, $0.01 par value:
    No shares authorized, issued or outstanding at December
    31, 1997 and 1998 and March 31, 1999 (unaudited);
    1,000,000 shares authorized, no shares issued and
    outstanding at March 31, 1999 on a pro forma basis
    (unaudited).............................................        --         --          --            --
  Class P common stock, $0.01 par value:
    1,250,000 shares authorized; 717,948, 717,119, and
    717,119 shares issued and outstanding at December 31,
    1997 and 1998 and March 31, 1999 (unaudited),
    respectively, at issuance cost (liquidation preference
    of $6,869 at March 31, 1999); no shares authorized,
    issued and outstanding at March 31, 1999 on a pro forma
    basis (unaudited).......................................     3,528      3,524       3,524            --
  Common stock, $0.01 par value: 20,000,000 shares
    authorized; 6,684,959, 6,775,313, 6,693,685 and
    7,714,915 shares issued; and 6,582,395, 6,665,423,
    6,693,685 and 7,714,915 shares outstanding, at December
    31, 1997 and 1998, March 31, 1999 (unaudited) and March
    31, 1999 on a pro forma basis (unaudited),
    respectively............................................        67         68          67            77
  Additional paid-in capital................................       362        724       1,176         4,690
  Unearned compensation.....................................        --        (39)       (464)         (464)
  Accumulated deficit.......................................   (17,432)   (10,444)    (10,856)      (10,856)
  Accumulated other comprehensive loss......................      (132)      (138)       (102)         (102)
  Common stock held in treasury, at cost....................        (6)        (6)         --            --
                                                              --------   --------    --------      --------
      Total stockholders' deficit...........................   (13,613)    (6,311)     (6,655)       (6,655)
                                                              --------   --------    --------      --------
      Total liabilities and stockholders' deficit...........  $ 16,644   $ 27,646    $ 20,723      $ 20,723
                                                              ========   ========    ========      ========
</TABLE>
    
 
  The accompanying notes are an integral part of these consolidated financial
                                  statements.

                                       F-3
<PAGE>   72
 
                      ONESOURCE INFORMATION SERVICES, INC.
 
                      CONSOLIDATED STATEMENT OF OPERATIONS
                (IN THOUSANDS, EXCEPT SHARE AND PER SHARE DATA)
 
   
<TABLE>
<CAPTION>
                                                                              THREE MONTHS ENDED
                                           YEAR ENDED DECEMBER 31,                 MARCH 31,
                                    -------------------------------------   -----------------------
                                       1996         1997         1998          1998         1999
                                    ----------   ----------   -----------   ----------   ----------
                                                                                  (UNAUDITED)
<S>                                 <C>          <C>          <C>           <C>          <C>
Revenues:
  Web-based product...............  $       15   $    3,312   $    16,058   $    2,628   $    6,903
  CD Rom product..................      30,419       27,072        14,370        5,322        1,240
                                    ----------   ----------   -----------   ----------   ----------
                                        30,434       30,384        30,428        7,950        8,143
                                    ----------   ----------   -----------   ----------   ----------
Cost of revenues:
  Web-based product...............         295        2,401         7,863        1,287        2,970
  CD Rom product..................      12,244       10,444         5,792        1,979          487
                                    ----------   ----------   -----------   ----------   ----------
                                        12,539       12,845        13,655        3,266        3,457
                                    ----------   ----------   -----------   ----------   ----------
  Gross profit....................      17,895       17,539        16,773        4,684        4,686
                                    ----------   ----------   -----------   ----------   ----------
Operating expenses:
  Selling and marketing...........       8,572        9,167        11,577        2,797        2,927
  Platform and product
    development...................       7,252        6,375         6,313        1,561        1,718
  General and administrative......       3,664        3,401         3,847          957          860
                                    ----------   ----------   -----------   ----------   ----------
    Total operating expenses......      19,488       18,943        21,737        5,315        5,505
                                    ----------   ----------   -----------   ----------   ----------
    Loss from operations..........      (1,593)      (1,404)       (4,964)        (631)        (819)
Interest expense..................        (752)        (943)         (878)        (247)        (192)
Interest income...................          19           13           283            3           99
Gain on sale of product line......          --          501        12,797           --           --
Other income......................         393           --            --           --          500
                                    ----------   ----------   -----------   ----------   ----------
    Income (loss) before income
       taxes......................      (1,933)      (1,833)        7,238         (875)        (412)
Provision for income taxes........          --           --           250           --           --
                                    ----------   ----------   -----------   ----------   ----------
    Net income (loss).............      (1,933)      (1,833)        6,988         (875)        (412)
                                    ----------   ----------   -----------   ----------   ----------
Less: income attributable to Class
  P common stock..................         335          414         1,367           72          139
                                    ----------   ----------   -----------   ----------   ----------
    Net income (loss) attributable
       to common stock............  $   (2,268)  $   (2,247)  $     5,621   $     (947)  $     (551)
                                    ==========   ==========   ===========   ==========   ==========
Class P common stock:
  Basic and diluted earnings per
    share.........................  $     0.47   $     0.57   $      1.91   $     0.10   $     0.19
  Weighted average Class P common
    shares outstanding............     718,966      717,948       717,541      717,948      717,119
Common stock:
  Basic earnings (loss) per
    share.........................  $    (0.35)  $    (0.34)  $      0.85   $    (0.14)  $    (0.08)
  Diluted earnings (loss) per
    share.........................  $    (0.35)  $    (0.34)  $      0.59   $    (0.14)  $    (0.08)
  Weighted average common shares
    outstanding:
    Basic.........................   6,486,959    6,545,343     6,640,834    6,620,952    6,685,164
    Diluted.......................   6,486,959    6,545,343     9,563,151    6,620,952    6,685,164
Unaudited pro forma earnings per
  share:
  Basic...........................                            $      0.91                $    (0.05)
  Diluted.........................                            $      0.66                $    (0.05)
  Weighted average common shares
    outstanding:
    Basic.........................                              7,644,012                 7,706,409
    Diluted.......................                             10,566,326                 7,706,409
</TABLE>
    
 
  The accompanying notes are an integral part of these consolidated financial
                                  statements.
                                       F-4
<PAGE>   73
 
                      ONESOURCE INFORMATION SERVICES, INC.
 
           CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' DEFICIT
                       (IN THOUSANDS, EXCEPT SHARE DATA)
   
<TABLE>
<CAPTION>
                                     CLASS P
                                   COMMON STOCK        COMMON STOCK      ADDITIONAL
                                 ----------------   ------------------    PAID-IN       UNEARNED     COMPREHENSIVE   ACCUMULATED
                                 SHARES    AMOUNT    SHARES     AMOUNT    CAPITAL     COMPENSATION   INCOME (LOSS)     DEFICIT
                                 -------   ------   ---------   ------   ----------   ------------   -------------   -----------
<S>                              <C>       <C>      <C>         <C>      <C>          <C>            <C>             <C>
Balance, December 31, 1995.....  719,983   $3,538   6,564,096    $65       $  343        $  --                        $(13,666)
Comprehensive loss:
 Net loss......................                                                                         $(1,933)        (1,933)
 Other comprehensive income
   (loss):
   Foreign currency translation
     adjustment................                                                                            (130)
                                                                                                        -------
     Comprehensive loss........                                                                          (2,063)
                                                                                                        =======
Issuance of common stock
 pursuant to exercise of
 options.......................                        30,476      1            3
Reacquisition and retirement of
 Class P common stock..........   (2,035)    (10)
Reacquisition of common stock
 for treasury..................
                                 -------   ------   ---------    ---       ------        -----                        --------
Balance, December 31, 1996.....  717,948   3,528    6,594,572     66          346           --                         (15,599)
Comprehensive loss:
 Net loss......................                                                                          (1,833)        (1,833)
 Other comprehensive income
   (loss):
   Foreign currency translation
     adjustment................                                                                              30
                                                                                                        -------
     Comprehensive loss........                                                                          (1,803)
                                                                                                        =======
Issuance of common stock
 pursuant to exercise of
 options.......................                        90,387      1           16
                                 -------   ------   ---------    ---       ------        -----                        --------
Balance, December 31, 1997.....  717,948   3,528    6,684,959     67          362           --                         (17,432)
Comprehensive income:
 Net income....................                                                                           6,988          6,988
 Other comprehensive income
   (loss):
   Foreign currency translation
     adjustment................                                                                              (6)
                                                                                                        -------
     Comprehensive income......                                                                           6,982
                                                                                                        =======
Issuance of common stock
 pursuant to exercise of
 options.......................                        90,354      1           22
Unearned compensation relating
 to grants of stock options....                                                45          (45)
Compensation relating to grants
 of stock options..............                                                              6
Compensation relating to
 modification of stock options
 on sale of product line.......                                               295
 
<CAPTION>
                                  ACCUMULATED
                                     OTHER        TREASURY STOCK         TOTAL
                                 COMPREHENSIVE   -----------------   STOCKHOLDERS'
                                     LOSS         SHARES    AMOUNT      DEFICIT
                                 -------------   --------   ------   -------------
<S>                              <C>             <C>        <C>      <C>
Balance, December 31, 1995.....      $ (32)        84,249    $(5)      $ (9,757)
Comprehensive loss:
 Net loss......................                                          (1,933)
 Other comprehensive income
   (loss):
   Foreign currency translation
     adjustment................       (130)                                (130)
 
     Comprehensive loss........
 
Issuance of common stock
 pursuant to exercise of
 options.......................                                               4
Reacquisition and retirement of
 Class P common stock..........                                             (10)
Reacquisition of common stock
 for treasury..................                    18,315     (1)            (1)
                                     -----       --------    ---       --------
Balance, December 31, 1996.....       (162)       102,564     (6)       (11,827)
Comprehensive loss:
 Net loss......................                                          (1,833)
 Other comprehensive income
   (loss):
   Foreign currency translation
     adjustment................         30                                   30
 
     Comprehensive loss........
 
Issuance of common stock
 pursuant to exercise of
 options.......................                                              17
                                     -----       --------    ---       --------
Balance, December 31, 1997.....       (132)       102,564     (6)       (13,613)
Comprehensive income:
 Net income....................                                           6,988
 Other comprehensive income
   (loss):
   Foreign currency translation
     adjustment................         (6)                                  (6)
 
     Comprehensive income......
 
Issuance of common stock
 pursuant to exercise of
 options.......................                                              23
Unearned compensation relating
 to grants of stock options....                                              --
Compensation relating to grants
 of stock options..............                                               6
Compensation relating to
 modification of stock options
 on sale of product line.......                                             295
</TABLE>
    
 
                                       F-5
<PAGE>   74
   
<TABLE>
<CAPTION>
                                     CLASS P
                                   COMMON STOCK        COMMON STOCK      ADDITIONAL
                                 ----------------   ------------------    PAID-IN       UNEARNED     COMPREHENSIVE   ACCUMULATED
                                 SHARES    AMOUNT    SHARES     AMOUNT    CAPITAL     COMPENSATION   INCOME (LOSS)     DEFICIT
                                 -------   ------   ---------   ------   ----------   ------------   -------------   -----------
<S>                              <C>       <C>      <C>         <C>      <C>          <C>            <C>             <C>
Reacquisition and retirement of
 Class P common stock..........     (829)     (4)
Reacquisition of common stock
 for treasury..................
                                 -------   ------   ---------    ---       ------        -----                        --------
Balance, December 31, 1998.....  717,119   3,524    6,775,313     68          724          (39)                        (10,444)
Comprehensive loss:
 Net loss (unaudited)..........                                                                            (412)          (412)
 Other comprehensive loss:
   Foreign currency translation
     adjustment (unaudited)....                                                                              36
                                                                                                        -------
 Comprehensive loss
   (unaudited).................                                                                         $  (376)
                                                                                                        =======
Issuance of common stock
 pursuant to exercise of
 options (unaudited)...........                        28,262     --           19
Unearned compensation relating
 to grants of stock options
 (unaudited)...................                                               438         (438)
Compensation relating to grants
 of stock options
 (unaudited)...................                                                             13
Retirement of treasury stock
 (unaudited)...................                      (109,890)    (1)          (5)
                                 -------   ------   ---------    ---       ------        -----                        --------
Balance, March 31, 1999
 (unaudited)...................  717,119   $3,524   6,693,685    $67       $1,176        $(464)                       $(10,856)
                                 =======   ======   =========    ===       ======        =====                        ========
 
<CAPTION>
                                  ACCUMULATED
                                     OTHER        TREASURY STOCK         TOTAL
                                 COMPREHENSIVE   -----------------   STOCKHOLDERS'
                                     LOSS         SHARES    AMOUNT      DEFICIT
                                 -------------   --------   ------   -------------
<S>                              <C>             <C>        <C>      <C>
Reacquisition and retirement of
 Class P common stock..........                                              (4)
Reacquisition of common stock
 for treasury..................                     7,326     --             --
                                     -----       --------    ---       --------
Balance, December 31, 1998.....       (138)       109,890     (6)        (6,311)
Comprehensive loss:
 Net loss (unaudited)..........                                            (412)
 Other comprehensive loss:
   Foreign currency translation
     adjustment (unaudited)....         36                                   36
 Comprehensive loss
   (unaudited).................
Issuance of common stock
 pursuant to exercise of
 options (unaudited)...........                                              19
Unearned compensation relating
 to grants of stock options
 (unaudited)...................                                              --
Compensation relating to grants
 of stock options
 (unaudited)...................                                              13
Retirement of treasury stock
 (unaudited)...................                  (109,890)     6             --
                                     -----       --------    ---       --------
Balance, March 31, 1999
 (unaudited)...................      $(102)            --    $--       $ (6,655)
                                     =====       ========    ===       ========
</TABLE>
    
 
  The accompanying notes are an integral part of these consolidated financial
                                  statements.
 
                                       F-6
<PAGE>   75
 
                      ONESOURCE INFORMATION SERVICES, INC.
 
                      CONSOLIDATED STATEMENT OF CASH FLOWS
                                 (IN THOUSANDS)
 
   
<TABLE>
<CAPTION>
                                                                                              THREE MONTHS
                                                                                                 ENDED
                                                               YEAR ENDED DECEMBER 31,         MARCH 31,
                                                             ----------------------------   ----------------
                                                              1996      1997       1998      1998     1999
                                                             -------   -------   --------   ------   -------
                                                                                              (UNAUDITED)
<S>                                                          <C>       <C>       <C>        <C>      <C>
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS
Cash flows relating to operating activities
  Net income (loss)........................................  $(1,933)  $(1,833)  $  6,988   $ (875)  $  (412)
  Adjustments to reconcile net income (loss) to net cash
    provided (used) by operating activities:
    Depreciation and amortization..........................    2,670     1,776      1,518      321       383
    Compensation expense relating to grants of stock
      options..............................................       --        --          6       --        13
    Amortization of debt discount..........................      108       142        121       30        38
    Loss on sale leaseback transaction.....................       --        --         45       45        --
    Gain on sale of product line...........................       --      (501)   (12,797)      --        --
    Other income from dispute settlement...................     (393)       --         --       --        --
    Changes in assets and liabilities:
      Accounts receivable..................................     (781)       17       (946)   2,592     4,763
      Deferred subscription costs..........................     (178)     (748)    (2,217)    (153)      873
      Prepaid expenses and other assets....................     (255)       14        (43)     (19)     (323)
      Accounts payable.....................................      509      (459)      (213)    (462)     (250)
      Accrued expenses.....................................      507       758      1,075      (17)   (1,194)
      Accrued royalties....................................       76      (128)     2,283     (368)   (2,279)
      Deferred revenues....................................      943       453      5,373     (833)   (2,602)
                                                             -------   -------   --------   ------   -------
    Net cash provided (used) by operating activities.......    1,273      (509)     1,193      261      (990)
                                                             -------   -------   --------   ------   -------
Cash flows relating to investing activities
  Investment in certificate of deposit.....................       --        --       (100)      --      (415)
  Purchases of property and equipment......................   (1,332)     (878)    (1,252)    (245)     (346)
  Capitalization of software development costs.............     (300)      (75)      (200)     (24)      (56)
  Net proceeds from sale of product line...................       --       501     10,563       --        --
                                                             -------   -------   --------   ------   -------
    Net cash provided (used) by investing activities.......   (1,632)     (452)     9,011     (269)     (817)
                                                             -------   -------   --------   ------   -------
Cash flows relating to financing activities
  Proceeds from issuance of common stock...................        4        17         23        6        19
  Repurchase of Class P common stock and common stock......      (11)       --         (4)      --        --
  Net borrowings (repayments) under line of credit.........     (400)      883     (1,183)      35        --
  Borrowings under term loan...............................      575        --         --       --        --
  Repayments of term loan..................................     (208)     (228)      (347)      --        --
  Proceeds from sale and leaseback of fixed assets.........      289       753        228      228        --
  Repayments of capital lease obligations..................     (402)     (607)      (684)    (228)     (124)
                                                             -------   -------   --------   ------   -------
    Net cash provided (used) by financing activities.......     (153)      818     (1,967)      41      (105)
                                                             -------   -------   --------   ------   -------
Effect of exchange rate changes on cash and cash
  equivalents..............................................       81       (51)        87        5       (14)
                                                             -------   -------   --------   ------   -------
Increase (decrease) in cash and cash equivalents...........     (431)     (194)     8,324       38    (1,926)
Cash and cash equivalents, beginning of period.............      966       535        341      341     8,665
                                                             -------   -------   --------   ------   -------
Cash and cash equivalents, end of period...................  $   535   $   341   $  8,665   $  379   $ 6,739
                                                             =======   =======   ========   ======   =======
Supplemental disclosure of cash flow information:
  Cash paid for interest...................................  $   218   $   301   $    209   $   90   $   547
  Cash paid for taxes......................................       --        --        175        4       154
Supplemental disclosure of noncash investing and financing
  activities:
  Additions to capital lease obligations for purchases of
    fixed assets...........................................  $   430   $    87   $    183   $  183   $    --
  Additions to capital lease obligations for sale and
    leaseback of fixed assets..............................      289       753        228      228        --
  Additions to long-term debt for accrued interest.........      440       480        489      489        --
  Exchange of property and equipment for the retirement of
    capital lease obligations..............................       --        --         41       --        --
</TABLE>
    
 
  The accompanying notes are an integral part of these consolidated financial
                                  statements.
                                       F-7
<PAGE>   76
 
                      ONESOURCE INFORMATION SERVICES, INC.
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
1.  NATURE OF BUSINESS
 
     OneSource Information Services, Inc. and its wholly-owned subsidiary
provide Web-based business and financial information to professionals in
corporations and other enterprises. OneSource primarily sells its products
through a direct sales force located throughout the United States and United
Kingdom. OneSource manages its business as a single segment.
 
2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
PRINCIPLES OF CONSOLIDATION
 
     The consolidated financial statements include the accounts of OneSource
Information Services, Inc. and OneSource Information Services Limited, its
wholly-owned subsidiary (collectively, "OneSource"). All significant
intercompany transactions and balances have been eliminated.
 
REVENUE RECOGNITION
 
     OneSource's products are sold on a subscription basis pursuant to customer
contracts that span varying periods of time but are generally for a period of
one year. In accordance with its customer agreements, OneSource initially
records receivables and defers the related revenue at the time amounts are
billed to customers. Revenues are recognized ratably over the related
subscription period.
 
SUBSCRIPTION COSTS
 
   
     Subscription costs represent sales commission and royalty costs that are
directly associated with securing a subscription and procuring information to be
delivered over the subscription period, respectively. These costs are deferred
and amortized ratably over the associated subscription period as a component of
selling and marketing expense and cost of revenues, respectively. At December
31, 1997 and 1998, deferred subscription costs consisted of $1,365,000 and
$1,250,000, respectively, related to sales commissions and $3,672,000 and
$5,412,000, respectively, related to royalties. At March 31, 1999 (unaudited),
deferred subscription costs consisted of $1,148,000 related to sales commissions
and $4,641,000 related to royalties.
    
 
CASH AND CASH EQUIVALENTS
 
     Cash equivalents consist of money market funds with original maturities of
three months or less and are stated at cost which approximates fair market
value. These funds are managed by a financial institution with a strong credit
rating. Accordingly, the investments are subject to minimal credit and market
risks.
 
PROPERTY AND EQUIPMENT
 
     Property and equipment are recorded at cost and depreciated over their
estimated useful lives, generally three to five years, using the straight-line
method. Equipment held under capital
 
                                       F-8
<PAGE>   77
                      ONESOURCE INFORMATION SERVICES, INC.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
leases is stated at the fair value of the equipment at inception of the leases
and is amortized on a straight-line basis over the term of the leases.
 
PLATFORM AND PRODUCT DEVELOPMENT AND SOFTWARE DEVELOPMENT COSTS
 
     Platform and product development costs, other than certain software
development costs, are charged to expense as incurred. Software development
costs incurred subsequent to the establishment of technological feasibility, and
prior to general release of the product, are capitalized and amortized on a
straight-line basis over the estimated useful lives of the related products,
generally twenty-four to thirty-six months. For the years ended December 31,
1996, 1997 and 1998, amortization of capitalized software development costs
amounted to $340,000, $413,000 and $198,000, respectively.
 
FINANCIAL INSTRUMENTS
 
     Fair values of OneSource's financial instruments, which include cash and
cash equivalents, restricted time deposits, accounts receivable, long-term debt
and capital lease obligations are based on quoted market prices and assumptions
concerning the amount and timing of estimated future cash flows and assumed
discount rates reflecting varying degrees of perceived risk. The carrying value
of these financial instruments approximated their fair value at December 31,
1997 and 1998.
 
CONCENTRATION OF CREDIT RISK
 
     Concentration of credit risk with respect to accounts receivable is limited
due to the large number of companies comprising OneSource's client base. Ongoing
credit evaluations of customers' financial condition are performed and
collateral is generally not required. OneSource maintains reserves for potential
credit losses and such losses, in the aggregate, have not exceeded management's
expectations.
 
ACCOUNTING FOR STOCK-BASED COMPENSATION
 
     OneSource accounts for stock-based compensation to employees in accordance
with Accounting Principles Board Opinion ("APB") No. 25, "Accounting for Stock
Issued to Employees" and related interpretation. Accordingly, compensation
expense is recorded for options issued to employees in fixed amounts to the
extent that the fixed exercise prices are less than the fair market value of
OneSource's common stock at the date of grant. OneSource follows the disclosure
requirements of Statement of Financial Accounting Standards ("SFAS") No. 123,
"Accounting for Stock-Based Compensation" (Note 8). All stock-based awards to
non-employees are accounted for at their fair value in accordance with SFAS No.
123.
 
   
UNAUDITED INTERIM FINANCIAL STATEMENTS
    
 
   
     Data and information as of March 31, 1999 and for the three months ended
March 31, 1998 and 1999 is unaudited. In the opinion of OneSource's management,
the March 31, 1998 and 1999 unaudited interim consolidated financial statements
include all adjustments, consisting of
    
 
                                       F-9
<PAGE>   78
                      ONESOURCE INFORMATION SERVICES, INC.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
   
normal recurring adjustments, necessary for a fair presentation of the financial
position and results of operations for that period. The results of operations
for the three month period ended March 31, 1999 are not necessarily indicative
of the results of operations for the year ended December 31, 1999.
    
 
UNAUDITED PRO FORMA BALANCE SHEET
 
   
     Prior to the closing of OneSource's initial public offering, each
outstanding share of Class P common stock (the "Class P stock") will be
reclassified into one share of common stock plus an additional number of shares
of common stock (determined by dividing the preference amount for such share by
the assumed initial public offering price of $11.00 per share). In addition,
upon the closing of OneSource's initial public offering, OneSource will file a
Restated Certificate of Incorporation which will authorize 1,000,000 shares of a
single class of undesignated preferred stock, $0.01 par value per share, will
cancel authorization of the Class P common stock and will have authorized
20,000,000 shares of common stock. This reclassification and other changes have
been reflected in the unaudited pro forma balance sheet as of March 31, 1999.
    
 
EARNINGS PER SHARE AND UNAUDITED PRO FORMA EARNINGS PER SHARE
 
     Earnings per share is computed in accordance with SFAS No. 128, "Earnings
Per Share." SFAS No. 128 requires the presentation of two amounts, basic
earnings per share and diluted earnings per share. The two-class method of
computing earnings per share has been used since the Class P stock and the
common stock share ratably in earnings remaining subsequent to the 12% yield on
the Class P stock.
 
     Earnings per share of Class P stock is calculated by dividing the yield
earned and income (loss) attributable to Class P stock by the weighted average
number of shares of Class P stock outstanding during the period. Diluted
earnings per share is the same for all periods presented as there are no
securities outstanding that would result in dilution for Class P stock.
 
     Earnings per share of common stock is calculated by dividing income (loss)
attributable to common stock by the weighted average number of shares of common
stock outstanding during the period. Diluted earnings per share is calculated by
considering the impact of potential common stock as if they were converted into
common stock at the beginning of the period. Potential common stock equivalents
are not included in loss periods as they are anti-dilutive.
 
   
     Unaudited pro forma basic and diluted earnings per share of common stock
for the year ended December 31, 1998 and three months ended March 31, 1999 have
been calculated based on net income applicable to all classes of common stock
and assuming the reclassification of OneSource's Class P common stock prior to
the completion of this offering, as if such reclassification had occurred at
January 1, 1998 for the year ended December 31, 1998 and at January 1, 1999 for
the three months ended March 31, 1999, respectively. Each share of Class P
common stock will be reclassified into one share of common stock plus an
additional number of shares of common stock (determined by dividing the
preference amount for such share by the assumed initial public offering price of
$11.00 per share).
    
 
                                      F-10
<PAGE>   79
                      ONESOURCE INFORMATION SERVICES, INC.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
FOREIGN CURRENCY TRANSLATION
 
     Assets and liabilities of OneSource's United Kingdom operations, where the
local currency is the functional currency, are translated into US dollars at the
exchange rate in effect as of the balance sheet date, while revenues and
expenses are translated at average exchange rates during the period. The
resultant translation adjustment is reflected as a separate component of
stockholders' deficit. Transaction gains and losses, which are not material in
amount, are reflected in the consolidated statement of operations.
 
USE OF ESTIMATES
 
     The preparation of financial statements in conformity with generally
accepted accounting principles requires OneSource management to make estimates
and assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting period. Actual results could differ from those estimates.
 
RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS
 
     In March 1998, the Accounting Standards Executive Committee ("AcSEC")
issued Statement of Position ("SOP") 98-1, "Accounting for the Costs of Computer
Software Developed or Obtained for Internal Use." SOP 98-1 establishes the
accounting for costs of software products developed or purchased for internal
use, including when such costs should be capitalized. OneSource does not expect
SOP 98-1, which is effective for OneSource beginning January 1, 1999, to have a
material effect on OneSource's financial condition or results of operations.
 
     In April 1998, the AcSEC issued SOP 98-5, "Reporting on the Costs of
Start-Up Activities." Start-up activities are defined broadly as those one-time
activities relating to opening a new facility, introducing a new product or
service, conducting business in a new territory, conducting business with a new
class of customer, commencing some new operation or organizing a new entity.
Under SOP 98-5, the cost of start-up activities should be expensed as incurred.
SOP 98-5 is effective for OneSource's calendar year 1999 financial statements
and OneSource does not expect its adoption to have a material effect on
OneSource's financial condition or results of operations.
 
     In June 1998, the Financial Accounting Standards Board issued SFAS No. 133,
"Accounting for Derivative Instruments and Hedging Activities." The new standard
establishes accounting and reporting standards for derivative instruments,
including certain derivative instruments embedded in other contracts, and for
hedging activities. SFAS No. 133 is effective for all fiscal quarters of fiscal
years beginning after June 15, 1999. OneSource does not expect SFAS No. 133 to
have a material effect on its financial condition or results of operations.
 
                                      F-11
<PAGE>   80
                      ONESOURCE INFORMATION SERVICES, INC.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
3.  PROPERTY AND EQUIPMENT
 
     Property and equipment consists of the following:
 
<TABLE>
<CAPTION>
                                                     DECEMBER 31,
                                                  ------------------
                                                   1997       1998
                                                  -------    -------
                                                    (IN THOUSANDS)
<S>                                               <C>        <C>
Office and computer equipment...................  $ 5,222    $ 5,478
Furniture and fixtures..........................      293        326
                                                  -------    -------
                                                    5,515      5,804
Less: accumulated depreciation and
  amortization..................................   (3,689)    (4,034)
                                                  -------    -------
                                                  $ 1,826    $ 1,770
                                                  =======    =======
</TABLE>
 
     At December 31, 1997 and 1998, office and computer equipment under capital
leases totaled $2,112,000 and $1,304,000, respectively. Related accumulated
amortization of assets under capital leases totaled $1,158,000 and $702,000 at
December 31, 1997 and 1998, respectively. During the years ended December 31,
1996, 1997 and 1998, OneSource sold and leased back certain computer equipment
with net book values of $308,000, $788,000, and $237,000, respectively for cash
proceeds of $289,000, $753,000 and $228,000. During 1998, OneSource retired
$525,000 of fully depreciated property and equipment.
 
4.  BORROWINGS
 
NOTES PAYABLE
 
     OneSource entered into a credit agreement (the "Agreement") with a bank, as
amended, which provides for a line of credit (the "Line") of up to $2,500,000
through April 1, 1998 and a term loan (the "Term Loan") of $750,000 to be used
for financing equipment purchases. At December 31, 1997, borrowings under the
Line were $1,183,000 and borrowings under the Term Loan were $347,000. During
1998, the Line and the Term Loan expired and were repaid in full.
 
LONG-TERM DEBT
 
     In connection with the acquisition of the business in 1993, OneSource
entered into a subordinated note agreement with the seller with a face amount of
$5,000,000 (the "Note"). The Note bears interest at 8% per annum, payable
annually commencing March 31, 1995 and has been discounted to reflect the market
rate of 12% at the time of issuance. The initial discount totaling $938,000 is
being amortized to interest expense over the life of the Note using the
effective interest method. As of December 31, 1998, the unamortized discount was
$291,000. Interest payments may be added to the unpaid principal of the Note if
OneSource's cash flow, as defined in the Note agreement, is less than a
specified amount.
 
     The Note, and any accrued but unpaid interest thereon, is due on the
earlier of i) September 8, 2000, ii) the date OneSource's stockholders, in
connection with an acquisition, cease to own a majority of the capital stock of
OneSource, or iii) the date OneSource sells substantially all of its assets. In
the event OneSource issues equity securities with net proceeds to
 
                                      F-12
<PAGE>   81
                      ONESOURCE INFORMATION SERVICES, INC.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
OneSource in excess of $10,000,000, OneSource is required to make a prepayment
of the principal amount as defined in the Note agreement. The Note agreement
requires OneSource to comply with certain restrictive covenants, including the
maintenance of specified financial ratios, and restricts OneSource from paying
dividends.
 
   
     In December 1996, OneSource reached a settlement agreement for an alleged
breach by the seller of a provision of the Note agreement regarding the initial
acquisition of the business. Under the terms of the settlement, the seller
forgave $393,000 of the principal on the Note, which amount has been recognized
as other income.
    
 
   
     As of December 31, 1998, the carrying value of the Note was $6,232,000. In
accordance with the terms of the Note agreement, OneSource has added $1,523,000
to the principal of the Note for interest which had accrued through the end of
December 31, 1997. Accrued interest related to the Note was $504,000 for the
year ended December 31, 1998 and, since OneSource met the cash flow requirements
set forth in the Note agreement, such amount is due by March 31, 1999. During
the three months ended March 31, 1999 (unaudited), OneSource paid the accrued
interest related to the Note.
    
 
5.  EARNINGS PER SHARE
 
     The following tables set forth the computation of earnings per share of
common stock and Class P stock from net income (loss):
 
   
<TABLE>
<CAPTION>
                                    YEAR ENDED DECEMBER 31,          THREE MONTHS ENDED MARCH 31,
                              ------------------------------------   -----------------------------
                                 1996         1997         1998          1998            1999
                              ----------   ----------   ----------   -------------   -------------
                                                                              (UNAUDITED)
<S>                           <C>          <C>          <C>          <C>             <C>
Numerator for common stock
  (in thousands):
  Net income (loss).........  $   (1,933)  $   (1,833)  $    6,988    $     (875)     $     (412)
  Less: income attributable
     to Class P stock.......         335          414        1,367            72             139
                              ----------   ----------   ----------    ----------      ----------
                              $   (2,268)  $   (2,247)  $    5,621    $     (947)     $     (551)
                              ==========   ==========   ==========    ==========      ==========
Denominator for common
  stock:
  Weighted average shares
     outstanding used for
     basic earnings per
     share..................   6,486,959    6,545,343    6,640,834     6,620,952       6,685,164
Effect of dilutive
  securities:
  Stock options.............          --           --    2,433,095            --              --
  Common stock warrants.....          --           --      489,222            --              --
                              ----------   ----------   ----------    ----------      ----------
  Weighted average shares
     outstanding used for
     diluted earnings per
     share..................   6,486,959    6,545,343    9,563,151     6,620,952       6,685,164
                              ==========   ==========   ==========    ==========      ==========
</TABLE>
    
 
                                      F-13
<PAGE>   82
                      ONESOURCE INFORMATION SERVICES, INC.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
   
     Total potential common equivalent shares consist of 3,547,916 stock options
outstanding with a weighted average exercise price of $1.43 per share and
489,222 common stock warrants exercisable at $0.06 per share as of December 31,
1998.
    
 
   
     (Unaudited)
    
 
   
     Total potential common equivalent shares consist of 3,919,479 stock options
outstanding with a weighted average exercise price of $2.19 per share and
489,222 common stock warrants exercisable at $0.06 per share as of March 31,
1999.
    
 
   
<TABLE>
<CAPTION>
                                    YEAR ENDED DECEMBER 31,          THREE MONTHS ENDED MARCH 31,
                              ------------------------------------   -----------------------------
                                 1996         1997         1998          1998            1999
                              ----------   ----------   ----------   -------------   -------------
                                                                              (UNAUDITED)
<S>                           <C>          <C>          <C>          <C>             <C>
Numerator for Class P stock
  (in thousands):
  Yield earned by Class P
     stock..................  $      586   $      660   $      742    $      177      $      200
  Income (loss) attributable
     to Class P stock.......        (251)        (246)         625          (105)            (61)
                              ----------   ----------   ----------    ----------      ----------
                              $      335   $      414   $    1,367    $       72      $      139
                              ==========   ==========   ==========    ==========      ==========
</TABLE>
    
 
     Basic and diluted earnings per share of Class P stock are the same for all
periods presented since there are no potentially dilutive securities.
 
6.  CLASS P COMMON STOCK AND COMMON STOCK
 
   
     In connection with its initial capitalization, OneSource issued 725,274
shares of Class P stock and 6,527,466 shares of common stock at $4.91 per share
and $0.06 per share, respectively. The holders of the Class P stock, as a
separate class, are entitled to receive first all or a portion of any
distribution, as defined, until the "preference amount" and the original
issuance cost has been paid in full. The preference amount is 12% compounded
quarterly. After all such payments have been made, the holders of the Class P
stock and of the common stock shall share pro rata in the remaining portion of
the distribution, as a single class. As of December 31, 1998, no dividends on
either the Class P stock or the common stock have been declared or paid, and no
payments of the aggregate yield have been made to the Class P stockholders. As a
result, the Class P stock is stated at its original issuance cost of $4.91 per
share. As of December 31, 1998, the liquidation preference of these shares was
$6,656,000. As of March 31, 1999 (unaudited), the liquidation preference of
these shares was $6,869,000.
    
 
     All holders of Class P stock and all holders of common stock are entitled
to one vote per share on all matters to be voted upon by OneSource's
stockholders. The Class P stock is not convertible into common stock without the
prior agreement of the Class P stockholders and OneSource.
 
   
     On April 13, 1999, OneSource authorized a 2.035 for one stock split on
common stock and Class P common stock. As a result, all common stock and Class P
common stock share data
    
 
                                      F-14
<PAGE>   83
                      ONESOURCE INFORMATION SERVICES, INC.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
   
included in the accompanying consolidated financial statements and notes have
been retroactively restated for this split.
    
 
7.  WARRANTS
 
   
     In connection with the Note agreement (Note 4), OneSource issued a warrant
exercisable at $0.06 per share for 407,000 shares of OneSource's common stock.
The warrant is currently exercisable and expires on September 8, 2002. In
connection with the credit agreement (Note 4), OneSource also issued a warrant
to the Term Loan holder which entitles the holder to purchase 82,222 shares of
OneSource's common stock at $0.06 per share. The warrant is currently
exercisable and expires on the later of September 8, 2003 or five years from the
effective date of an initial public offering of OneSource's common stock. The
fair value of these warrants at the date of issuance in 1993 was determined to
be $10,000 in the aggregate. OneSource has reserved 489,222 shares of common
stock for issuance upon exercise of the above warrants.
    
 
8.  STOCK PLANS
 
   
     The 1993 Stock Purchase and Option Plan (the "1993 Plan") provides for the
grant of incentive stock options and non-qualified stock options for the
purchase of up to an aggregate of 4,273,500 shares of OneSource's common stock
by employees, directors, consultants and advisors of OneSource. The Board of
Directors determines the term of each option, option price, number of shares for
which each option is granted, whether restrictions will be imposed on the shares
subject to options, and the vesting schedule of each option. The exercise price
for incentive stock options granted may not be less than the fair value per
share of the underlying common stock on the date granted as determined by the
Board of Directors (not less than 110% of the fair value for options granted to
holders of more than 10% of the voting stock of OneSource). Additionally, the
term of the options cannot exceed ten years (five years for options granted to
holders of more than 10% of the voting stock of OneSource). The options
generally vest over a four-year period.
    
 
     In February 1999, the Board of Directors of OneSource approved the 1999
Stock Option and Incentive Plan (the "1999 Stock Option Plan") to be effective
upon the closing of OneSource's initial public offering. The 1999 Stock Option
Plan provides for the grant of stock-based awards to employees, officers and
directors of, and consultants or advisors to, OneSource. A total of 800,000
shares of common stock are authorized for issuance upon the exercise of options
or other awards granted under the 1999 Stock Option Plan.
 
     In February 1999, the Board of Directors of OneSource approved the 1999
Employee Stock Purchase Plan (the "1999 Purchase Plan"), to be effective upon
the closing of OneSource's initial public offering. The 1999 Purchase Plan
provides for the issuance of a maximum of 100,000 shares of common stock.
 
                                      F-15
<PAGE>   84
                      ONESOURCE INFORMATION SERVICES, INC.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
     Transactions under the 1993 Plan during the years ended December 31, 1996,
1997 and 1998 are summarized as follows:
 
   
<TABLE>
<CAPTION>
                                                              WEIGHTED-
                                               NUMBER OF       AVERAGE
                                                SHARES      EXERCISE PRICE
                                               ---------    --------------
<S>                                            <C>          <C>
Outstanding--December 31, 1995...............  2,813,908        $1.07
  Granted (weighted average fair value of
     $0.12)..................................  1,263,125         1.73
  Exercised..................................    (30,476)        0.12
  Forfeited..................................   (174,758)        0.68
                                               ---------
Outstanding--December 31, 1996...............  3,871,799         1.31
  Granted (weighted average fair value of
     $0.12)..................................    294,261         1.73
  Exercised..................................    (90,387)        0.19
  Forfeited..................................   (469,149)        1.47
                                               ---------
Outstanding--December 31, 1997...............  3,606,524         1.35
  Granted (weighted average fair value of
     $0.82)..................................    204,925         2.18
  Exercised..................................    (90,354)        0.27
  Forfeited..................................   (173,179)        1.34
                                               ---------
Outstanding--December 31, 1998...............  3,547,916         1.43
                                               =========
</TABLE>
    
 
     The following table summarizes information about stock options outstanding
at December 31, 1998:
 
   
<TABLE>
<CAPTION>
                                                    WEIGHTED-
                                                     AVERAGE
                                                    REMAINING       NUMBER OF
                                      NUMBER       CONTRACTUAL       OPTIONS
          EXERCISE PRICE            OF OPTIONS    LIFE IN YEARS    EXERCISABLE
          --------------            ----------    -------------    -----------
<S>                                 <C>           <C>              <C>
$0.12.............................    754,064          4.9            744,755
 1.37.............................  1,375,457          6.4          1,011,293
 2.19.............................  1,418,395          6.7            974,409
                                    ---------                       ---------
                                    3,547,916          6.2          2,730,457
                                    =========                       =========
</TABLE>
    
 
   
     As of December 31, 1996 and 1997, 1,884,111 and 2,472,240 options were
exercisable, respectively, under the 1993 Plan. As of December 31, 1998, there
were 514,367 shares of common stock available for grant to employees under the
1993 Plan.
    
 
     The fair value of each option grant is estimated on the date of grant using
the minimum value method with the following assumptions for grants in 1996, 1997
and 1998: dividend yield of 0.0% for all years; risk-free interest rates of
6.4%, 6.2% and 5.2% for 1996, 1997 and 1998, respectively; and a
weighted-average expected option term of 5 years for all years.
 
                                      F-16
<PAGE>   85
                      ONESOURCE INFORMATION SERVICES, INC.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
     Compensation expense has been recognized for OneSource's stock option plan
under APB No. 25. Had compensation cost been determined based on the fair value
of the options at the grant date consistent with the provisions of SFAS No. 123,
OneSource's net income (loss) and earnings (loss) per share would have been
increased to the pro forma amounts indicated below:
 
   
<TABLE>
<CAPTION>
                                                   YEAR ENDED DECEMBER 31,
                                                 ----------------------------
                                                  1996       1997       1998
                                                 -------    -------    ------
<S>                                              <C>        <C>        <C>
Net income (loss) (in thousands):
  As reported..................................  $(1,933)   $(1,833)   $6,988
  Pro-forma....................................   (2,006)    (1,890)    6,909
Basic and diluted earnings per Class P common
  share:
  As reported..................................     0.47       0.57      1.91
  Pro-forma....................................     0.45       0.57      1.89
Basic earnings per common share:
  As reported..................................    (0.35)     (0.34)     0.85
  Pro-forma....................................    (0.36)     (0.35)     0.84
Diluted earnings per common share:
  As reported..................................    (0.35)     (0.34)     0.59
  Pro-forma....................................    (0.36)     (0.35)     0.58
</TABLE>
    
 
     Because options vest over several years and additional option grants are
expected to be made in future years, results of operations for future years may
be materially different if the provisions of SFAS No. 123 are applied.
 
   
     In conjunction with the sale of the CD-Insurance division, OneSource
modified the terms of 226,601 stock options held by terminated employees. In
accordance with APB No. 25, compensation expense of $295,000 was recorded as a
reduction of the gain on the sale of the insurance division in the year ended
December 31, 1998.
    
 
   
     During 1998, 203,093 stock options were granted with an exercise price of
$2.19 per share and 1,832 stock options were granted with an exercise price of
$1.37 per share; these exercise prices were below the estimated fair market
value of the common stock at the date of grant. Unearned compensation of $45,000
was recorded, in accordance with APB No. 25, and will be amortized over the
related vesting period. Related compensation expense of $6,000 was recorded
during the year ended December 31, 1998. Options issued during 1996 and 1997
were granted with exercise prices above the estimated fair market value of the
common stock at the date of grant.
    
 
   
(Unaudited)
    
 
   
     During the three months ended March 31, 1999, 40,700 stock options were
granted with an exercise price of $2.19 per share and 30,525 stock options were
granted with an exercise price of $5.90 per share; these exercise prices were
below the estimated fair market value of the common
    
 
                                      F-17
<PAGE>   86
                      ONESOURCE INFORMATION SERVICES, INC.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
   
stock at the date of grant. Unearned compensation of $438,000 was recorded in
accordance with APB No. 25, and will be amortized over the related vesting
period of four years. Related compensation expense of $10,000 was recorded
during the three months ended March 31, 1999.
    
 
9.  INCOME TAXES
 
     Components of the income (loss) before income taxes and extraordinary gain
and of the current provision for income taxes are as follows:
 
<TABLE>
<CAPTION>
                                                   YEAR ENDED DECEMBER 31,
                                                 ----------------------------
                                                  1996       1997       1998
                                                 -------    -------    ------
                                                        (IN THOUSANDS)
<S>                                              <C>        <C>        <C>
Income (loss) before income taxes and
  extraordinary gain:
  Domestic.....................................  $(1,976)   $(2,124)   $7,204
  Foreign......................................     (350)       291        34
                                                 -------    -------    ------
                                                 $(2,326)   $(1,833)   $7,238
                                                 =======    =======    ======
Current provision for income taxes:
  Federal......................................  $    --    $    --    $  200
  State........................................       --         --        45
  Foreign......................................       --         --         5
                                                 -------    -------    ------
                                                 $    --    $    --    $  250
                                                 =======    =======    ======
</TABLE>
 
     OneSource had no deferred provision for income taxes in each of the years
ended December 31, 1996, 1997 and 1998 due to the offsetting effects of the
valuation allowance on its net deferred tax assets. There was no income tax
effect related to the extraordinary gain on early extinguishment of debt in
1996. Provision has not been made for US or additional foreign taxes on
undistributed earnings of foreign subsidiaries as those earnings have been
permanently reinvested. Such taxes, if any, are not expected to be significant.
 
                                      F-18
<PAGE>   87
                      ONESOURCE INFORMATION SERVICES, INC.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
     Income taxes computed using the federal statutory income tax rate differ
from OneSource's effective tax rate primarily due to the following:
 
<TABLE>
<CAPTION>
                                                    YEAR ENDED DECEMBER 31,
                                                   -------------------------
                                                   1996     1997      1998
                                                   -----    -----    -------
                                                        (IN THOUSANDS)
<S>                                                <C>      <C>      <C>
Income tax expense (benefit) at US federal
  statutory tax rate.............................  $(657)   $(623)   $ 2,461
State income taxes, net of federal tax effect....   (115)    (125)       508
Permanent items..................................     79       20         21
Other............................................     20       (4)        36
Change in deferred tax asset valuation
  allowance......................................    673      732     (2,776)
                                                   -----    -----    -------
Provision for income taxes.......................  $  --    $  --    $   250
                                                   =====    =====    =======
</TABLE>
 
     Components of OneSource's deferred tax assets and liabilities are as
follows:
 
<TABLE>
<CAPTION>
                                                     DECEMBER 31,
                                                  ------------------
                                                   1997       1998
                                                  -------    -------
                                                    (IN THOUSANDS)
<S>                                               <C>        <C>
Deferred tax assets:
  Net operating loss carryforwards..............  $ 3,394    $   238
  Depreciation..................................      378        537
  Accrued expenses..............................      222        623
  Deferred revenues.............................    2,159      1,342
  Equity compensation...........................       --        123
  Miscellaneous.................................      120        133
                                                  -------    -------
     Gross deferred tax asset...................    6,273      2,996
  Less: valuation allowance.....................   (4,544)    (1,768)
                                                  -------    -------
     Total deferred tax assets..................    1,729      1,228
                                                  -------    -------
Deferred tax liabilities:
  Prepaid expenses..............................    1,068        513
  Deferred royalties............................      253        252
  Amortization of debt discount.................      163        217
  Capitalized software development costs........      126        127
  Tax operating leases..........................      119        119
                                                  -------    -------
     Total deferred tax liabilities.............    1,729      1,228
                                                  -------    -------
Net deferred tax assets.........................  $    --    $    --
                                                  =======    =======
</TABLE>
 
                                      F-19
<PAGE>   88
                      ONESOURCE INFORMATION SERVICES, INC.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
     Realization of OneSource's net deferred tax assets is contingent upon the
generation of future taxable income. Due to the uncertainty of realization of
these tax benefits, OneSource has provided a valuation allowance for the full
amount of its net deferred tax assets.
 
     During 1998, OneSource utilized $8,000,000 of net operating loss
carryforwards. At December 31, 1998, OneSource had net operating loss
carryforwards of $575,000 for foreign tax purposes which do not expire. Under
the provisions of the Internal Revenue Code, if certain substantial changes in
OneSource's ownership should occur, the amount of net operating loss
carryforwards which could be utilized annually to offset future taxable income
and income tax liability may be limited. The amount of any annual limitation is
determined based upon OneSource's value prior to an ownership change.
 
10.  SALE OF PRODUCT LINES
 
     In June 1997, OneSource sold its CD Rom banking product line for $650,000
in cash. In connection with the sale, OneSource entered a non-compete agreement
for five years. As a result of the sale, OneSource recorded a gain of $501,000
which is net of expenses of $149,000 incurred in conjunction with the sale. No
assets or liabilities with recorded net book values were transferred in
connection with this product line sale.
 
   
     In May 1998, OneSource sold its CD-Insurance division for $11,000,000 in
cash and entered a software license agreement for $4,000,000 to be received in
equal quarterly installments for two years commencing January 1, 1999. In
connection with the sale, OneSource also entered a non-compete agreement for
five years. As a result of the sale, OneSource recorded a gain of $12,797,000
which includes: (i) the recognition of $3,124,000 of deferred revenues and
$595,000 of deferred subscription costs based upon the assumption by the buyer
of all obligations to service the existing subscriber base of the insurance
division, (ii) $530,000 of employee severance costs and (iii) $202,000 of
expenses associated with the sale. Payments pertaining to the software license
agreement will be recognized in other income as support services are performed
and payments become due in accordance with the agreement. During the three
months ended March 31, 1999 (unaudited), OneSource recorded $500,000 of other
income related to the software license agreement.
    
 
11.  EMPLOYEE BENEFIT PLANS
 
     After three months of service, OneSource employees are eligible to
participate in a tax deferred savings plan (the "Savings Plan") under Section
401(k) of the Internal Revenue Code. OneSource matches 25% of the first 6%
contributed by the employee, and the employee becomes fully vested in
OneSource's matching contribution after three years of service. OneSource's
contributions to the Savings Plan totaled $122,000, $116,000 and $120,000 for
the years ended December 31, 1996, 1997 and 1998, respectively.
 
12.  RELATED PARTY TRANSACTIONS
 
     At December 31, 1997 and 1998, OneSource had accounts receivable of
$117,000 and $335,000, respectively, due from two stockholders. OneSource
recognized revenue of $200,000,
 
                                      F-20
<PAGE>   89
                      ONESOURCE INFORMATION SERVICES, INC.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
$292,000 and $318,000 in the years ended December 31, 1996, 1997, and 1998
respectively, from these parties.
 
     Management fees paid to a stockholder and an affiliate of another
stockholder totaling $200,000 for each of the years ended December 31, 1996,
1997 and 1998 are included in general and administrative expenses.
 
13.  COMMITMENTS
 
  Leases
 
     OneSource leases facilities and certain equipment under various
noncancellable operating lease agreements. Total rent expense under such leases
was $1,271,000, $1,191,000 and $1,146,000 for the years ended December 31, 1996,
1997, and 1998, respectively. Future minimum lease commitments under all
noncancellable capital and operating leases at December 31, 1998 are as follows:
 
<TABLE>
<CAPTION>
                                                     CAPITAL    OPERATING
                                                     LEASES      LEASES
                                                     -------    ---------
                                                        (IN THOUSANDS)
<S>                                                  <C>        <C>
1999...............................................   $490       $  920
2000...............................................    207          231
2001...............................................     80          223
2002...............................................     --          221
2003...............................................     --           68
                                                      ----       ------
Total minimum lease payments.......................    777       $1,663
                                                                 ======
Less: amount representing interest.................     73
                                                      ----
Present value of net minimum lease payments,
  including current maturities of $471.............   $704
                                                      ====
</TABLE>
 
     In January 1999, OneSource entered into a five-year noncancellable
operating lease for a new operating facility. Minimum yearly rental payments
will be $655,000, commencing in June 1999. Pursuant to the lease, OneSource
entered into a $415,000 irrevocable letter of credit collateralized by a
certificate of deposit.
 
  Restricted Time Deposit
 
     In connection with a facility lease, OneSource is required to maintain, on
behalf of the landlord, an irrevocable letter of credit with a bank in the
amount of $100,000 over the term of the lease. In addition, OneSource was
required to maintain a certificate of deposit in an equal amount as security for
the letter of credit.
 
                                      F-21
<PAGE>   90
                      ONESOURCE INFORMATION SERVICES, INC.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
14.  GEOGRAPHIC INFORMATION
 
     Revenue was distributed geographically as follows:
 
<TABLE>
<CAPTION>
                                           YEAR ENDED DECEMBER 31,
                                        -----------------------------
                                         1996       1997       1998
                                        -------    -------    -------
                                               (IN THOUSANDS)
<S>                                     <C>        <C>        <C>
United States.........................  $25,294    $24,193    $23,428
United Kingdom........................    5,140      6,191      7,000
                                        -------    -------    -------
                                        $30,434    $30,384    $30,428
                                        =======    =======    =======
</TABLE>
 
     Substantially all of OneSource's identifiable assets are located in the
United States.
 
                                      F-22
<PAGE>   91
 
     [The graphic contains the OneSource logo in the center of the page. Reading
from the top right diagonally to the bottom left of the page is the following
text: Turning World Class Information into Integrated Solutions For Demanding
Business Professionals Worldwide. The top left of the page depicts the names and
logos of the following OneSource information providers: The Investext Group;
Market Guide; Standard & Poor's; Comtex; Financial Times; Corp Tech; WorldScope
Disclosure; Hoover's Inc.; Reuters; and Dun & Bradstreet. The bottom half of the
page depicts the following OneSource customers by name and logo displayed
according to the following industry sectors noted in the text:
 
  Financial Institutions:
 
     Credit Suisse; Merrill Lynch; American Express: Bank of America.
 
  Professional Services:
 
     Bain & Company; KMPG; Deloitte Touche Tohmatsu; Ernst & Young.
 
  High Tech:
 
     Oracle; SAP; Platinum; IBM.
 
  Leading Corporations:
 
     Boeing; MCI Worldcom; BT; Nortel Networks.]
<PAGE>   92
 
- ------------------------------------------------------
- ------------------------------------------------------
 
     YOU SHOULD RELY ONLY ON THE INFORMATION CONTAINED IN THIS PROSPECTUS. WE
HAVE NOT AUTHORIZED ANYONE TO PROVIDE YOU WITH INFORMATION DIFFERENT FROM THAT
WHICH IS SET FORTH IN THIS PROSPECTUS. WE ARE OFFERING TO SELL SHARES OF COMMON
STOCK AND SEEKING OFFERS TO BUY SHARES OF COMMON STOCK ONLY IN JURISDICTIONS
WHERE OFFERS AND SALES ARE PERMITTED. THE INFORMATION CONTAINED IN THIS
PROSPECTUS IS ACCURATE ONLY AS OF THE DATE OF THIS PROSPECTUS, REGARDLESS OF THE
TIME OF DELIVERY OF THE PROSPECTUS OR OF ANY SALE OF COMMON STOCK.
 
                          ---------------------------
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                     PAGE
                                     ----
<S>                                  <C>
Prospectus Summary.................    3
Risk Factors.......................    7
Reclassification...................   18
Use of Proceeds....................   19
Dividend Policy....................   19
Capitalization.....................   20
Dilution...........................   21
Selected Consolidated Financial
  Data.............................   22
Management's Discussion and
  Analysis of Financial Condition
  and Results of Operations........   25
Business...........................   39
Management.........................   49
Certain Transactions...............   55
Principal and Selling
  Stockholders.....................   56
Description of Capital Stock.......   58
Shares Eligible for Future Sale....   61
Underwriting.......................   64
Legal Matters......................   66
Experts............................   67
Additional Information.............   67
Index to Consolidated Financial
  Statements.......................  F-1
</TABLE>
    
 
                          ---------------------------
 
   
     Until              , 1999 (25 days after the date of this prospectus), all
dealers effecting transactions in the registered securities, whether or not
participating in this distribution, may be required to deliver a prospectus.
This is in addition to the obligation of dealers to deliver a prospectus when
acting as underwriters and with respect to their unsold allotments or
subscriptions.
    
- ------------------------------------------------------
- ------------------------------------------------------
- ------------------------------------------------------
- ------------------------------------------------------
 
   
                                3,636,000 SHARES
    
 
                                ONE SOURCE LOGO
 
                                  COMMON STOCK
 
                            ------------------------
 
                                   PROSPECTUS
                                            , 1999
 
                            ------------------------
                            WILLIAM BLAIR & COMPANY
 
   
                           U.S. BANCORP PIPER JAFFRAY
    
                          ADAMS, HARKNESS & HILL, INC.
 
- ------------------------------------------------------
- ------------------------------------------------------
<PAGE>   93
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 13.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
     Estimated expenses payable in connection with the sale of the common stock
in this offering are as follows:
 
   
<TABLE>
<S>                                                           <C>
SEC registration fee........................................  $ 13,949
NASD filing fee.............................................     4,550
Nasdaq National Market listing fee..........................    49,000
Printing and engraving expenses.............................   125,000
Legal fees and expenses.....................................   270,000
Accounting fees and expenses................................   275,000
Transfer agent and registrar fees and expenses..............     4,450
Miscellaneous...............................................     8,051
                                                              --------
     Total..................................................  $750,000
                                                              ========
</TABLE>
    
 
- ------------
 
   
     OneSource will bear all of the expenses shown above.
    
 
ITEM 14.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.
 
     The Delaware General Corporation Law, the Company's charter and by-laws
provide for indemnification of the Company's directors and officers for
liabilities and expenses that they may incur in such capacities. In general,
directors and officers are indemnified with respect to actions taken in good
faith in a manner reasonably believed to be in, or not opposed to, the best
interests of the Company, and with respect to any criminal action or proceeding,
actions that the indemnitee had no reasonable cause to believe were unlawful.
Reference is made to the Company's corporate charter and by-laws filed as
Exhibits 3.01 and 3.02 hereto, respectively.
 
     The Underwriting Agreement provides that the Underwriters are obligated,
under certain circumstances, to indemnify directors, officers and controlling
persons of the Company against certain liabilities, including liabilities under
the Securities Act. Reference is made to the form of Underwriting Agreement
filed as Exhibit 1.01 hereto.
 
     The Company intends to apply for a directors' and officers' insurance
policy.
 
ITEM 15.  RECENT SALES OF UNREGISTERED SECURITIES.
 
     In the three years preceding the filing of this registration statement, the
Company has issued the following securities that were not registered under the
Securities Act:
 
   
     Since January 1, 1996, the Company has issued options to purchase an
aggregate of 2,163,408 shares of common stock under the 1993 Plan, exercisable
at a weighted average price of $3.09 per share. From January 1, 1996 through
December 31, 1998, options to purchase 211,217 shares had been exercised. The
following table lists options granted between January 1, 1996 and March 1, 1999.
    
 
   
<TABLE>
<CAPTION>
                            DATE                              SHARES     PRICE
                            ----                              -------    -----
<S>                                                           <C>        <C>
November 12, 1996...........................................  693,325    $1.37
November 12, 1996...........................................  569,800     2.19
April 17, 1997..............................................    1,221     1.37
July 17, 1997...............................................    2,035     1.37
</TABLE>
    
 
                                      II-1
<PAGE>   94
 
   
<TABLE>
<CAPTION>
    DATE                                                      SHARES     PRICE
    ----                                                      -------    -----
<S>                                                           <C>        <C>
October 16, 1997............................................    2,035     1.37
November 12, 1997...........................................   16,280     1.37
November 17, 1997...........................................  142,450     1.37
November 17, 1997...........................................  130,240     2.19
May 6, 1998.................................................    1,832     1.37
May 6, 1998.................................................  203,093     2.19
February 26, 1999...........................................   40,700     2.19
February 26, 1999...........................................   30,525     5.90
February 26, 1999...........................................  329,874     9.93
</TABLE>
    
 
     No underwriters were involved in the foregoing sales of securities. Such
sales were made in reliance upon the exemption provided by Section 4(2) of the
Securities Act for transactions not involving a public offering and/or Rule 701
under the Securities Act.
 
ITEM 16.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.
 
  (a) EXHIBITS:
 
   
<TABLE>
<CAPTION>
    EXHIBIT
      NO.                               EXHIBIT
    -------                             -------
    <C>       <S>
     1.01     Form of Underwriting Agreement
     3.01     Form of Second Amended and Restated Certificate of
              Incorporation of the Company
     3.02+    Amended and Restated Certificate of Incorporation of the
              Company
     3.03+    By-laws, as amended and restated, of the Company
     3.04     Second Amended and Restated By-Laws of the Company
     3.05     Amendment to Amended and Restated Certificate of
              Incorporation
     4.01     Specimen certificate representing the common stock
     5.01     Opinion of Testa, Hurwitz & Thibeault, LLP
    10.01+    1993 Stock Purchase and Option Plan
    10.02     1999 Stock Option and Incentive Plan
    10.03     1999 Employee Stock Purchase Plan
    10.04+    Registration Agreement dated September 8, 1993
    10.05+    Stock Purchase Warrant issued to Lotus Development
              Corporation dated September 8, 1993
    10.06+    Warrant Agreement with Silicon Valley Bank dated September
              8, 1993
    10.07+    Subordinated Promissory Note issued to Lotus Development
              Corporation dated September 8, 1993
    10.08+    Stock Purchase Agreement dated September 8, 1993
    10.09+    Form of Management Stock Purchase Agreement
    10.10+    Stock Purchase Agreement dated August 3, 1993, by and among
              Lotus Development Corporation, Datext, Inc. and Datext
              Holding Corporation
    10.11+    Lease dated July 1, 1998 by and between OneSource and
              CambridgePark Two Limited Partnership
    10.12+    Lease dated January 20, 1999 by and between OneSource and
              300 Baker Avenue Associates, Limited Partnership
    10.13+    Agreement and Plan of Merger dated February 26, 1999 by and
              between OneSource Information Services, Inc. and OneSource
              Holding Corporation
    10.14     Stockholders Agreement dated September 8, 1993
    10.15     Amendment No. 1 to Stockholders Agreement dated April 21,
              1999
</TABLE>
    
 
                                      II-2
<PAGE>   95
 
   
<TABLE>
<CAPTION>
    EXHIBIT
      NO.                               EXHIBIT
    -------                             -------
    <C>       <S>
    10.16     Form of Fee Termination Agreement
    10.17     Stock Redemption Agreement dated April 21, 1999
    21.01+    Subsidiaries of the Company
    23.01     Consent of Testa, Hurwitz & Thibeault, LLP (included in
              Exhibit 5.01)
    23.02     Consent of PricewaterhouseCoopers LLP
    23.03     Consent from Simba Information Inc.
    24.01+    Power of Attorney
    27.01     Financial Data Schedule as of December 31, 1998
    27.02     Financial Data Schedule as of March 31, 1999
</TABLE>
    
 
   
- ------------
    
   
+ previously filed
    
 
  (b) FINANCIAL STATEMENT SCHEDULES:
 
     Schedule II -- Valuation and Qualifying Accounts
 
     All other schedules for which provision is made in the applicable
accounting regulations of the Securities and Exchange Commission are either not
applicable or the required information is included in the Consolidated Financial
Statements and Notes thereto, and therefore have been omitted.
 
ITEM 17.  UNDERTAKINGS.
 
     Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers and controlling persons of the Company
pursuant to provisions described in Item 14 above, or otherwise, the Company has
been advised that in the opinion of the Securities and Exchange Commission such
indemnification is against public policy as expressed in the Securities Act and
is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the Company of expenses
incurred or paid by a director, officer or controlling person of the Company in
the successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the Company will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Securities Act and will be governed by the final
adjudication of such issue.
 
     The Company hereby undertakes: (1) to provide to the underwriters at the
closing specified in the underwriting agreement, certificates in such
denominations and registered in such names as required by the underwriters to
permit prompt delivery to each purchaser; (2) that for purposes of determining
any liability under the Securities Act, the information omitted from the form of
prospectus filed as part of a registration statement in reliance upon Rule 430A
and contained in the form of prospectus filed by the registrant pursuant to Rule
424(b)(1) or (4) or 497(h) under the Securities Act shall be deemed to be part
of this registration statement as of the time it was declared effective; and (3)
that for the purpose of determining any liability under the Securities Act, each
post-effective amendment that contains a form of prospectus shall be deemed to
be a new registration statement relating to the securities offered therein, and
the offering of such securities at that time shall be deemed to be the initial
bona fide offering thereof.
 
                                      II-3
<PAGE>   96
 
                                   SIGNATURES
 
   
     Pursuant to the requirements of the Securities Act of 1933, the registrant
has duly caused this Amendment No. 1 to the registration statement to be signed
on its behalf by the undersigned, thereunto duly authorized, in Cambridge,
Massachusetts on this 21st day of April, 1999.
    
 
                                          OneSource Information Services, Inc.
 
                                          By:     /s/ DANIEL J. SCHIMMEL
                                             -----------------------------------
                                             Daniel J. Schimmel
                                             President and Chief Executive
                                             Officer
 
   
     Pursuant to the requirements of the Securities Act of 1933, this Amendment
No. 1 to the registration statement has been signed by the following persons in
the capacities and on the dates indicated.
    
 
   
<TABLE>
<CAPTION>
                SIGNATURE                                TITLE(S)                     DATE
                ---------                                --------                     ----
<S>                                         <C>                                   <C>
                                            President and Chief Executive         April 21, 1999
                                            Officer and Director (principal       
                                            executive officer)
          /s/ DANIEL J. SCHIMMEL
- ------------------------------------------
            Daniel J. Schimmel
 
                                            Vice President, Finance and           April 21, 1999
                                            Administration (principal             
                                            financial officer)
            /s/ ROY D. LANDON
- ------------------------------------------
              Roy D. Landon
 

                                                                                                                           
                    *                       Director                              April 21, 1999
- ------------------------------------------
               Martin Kahn
 

                                                                                  
                    *                       Director                              April 21, 1999
- ------------------------------------------
              David Dominik
 

                                                                                  
                    *                       Director                              April 21, 1999
- ------------------------------------------
              Gregg Newmark
    
 
   
*By: /s/ Daniel J. Schimmel
   ---------------------------------------
   Daniel J. Schimmel
   Attorney-in-Fact
</TABLE>
    
 
                                      II-4
<PAGE>   97
 
                 SCHEDULE II--VALUATION AND QUALIFYING ACCOUNTS
 
                      ONESOURCE INFORMATION SERVICES, INC.
 
<TABLE>
<CAPTION>
                                        BALANCE AT
                                       BEGINNING OF    CHARGED TO                       BALANCE AT
DESCRIPTION                               PERIOD       OPERATIONS    DEDUCTIONS(1)     END OF PERIOD
- -----------                            ------------    ----------    --------------    -------------
<S>                                    <C>             <C>           <C>               <C>
Year ended December 31, 1996
  Reserves and allowances deducted
     from asset accounts
     Allowance for doubtful
        accounts.....................    $161,000        49,000          49,000          $161,000

Year ended December 31, 1997
  Reserves and allowances deducted
     from asset accounts
     Allowance for doubtful
        accounts.....................    $161,000        72,000          23,000          $210,000

Year ended December 31, 1998
  Reserves and allowances deducted
     from asset accounts
     Allowance for doubtful
        accounts.....................    $210,000       120,000          30,000          $300,000
</TABLE>
 
- ------------
(1) Doubtful accounts written off, net of recoveries
 
                                       S-1
<PAGE>   98
 
                                 EXHIBIT INDEX
   
    
 
   
<TABLE>
<CAPTION>
    EXHIBIT
      NO.                               EXHIBIT
    -------                             -------
    <C>       <S>
     1.01     Form of Underwriting Agreement
     3.01     Form of Second Amended and Restated Certificate of
              Incorporation of the Company
     3.02+    Amended and Restated Certificate of Incorporation of the
              Company
     3.03+    By-laws, as amended and restated, of the Company
     3.04     Second Amended and Restated By-Laws of the Company
     3.05     Amendment to Amended and Restated Certificate of
              Incorporation
     4.01     Specimen certificate representing the common stock
     5.01     Opinion of Testa, Hurwitz & Thibeault, LLP
    10.01+    1993 Stock Purchase and Option Plan
    10.02     1999 Stock Option and Incentive Plan
    10.03     1999 Employee Stock Purchase Plan
    10.04+    Registration Agreement dated September 8, 1993
    10.05+    Stock Purchase Warrant issued to Lotus Development
              Corporation dated September 8, 1993
    10.06+    Warrant Agreement with Silicon Valley Bank dated September
              8, 1993
    10.07+    Subordinated Promissory Note issued to Lotus Development
              Corporation dated September 8, 1993
    10.08+    Stock Purchase Agreement dated September 8, 1993
    10.09+    Form of Management Stock Purchase Agreement
    10.10+    Stock Purchase Agreement dated August 3, 1993, by and among
              Lotus Development Corporation, Datext, Inc. and Datext
              Holding Corporation
    10.11+    Lease dated July 1, 1998 by and between OneSource and
              CambridgePark Two Limited Partnership
    10.12+    Lease dated January 20, 1999 by and between OneSource and
              300 Baker Avenue Associates, Limited Partnership
    10.13+    Agreement and Plan of Merger dated February 26, 1999 by and
              between OneSource Information Services, Inc. and OneSource
              Holding Corporation
    10.14     Stockholders Agreement dated September 8, 1993
    10.15     Amendment No. 1 to Stockholders Agreement dated April 21,
              1999
    10.16     Form of Fee Termination Agreement
    10.17     Stock Redemption Agreement dated April 21, 1999
    21.01+    Subsidiaries of the Company
    23.01     Consent of Testa, Hurwitz & Thibeault, LLP (included in
              Exhibit 5.01)
    23.02     Consent of PricewaterhouseCoopers LLP
    23.03     Consent from Simba Information Inc.
    24.01+    Power of Attorney
    27.01     Financial Data Schedule as of December 31, 1998
    27.02     Financial Data Schedule as of March 31, 1999
</TABLE>
    
 
- ------------
   
+ previously filed
    

<PAGE>   1
                                                                    EXHIBIT 1.01


                      ONESOURCE INFORMATION SERVICES, INC.
                          _____ Shares Common Stock(1)


                             UNDERWRITING AGREEMENT

                                                           _______________, 1999

William Blair & Company, L.L.C.
U.S. Bancorp Piper Jaffray Inc.
Adams, Harkness & Hill, Inc.
  As Representatives of the Several
  Underwriters Named in Schedule A
c/o William Blair & Company, L.L.C.
222 West Adams Street
Chicago, Illinois 60606

Ladies and Gentlemen:

           SECTION 1.   Introductory. OneSource Information Services, Inc., a
Delaware corporation (the "Company"), as of the First Closing Date (hereinafter
defined) but excluding the transactions contemplated hereby, will have an
authorized capital stock consisting of ______ shares of Preferred Stock, $.01
par value, of which no shares will be outstanding as of such date and ________
shares of Common Stock, $.01 par value ("Common Stock"), of which ____________
shares will be outstanding as of such date. The Company proposes to issue and
sell 1,750,000 shares of its authorized but unissued Common Stock, and certain
stockholders of the Company (collectively referred to as the "Venture Capital
Selling Stockholders" and named in Schedule B-1) propose to sell ______ shares
of the Company's issued and outstanding Common Stock to the several underwriters
("Underwriters") named in Schedule A, as it may be amended by the Pricing
Agreement (hereinafter defined), who are acting severally and not jointly.
Collectively, such total of ___________ shares of Common Stock proposed to be
sold by the Company and the Venture Capital Selling Stockholders is hereinafter
referred to as the "Firm Shares." In addition, the Venture Capital Selling
Stockholders and certain other stockholders of the Company (collectively
referred to as the "Management Selling Stockholders" and named in Schedule B-2,
and together with the Venture Capital Selling Stockholders being collectively
referred to as the "Selling Stockholders" propose to grant to the Underwriters
an option to purchase up to an aggregate of __________ additional shares of
Common Stock ("Option Shares") as provided in Section 5 hereof. The Firm Shares
and, to the extent such option is exercised, the Option Shares, are hereinafter
collectively referred to as the "Shares."

         You have advised the Company and the Selling Stockholders that the
Underwriters propose to make a public offering of their respective portions of
the Shares as soon as you deem advisable after the registration statement
hereinafter referred to becomes effective, if it has not yet become effective,
and the Pricing Agreement (hereinafter defined) has been executed and delivered.


- ----------------
(1)Plus an option to acquire up to __ additional shares to cover 
over-allotments.


<PAGE>   2



         Prior to the purchase and public offering of the Shares by the several
Underwriters, the Company, the Selling Stockholders and the Representatives,
acting on behalf of the several Underwriters, shall enter into an agreement
substantially in the form of Exhibit A hereto ("Pricing Agreement"). The Pricing
Agreement may take the form of an exchange of any standard form of written
telecommunication between the Company, the Selling Stockholders and the
Representatives and shall specify such applicable information as is indicated in
Exhibit A hereto. The offering of the Shares will be governed by this Agreement,
as supplemented by the Pricing Agreement. From and after the date of the
execution and delivery of the Pricing Agreement, this Agreement shall be deemed
to incorporate the Pricing Agreement.

         The Company and the Underwriters agree that up to _____ Shares to be
purchased by the Underwriters ("Reserved Shares") shall be reserved for sale by
the Underwriters to certain eligible employees and other persons, subject to the
terms of this Agreement, the Pricing Agreement, the applicable rules,
regulations and interpretations of the National Association of Securities
Dealers, Inc. ("NASD") and all other applicable laws, rules and regulations. To
the extent that such Reserved Shares are not orally confirmed for purchase by
such eligible employees and other persons by the end of the first business day
after the date of this Agreement, such Reserved Shares may be offered to the
public as part of the public offering contemplated hereby.

         The Company and each of the Selling Stockholders hereby confirm their
agreements with the Underwriters as follows:

           SECTION 2.   Representations and Warranties of the Company. The
Company represents and warrants to, and agrees with, the several Underwriters
that:

                   (a)     A registration statement on Form S-1 (File No.
         333-_______) and a related preliminary prospectus with respect to the
         Shares have been prepared and filed with the Securities and Exchange
         Commission ("Commission") by the Company in conformity with the
         requirements of the Securities Act of 1933, as amended, and the rules
         and regulations of the Commission thereunder (collectively, the "1933
         Act;" unless indicated to the contrary, all references herein to
         specific rules are rules promulgated under the 1933 Act); and the
         Company has so prepared and has filed such amendments thereto, if any,
         and such amended preliminary prospectuses as may have been required to
         the date hereof and will file such additional amendments thereto and
         such amended prospectuses as may hereafter be required. There have been
         or will promptly be delivered to you three signed copies of such
         registration statement and amendments, three copies of each exhibit
         filed therewith, and conformed copies of such registration statement
         and amendments (but without exhibits) and copies of the related
         preliminary prospectus or prospectuses and final forms of prospectus
         for each of the Underwriters.

                           Such registration statement (as amended, if
         applicable) at the time it becomes effective and the prospectus
         constituting a part thereof at such time (including the information, if
         any, deemed to be part thereof pursuant to Rule 430A(b) and/or Rule
         434),

                                        2


<PAGE>   3



         as from time to time amended or supplemented, are hereinafter referred
         to as the "Registration Statement," and the "Prospectus," respectively,
         except that if any revised prospectus shall be provided to the
         Underwriters by the Company for use in connection with the offering of
         the Shares which differs from the Prospectus on file at the Commission
         at the time the Registration Statement became or becomes effective
         (whether or not such revised prospectus is required to be filed by the
         Company pursuant to Rule 424(b)), the term Prospectus shall refer to
         such revised prospectus from and after the time it was provided to the
         Underwriters for such use. If the Company elects to rely on Rule 434 of
         the 1933 Act, all references to "Prospectus" shall be deemed to
         include, without limitation, the form of prospectus and the term sheet,
         taken together, provided to the Underwriters by the Company in
         accordance with Rule 434 ("Rule 434 Prospectus"). Any registration
         statement (including any amendment or supplement thereto or information
         which is deemed part thereof) filed by the Company under Rule 462(b)
         ("Rule 462(b) Registration Statement") shall be deemed to be part of
         the "Registration Statement" as defined herein, and any prospectus
         (including any amendment or supplement thereto or information which is
         deemed part thereof) included in such registration statement shall be
         deemed to be part of the "Prospectus" as defined herein, as
         appropriate. The Securities Exchange Act of 1934, as amended, and the
         rules and regulations of the Commission thereunder are hereinafter
         collectively referred to as the "Exchange Act."

                   (b)     The Commission has not issued any order preventing or
         suspending the use of any preliminary prospectus, and each preliminary
         prospectus has conformed in all material respects with the requirements
         of the 1933 Act and, as of its date, did not include any untrue
         statement of a material fact or omit to state a material fact necessary
         in order to make the statements therein, in light of the circumstances
         in which they were made, not misleading; and when the Registration
         Statement became or becomes effective, and at all times subsequent
         thereto, up to the First Closing Date or the Second Closing Date (as
         such terms are hereinafter defined), as the case may be, the
         Registration Statement, including the information deemed to be part of
         the Registration Statement at the time of effectiveness pursuant to
         Rule 430A(b), if applicable, and the Prospectus and any amendments or
         supplements thereto, contained or will contain all statements that are
         required to be stated therein in accordance with the 1933 Act and in
         all material respects conformed or will in all material respects
         conform to the requirements of the 1933 Act, and neither the
         Registration Statement nor the Prospectus, nor any amendment or
         supplement thereto, included or will include any untrue statement of a
         material fact or omitted or will omit to state a material fact required
         to be stated therein or necessary in order to make the statements
         therein not misleading; provided, however, that the Company makes no
         representation or warranty as to information contained in or omitted
         from any preliminary prospectus, the Registration Statement, the
         Prospectus or any such amendment or supplement in reliance upon and in
         conformity with written information furnished to the Company by or on
         behalf of any Underwriter through the Representatives specifically for
         use in the preparation thereof.

                  (c)(i)   The Company has been duly incorporated and is validly
         existing as a corporation in good standing under the laws of the State
         of Delaware, with corporate power and authority to own or lease its
         properties and conduct its business as described in the

                                        3


<PAGE>   4



         Prospectus; the Company is duly qualified to transact business as a
         foreign corporation under the corporation law of, and is in good
         standing as such in, each jurisdiction where the ownership or leasing
         of property, having an office or the conduct of its business requires
         such qualification, except in any such case where the failure to so
         qualify or be in good standing would not have a material adverse effect
         upon the condition (financial or otherwise) or results of operations of
         the Company and its subsidiary, OneSource Information Services Limited
         ("OneSource U.K."), taken as a whole (a "Material Adverse Effect"); and
         no proceeding of which the Company has knowledge has been instituted in
         any such jurisdiction, revoking, limiting or curtailing, or seeking to
         revoke, limit or curtail, such power and authority, qualification or
         good standing.

                  (ii)     The Merger Agreement (the "Merger Agreement") between
         the Company and its prior wholly owned subsidiary, OneSource
         Information Services, Inc. (the "Operating Subsidiary"), has been duly
         authorized, executed and delivered by all parties thereto, and
         constitutes the legal, valid and binding obligation of each of the
         parties thereto, enforceable in accordance with its terms. The closing
         under the Merger Agreement has occurred in accordance with its terms,
         the certificate of merger relating thereto has been duly filed with the
         State of Delaware, and all of the business and assets previously held
         by the Operating Subsidiary have been transferred to the Company. As
         used in Sections 2(c)(i), (k), (s), (t), (u) and (v), the term
         "Company" shall mean (i) the Company and (ii) with respect to any
         period or portion thereof prior to the consummation of the Merger
         Agreement, the Operating Subsidiary.

                 (iii)     OneSource U.K. has been duly incorporated and is
         validly existing as a corporation in good standing under the laws of
         the United Kingdom, with corporate power and authority to own or lease
         its properties and conduct its business as described in the Prospectus;
         OneSource U.K. is duly qualified to transact business as a foreign
         corporation under the corporation law of, and is in good standing as
         such in, each jurisdiction where the ownership or leasing of property,
         having an office, or the conduct of its business requires such
         qualification, except in any such case where the failure to so qualify
         or be in good standing would not have a Material Adverse Effect; and no
         proceeding of which the Company has knowledge has been instituted in
         any such jurisdiction, revoking, limiting or curtailing, or seeking to
         revoke, limit or curtail, such power and authority, qualification or
         good standing.

                  (d)      Except as disclosed in the Registration Statement,
         the Company owns directly 100 percent of the issued and outstanding
         capital stock of OneSource U.K., free and clear of any claims, liens,
         encumbrances or security interests and all of such capital stock has
         been duly authorized and validly issued and is fully paid and
         nonassessable. The Company does not own any capital stock or other
         equity securities or interests in any entity other than OneSource U.K.

                  (e)      The issued and outstanding shares of each class of
         capital stock of the Company as set forth in the Prospectus under the
         caption "Capitalization" have been duly authorized and validly issued,
         are fully paid and nonassessable, and conform to the description

                                        4


<PAGE>   5



         thereof contained in the Prospectus, and, except as disclosed in the
         Prospectus, there are no options, rights or warrants for the purchase
         from the Company of Common Stock, or securities convertible into Common
         Stock, and there are no agreements to which the Company is a party with
         respect thereto.

                  (f)      The Shares to be sold by the Company have been duly
         authorized and when issued and delivered by the Company and paid for by
         the Underwriters pursuant to this Agreement, will be validly issued,
         fully paid and nonassessable, and will conform to the description
         thereof contained in the Prospectus.

                  (g)      The execution, delivery and performance by the
         Company of this Agreement and the Pricing Agreement have been duly
         authorized by all necessary corporate action and will not violate any
         provision of the Company's charter or bylaws and will not conflict
         with, constitute a breach of, or default under, or violate any
         provision of any agreement, franchise, license, indenture, mortgage,
         deed of trust, or other instrument to which the Company or OneSource
         U.K. is a party or by which the Company or OneSource U.K. is or may be
         bound or to which the property or assets of either of them is subject,
         or any statute, law, rule, regulation, ruling, judgment, injunction,
         order or decree applicable to the Company or OneSource U.K. or to
         either of their respective properties or assets. No consent, approval,
         authorization or other order of, or filing or registration with, any
         court, regulatory body, administrative agency or other governmental
         body is required for the execution and delivery of this Agreement or
         the Pricing Agreement by the Company or the consummation by the Company
         of the transactions contemplated herein or therein, except for
         compliance with the 1933 Act and blue sky laws applicable to the public
         offering of the Shares by the several Underwriters and clearance of
         such offering with the NASD. This Agreement has been duly executed and
         delivered by the Company.

                  (h)      The accountants who have expressed their opinions
         with respect to certain of the financial statements and schedules
         included in the Registration Statement are independent accountants as
         required by the 1933 Act.

                  (i)      The consolidated financial statements and schedule of
         the Company included in the Registration Statement present fairly the
         consolidated financial position of the Company as of the respective
         dates of such financial statements, and the consolidated statements of
         operations, changes in stockholders' deficit and cash flows of the
         Company for the respective periods covered thereby, all in conformity
         with generally accepted accounting principles consistently applied
         throughout the periods involved, except as disclosed in the Prospectus;
         and the supporting schedule included in the Registration Statement
         presents fairly the information required to be stated therein. The
         financial information set forth in the Prospectus under "Selected
         Consolidated Financial Data" presents fairly on the basis stated in the
         Prospectus, the information set forth therein.

                  (j)      Neither the Company nor OneSource U.K. is in
         violation of its charter or in default under any consent decree, or in
         default with respect to any material provision of any lease, loan
         agreement, franchise, license, permit or other contract obligation to
         which it is a

                                        5


<PAGE>   6



         party; and there does not exist any state of facts which constitutes an
         event of default as defined in such documents or which, with notice or
         lapse of time or both, would constitute such an event of default, in
         each case, except for defaults which neither singly nor in the
         aggregate would have a Material Adverse Effect.

                  (k)      There are no material legal or governmental
         proceedings or investigations pending, or to the Company's knowledge,
         threatened to which the Company or OneSource U.K. is or may be a party
         or of which material property owned or leased by the Company or
         OneSource U.K. is or may be the subject, or related to environmental or
         discrimination matters which are not disclosed in the Prospectus, or
         which question the validity of this Agreement or the Pricing Agreement
         or any action taken or to be taken pursuant hereto or thereto.

                  (l)      There are no holders of securities of the Company
         having preemptive rights to purchase Common Stock. All holders of
         registration rights are participating as Selling Stockholders (and with
         respect to the amount of Shares agreed to by such holder) or have duly
         and validly waived such rights with respect to the offering being made
         by the Prospectus.

                  (m)      The Company and OneSource U.K. have good and
         marketable title to all the properties and assets reflected as owned in
         the financial statements hereinabove described (or elsewhere in the
         Prospectus), subject to no claim, lien, mortgage, pledge, charge or
         encumbrance of any kind except those, if any, reflected in such
         financial statements (or elsewhere in the Prospectus) or which would
         not have a Material Adverse Effect. The Company and OneSource U.K. hold
         their respective leased properties which are material to the Company
         and OneSource U.K., taken as a whole, under valid and binding leases.

                  (n)      The Company has not taken and will not take, directly
         or indirectly, any action designed to or which has constituted or which
         might reasonably be expected to cause or result, under the Exchange Act
         or otherwise, in stabilization or manipulation of the price of any
         security of the Company to facilitate the sale or resale of the Shares.

                  (o)      Subsequent to the respective dates as of which
         information is given in the Registration Statement and Prospectus, and
         except as contemplated by the Prospectus, the Company and OneSource
         U.K., taken as a whole, have not incurred any material liabilities or
         obligations, direct or contingent, nor entered into any material
         transactions not in the ordinary course of business and there has not
         been any material adverse change in their condition (financial or
         otherwise) or results of operations nor any change in their capital
         stock or material change in their short-term debt or long-term debt.

                  (p)      For a period of 180 days after the date of this
         Agreement, the Company agrees not to (i) offer, pledge, sell, contract
         to sell, sell any option or contract to purchase, purchase any option
         or contract to sell, grant any option, right or warrant for the sale
         of, or otherwise dispose of or transfer any shares of Common Stock or
         any securities convertible into or

                                        6


<PAGE>   7



         exchangeable or exercisable for Common Stock, or file any registration
         statement under the 1933 Act with respect to any of the foregoing or
         (ii) enter into any swap or any other agreement or transaction that
         transfers, in whole or in part, directly or indirectly, the economic
         consequence of ownership of the Common Stock, whether any such swap or
         transaction is to be settled by delivery of Common Stock or other
         securities, in cash or otherwise, without the prior written consent of
         William Blair & Company, L.L.C. Notwithstanding the prior sentence,
         after the date of this Agreement the Company may issue shares of Common
         Stock upon the exercise of options outstanding on the date hereof and
         90 days after the date of this Agreement the Company may file
         Registration Statements on Form S-8 with respect to the equity-based
         incentive plans described in the Prospectus. The Company has obtained
         similar agreements from each of its executive officers, directors and
         certain other security-holders.

                  (q)      There is no document of a character required to be
         described in the Registration Statement or the Prospectus or to be
         filed as an exhibit to the Registration Statement which is not
         described or filed as required.

                  (r)      No relationship, direct or indirect, exists between
         or among the Company or OneSource U.K., on the one hand, and the
         directors, officers, stockholders, customers or suppliers of the
         Company or OneSource U.K., on the other hand, which is required to be
         described in the Prospectus that is not so described.

                  (s)      The Company, together with OneSource U.K., owns and
         possesses all right, title and interest in and to, or has duly licensed
         from third parties, all patents, patent rights, trade secrets,
         inventions, know-how (including trade secrets and proprietary or
         confidential information), trademarks, trade names, copyrights, service
         marks and other proprietary rights ("Trade Rights") material to the
         business of the Company and OneSource U.K., as currently conducted,
         taken as a whole. Neither the Company nor OneSource U.K. has received
         any notice of infringement, misappropriation or conflict from any third
         party as to any such material Trade Rights which has not been resolved
         or disposed of and neither the Company nor OneSource U.K. has
         infringed, misappropriated or otherwise conflicted with material Trade
         Rights of any third party, which infringement, misappropriation or
         conflict would have a Material Adverse Effect.

                  (t)      The conduct of the business of each of the Company
         and OneSource U.K. is in compliance in all respects with applicable
         federal, state, local and foreign laws and regulations, except where
         the failure to be in compliance would not have a Material Adverse
         Effect.

                  (u)      All offers and sales of the Company's capital stock
         prior to the date hereof were at all relevant times exempt from the
         registration requirements of the 1933 Act and were duly registered with
         or the subject of an available exemption from the registration
         requirements of the applicable state securities or blue sky laws.

                                        7


<PAGE>   8



                  (v)      The Company has filed all necessary federal and state
         income and franchise tax returns, and OneSource U.K. has filed all
         necessary foreign tax returns, and each of the Company and OneSource
         U.K. has paid all taxes shown as due thereon, and there is no tax
         deficiency that has been, or to the knowledge of the Company might be,
         asserted against the Company or OneSource U.K. or any of their
         respective properties or assets that would or could be expected to have
         a Material Adverse Effect.

                  (w)      The Company has filed a registration statement
         pursuant to Section 12(g) of the Exchange Act to register the Common
         Stock thereunder, has filed an application to list the Common Stock
         (including the Shares) on the Nasdaq National Market, and has received
         notification that the listing has been approved, subject to notice of
         issuance or sale of the Shares, as the case may be.

                  (x)      The Company is not, and does not intend to conduct
         its business in a manner in which it would become, an "investment
         company" as defined in Section 3(a) of the Investment Company Act of
         1940, as amended ("Investment Company Act").

           SECTION 3.   Representations, Warranties and Covenants of the Selling
Stockholders.

                  (a)      Each Selling Stockholder, severally and not jointly,
         represents and warrants to, and agrees with, the Company and the
         several Underwriters that:

                           (i)      Such Selling Stockholder has, and on the
                  First Closing Date or the Second Closing Date (as such terms
                  are hereinafter defined), as the case may be, will have, valid
                  marketable title to the Shares proposed to be sold by such
                  Selling Stockholder hereunder on such date and full right,
                  power and authority to enter into this Agreement and the
                  Pricing Agreement and to sell, assign, transfer and deliver
                  such Shares hereunder, free and clear of all voting trust
                  arrangements, stockholder agreements, liens, security
                  interests, encumbrances of any kind, equities, claims and, if
                  applicable, community property rights; and upon delivery by
                  such Selling Stockholder of and payment by the Underwriters
                  for such Shares hereunder, the Underwriters will acquire (x)
                  valid marketable title to such Shares (assuming the
                  Underwriters acquire their interests in such Shares in good
                  faith and without notice of any adverse claims) and (y) such
                  Shares free and clear of all voting trust arrangements,
                  stockholder agreements, liens, security interests,
                  encumbrances of any kind, equities, claims and, if applicable,
                  community property rights.

                           (ii)     Such Selling Stockholder has not taken and
                  will not take, directly or indirectly, any action designed to
                  or which might be reasonably expected to cause or result,
                  under the Exchange Act or otherwise, in stabilization or
                  manipulation of the price of any security of the Company to
                  facilitate the sale or resale of the Shares.

                           (iii)    Such Selling Stockholder has duly executed
                  and delivered a Power of

                                        8


<PAGE>   9



                  Attorney ("Power of Attorney") among the Selling Stockholder
                  and Daniel J. Schimmel and Roy D. Landon (the "Agents"),
                  naming the Agents as such Selling Stockholder's
                  attorneys-in-fact (and, by the execution by any Agent of this
                  Agreement, such Agent hereby represents and warrants that he
                  has been duly appointed as attorney-in-fact by the Selling
                  Stockholders pursuant to the Power of Attorney) for the
                  purpose of entering into and carrying out this Agreement and
                  the Pricing Agreement, and the Power of Attorney has been duly
                  executed by such Selling Stockholder and a copy thereof has
                  been delivered to you.

                           (iv)     Such Selling Stockholder has duly executed
                  and delivered a Custody Agreement ("Custody Agreement") with
                  the Company, as custodian ("Custodian"), and has deposited in
                  custody under the Custody Agreement certificates in negotiable
                  form for the Shares to be sold hereunder by such Selling
                  Stockholder, for the purpose of further delivery pursuant to
                  this Agreement. Such Selling Stockholder agrees that the
                  Shares to be sold by such Selling Stockholder on deposit with
                  the Custodian are subject to the interests of the Company, the
                  Underwriters and the other Selling Stockholders, that the
                  arrangements made for such custody, and the appointment of the
                  Agents pursuant to the Power of Attorney, are to that extent
                  irrevocable, and that the obligations of such Selling
                  Stockholder hereunder and under the Power of Attorney and the
                  Custody Agreement shall not be terminated (except as provided
                  in this Agreement, the Power of Attorney or the Custody
                  Agreement) by any act of such Selling Stockholder, by
                  operation of law, whether, in the case of an individual
                  Selling Stockholder, by the death or incapacity of such
                  Selling Stockholder or, in the case of a trust or estate, by
                  the death of the trustee or trustees or the executor or
                  executors or the termination of such trust or estate, or, in
                  the case of a partnership or corporation, by the dissolution,
                  winding-up or other event affecting the legal life of such
                  entity, or by the occurrence of any other event. If any
                  individual Selling Stockholder, trustee or executor should die
                  or become incapacitated, or any such trust, estate,
                  partnership or corporation should be terminated, or if any
                  other event should occur before the delivery of the Shares
                  hereunder, the documents evidencing Shares then on deposit
                  with the Custodian shall be delivered by the Custodian in
                  accordance with the terms and conditions of this Agreement as
                  if such death, incapacity, termination or other event had not
                  occurred, regardless of whether or not the Custodian shall
                  have received notice thereof. Each Agent has been authorized
                  by such Selling Stockholder to execute and deliver this
                  Agreement and the Pricing Agreement and the Custodian has been
                  authorized to receive and acknowledge receipt of the proceeds
                  of sale of the Shares to be sold by such Selling Stockholder
                  against delivery thereof and otherwise act on behalf of such
                  Selling Stockholder. A copy of the Custody Agreement has been
                  delivered to you.

                           (v)      The execution, delivery and performance by
                  or on behalf of such Selling Stockholder of this Agreement,
                  the Pricing Agreement, the Power of Attorney and the Custody
                  Agreement will not conflict with, constitute a breach of, or
                  default under, or violate any provision of any agreement,
                  franchise, license, indenture, mortgage, deed of trust, or
                  other instrument to which such Selling Stockholder is a

                                        9


<PAGE>   10



                  party or by which such Selling Stockholder is or may be bound
                  or to which such Selling Stockholder's property or assets is
                  subject, or any statute, law, rule, regulation, ruling,
                  judgment, injunction, order or decree applicable to such
                  Selling Stockholder or to such Selling Stockholder's property
                  or assets. No consent, approval, authorization or other order
                  of, or filing or registration with, any court, regulatory
                  body, administrative agency or other governmental body is
                  required for the execution and delivery of this Agreement, the
                  Pricing Agreement, the Power of Attorney or the Custody
                  Agreement by or on behalf of such Selling Stockholder or the
                  consummation by or on behalf of such Selling Stockholder of
                  the transactions contemplated herein or therein, except for
                  compliance with the 1933 Act and blue sky laws applicable to
                  the public offering of the Shares by the several Underwriters
                  and clearance of such offering with the NASD. This Agreement
                  has been duly executed and delivered by or on behalf of such
                  Selling Stockholder.

                           (vi)     Each preliminary prospectus, insofar as it
                  has related to such Selling Stockholder, as of its date, has
                  conformed in all material respects with the requirements of
                  the 1933 Act and, as of its date, did not include any untrue
                  statement of a material fact or omit to state a material fact
                  necessary in order to make the statements therein, in light of
                  the circumstances in which they were made, not misleading; and
                  when the Registration Statement became or becomes effective,
                  and at all times subsequent thereto, up to the First Closing
                  Date or the Second Closing Date, as the case may be, (1) the
                  Registration Statement and the Prospectus, and any amendments
                  or supplements thereto, insofar as they relate to such Selling
                  Stockholder, contained or will contain all statements that are
                  required to be stated therein in accordance with the 1933 Act
                  and in all material respects conformed or will in all material
                  respects conform to the requirements of the 1933 Act and (2)
                  neither the Registration Statement nor the Prospectus, nor any
                  amendment or supplement thereto, as it relates to such Selling
                  Stockholder, included or will include any untrue statement of
                  a material fact or omitted or will omit to state any material
                  fact required to be stated therein or necessary in order to
                  make the statements therein not misleading; provided that
                  neither of clauses (1) or (2) shall have any effect if
                  information has been given by such Selling Stockholder to the
                  Company and the Representatives in writing which would
                  eliminate or remedy any such untrue statement or omission.

                  (b)      For a period of 180 days after the date of this
         Agreement, such Selling Stockholder agrees not to (i) offer, pledge,
         sell, contract to sell, sell any option or contract to purchase,
         purchase any option or contract to sell, grant any option, right or
         warrant for the sale of, or otherwise dispose of or transfer any shares
         of Common Stock or any securities convertible into or exchangeable or
         exercisable for Common Stock, or file any registration statement under
         the 1933 Act with respect to any of the foregoing or (ii) enter into
         any swap or any other agreement or transaction that transfers, in whole
         or in part, directly or indirectly, the economic consequence of
         ownership of the Common Stock, whether any such swap or transaction is
         to be settled by delivery of Common Stock or other securities, in cash
         or

                                       10


<PAGE>   11



         otherwise, without the prior written consent of William Blair &
         Company, L.L.C., except for the Shares to be sold pursuant to this
         Agreement.

                  (c)(i)   Each Management Selling Stockholder, severally and
         not jointly, represents and warrants to, and agrees with, the several
         Underwriters that the representations and warranties of the Company set
         forth in Section 2 of this Agreement are true and correct.

                  (ii)     Each Venture Capital Selling Stockholder has no
         reason to believe that the representations and warranties of the
         Company set forth in Section 2 of this Agreement are not true and
         correct.

                  (d)      In order to document the Underwriter's compliance
         with the reporting and withholding provisions of the Internal Revenue
         Code of 1986, as amended, with respect to the transactions herein
         contemplated, each of the Selling Stockholders agrees to deliver to you
         prior to or on the First Closing Date a properly completed and executed
         United States Treasury Department Form W-8 or W-9 (or other applicable
         form of statement specified by Treasury Department regulations in lieu
         thereof).

           SECTION 4.   Representations and Warranties of the Underwriters.
The Representatives, on behalf of the several Underwriters, represent and
warrant to the Company and the Selling Stockholders that the information set
forth (a) on the cover page of the Prospectus with respect to price,
underwriting discount and terms of the offering and (b) in paragraphs 1, 2, 3,
4, 5, 9, 10, 12, 14 and 15 (except for the third sentence of such paragraph 15)
under "Underwriting" in the Prospectus was furnished to the Company by and on
behalf of the Underwriters for use in connection with the preparation of the
Registration Statement and is correct and complete in all material respects.

           SECTION 5.   Purchase, Sale and Delivery of Shares. On the basis of
the representations, warranties and agreements herein contained, but subject to
the terms and conditions herein set forth, the Company and the Venture Capital
Selling Stockholders, severally and not jointly, agree to sell to the
Underwriters named in Schedule A hereto, and the Underwriters agree, severally
and not jointly, to purchase from the Company and the Venture Capital Selling
Stockholders, respectively, _________ Firm Shares from the Company and the
respective number of Firm Shares set forth opposite the names of the Venture
Capital Selling Stockholders in Schedule B-1 hereto at the price per share set
forth in the Pricing Agreement. The obligation of each Underwriter to the
Company shall be to purchase from the Company that number of full shares which
(as nearly as practicable, as determined by you) bears to the number of Firm
Shares to be sold by the Company, the same proportion as the number of Shares
set forth opposite the name of such Underwriter in Schedule A hereto bears to
the total number of Firm Shares to be purchased by all Underwriters under this
Agreement. The obligation of each Underwriter to each Venture Capital Selling
Stockholder shall be to purchase from such Venture Capital Selling Stockholder
the number of full shares which (as nearly as practicable, as determined by you)
bears to that number of Firm Shares set forth opposite the name of such Venture
Capital Selling Stockholder in Schedule B-1 hereto, the same proportion as the
number of Shares set forth opposite the name of such Underwriter in Schedule A
hereto bears to the total number of Firm Shares to be purchased by all
Underwriters under this Agreement. The initial public offering price and the
purchase price shall be set forth in the Pricing Agreement.

                                       11


<PAGE>   12



         At 9:00 A.M., Chicago Time, on the fourth business day, if permitted
under Rule 15c6-1 under the Exchange Act (or the third business day if required
under Rule 15c6-1 under the Exchange Act or unless postponed in accordance with
the provisions of Section 12), following the date the Registration Statement
becomes effective (or, if the Company has elected to rely upon Rule 430A, the
fourth business day, if permitted under Rule 15c6-1 under the Exchange Act (or
the third business day if required under Rule 15c6-1 under the Exchange Act),
after execution of the Pricing Agreement), or such other time not later than ten
business days after such date as shall be agreed upon by the Representatives and
the Company, the Company and the Custodian will deliver to you at the offices of
counsel for the Company or through the facilities of The Depository Trust
Company for the accounts of the several Underwriters, certificates representing
the Firm Shares to be sold by them, respectively, against payment of the
purchase price therefor by delivery of federal or other immediately available
funds, by wire transfer or otherwise, to the Company and the Custodian. Such
time of delivery and payment is herein referred to as the "First Closing Date."
The certificates for the Firm Shares so to be delivered will be in such
denominations and registered in such names as you request by notice to the
Company and the Custodian prior to 10:00 A.M., Chicago Time, on the second
business day preceding the First Closing Date, and will be made available at the
Company's expense for checking and packaging by the Representatives at 10:00
A.M., Chicago Time, on the business day preceding the First Closing Date.
Payment for the Firm Shares so to be delivered shall be made at the time and in
the manner described above at the offices of counsel for the Company.

         In addition, on the basis of the representations, warranties and
agreements herein contained, but subject to the terms and conditions herein set
forth, the Selling Stockholders hereby grant an option to the several
Underwriters to purchase, severally and not jointly, up to an aggregate of
_______ Option Shares, at the same purchase price per share to be paid for the
Firm Shares, for use solely in covering any over-allotments made by the
Underwriters in the sale and distribution of the Firm Shares. The option granted
hereunder may be exercised at any time (but not more than once) within 30 days
after the date of the initial public offering upon notice by you to the Company
and the Agents setting forth the aggregate number of Option Shares as to which
the Underwriters are exercising the option, the names and denominations in which
the certificates for such shares are to be registered and the time and place at
which such certificates will be delivered. Such time of delivery (which may not
be earlier than the First Closing Date), being herein referred to as the "Second
Closing Date," shall be determined by you, but if at any time other than the
First Closing Date, shall not be earlier than three nor later than 10 full
business days after delivery of such notice of exercise. The number of Option
Shares to be purchased from each Selling Stockholder shall be the number of
shares set forth opposite the name of such Selling Stockholder under "Number of
Option Shares to be Sold" in Schedules B-1 and B-2 hereto. If less than all
Option Shares are to be purchased, the number of Option Shares to be purchased
from the Selling Stockholders shall be reduced pro rata. The number of Option
Shares to be purchased by each Underwriter shall be determined by multiplying
the number of Option Shares to be sold by the Selling Stockholders pursuant to
such notice of exercise by a fraction, the numerator of which is the number of
Firm Shares to be purchased by such Underwriter as set forth opposite its name
in Schedule A and the denominator of which is the total number of Firm Shares
(subject to such adjustments to eliminate any fractional share purchases as you
in your absolute discretion may make). Certificates for the Option Shares will
be made available at the Company's expense for checking and packaging at 10:00
A.M., Chicago Time, on the business

                                       12


<PAGE>   13



day preceding the Second Closing Date. The manner of payment for and delivery of
the Option Shares shall be the same as for the Firm Shares as specified in the
preceding paragraph.

         You have advised the Company and the Selling Stockholders that each
Underwriter has authorized you to accept delivery of its Shares, to make payment
and to receipt therefor. You, individually and not as the Representatives of the
Underwriters, may make payment for any Shares to be purchased by any Underwriter
whose funds shall not have been received by you by the First Closing Date or the
Second Closing Date, as the case may be, for the account of such Underwriter,
but any such payment shall not relieve such Underwriter from any obligation
hereunder.

         The Company hereby confirms its engagement of U.S. Bancorp Piper
Jaffray Inc. as, and U.S. Bancorp Piper Jaffray Inc. hereby confirms its
agreement with the Company to render services as, a "qualified independent
underwriter" within the meaning of Rule 2720 of the Conduct Rules of the NASD
with respect to the offering and sale of the Shares. U.S. Bancorp Piper Jaffray
Inc., solely in its capacity as qualified independent underwriter and not
otherwise, is referred to herein as the "Independent Underwriter."

         All references to the Independent Underwriter in the Registration
Statement or the Prospectus or in any other filing, report, document, release or
other communication prepared, issued or transmitted in conjunction with the
offering of Shares by the Company or the Underwriters shall be subject to its
prior consent with respect to form and substance, which consent shall not be
unreasonably withheld. Each of the Company and the Underwriters will cause any
corporation controlling, controlled by or under common control with it, and any
representative or agent of the Company or the Underwriters, as the case may be,
or of any such corporation, who or which prepares, issues or transmits any
filing, report, document, release or other communication in connection with the
offering which refers to the Independent Underwriter, to obtain its prior
consent with respect to the form and substance thereof, which consent shall not
be unreasonably withheld. Notwithstanding the foregoing, counsel to the Company
or the Underwriters may, without the Independent Underwriter's prior consent,
refer to it in any correspondence with the NASD or the Commission which relates
to the transactions contemplated by this Agreement.

           SECTION 6.   Covenants of the Company. The Company covenants and 
agrees that:

                  (a)      The Company will advise you and the Selling
         Stockholders promptly of the issuance by the Commission of any stop
         order suspending the effectiveness of the Registration Statement or of
         the institution of any proceedings for that purpose, or of any
         notification of the suspension of qualification of the Shares for sale
         in any jurisdiction or the initiation or threatening of any proceedings
         for that purpose, and will also advise you and the Selling Stockholders
         promptly of any request of the Commission for any amendment to or
         supplement of the Registration Statement, any preliminary prospectus or
         the Prospectus, or for additional information.

                  (b)      The Company will give you and the Selling
         Stockholders notice of its intention to file or prepare any amendment
         to the Registration Statement (including any post-effective

                                       13


<PAGE>   14



         amendment) or any Rule 462(b) Registration Statement or any amendment
         or supplement to the Prospectus (including any revised prospectus which
         the Company proposes for use by the Underwriters in connection with the
         offering of the Shares which differs from the prospectus on file at the
         Commission at the time the Registration Statement became or becomes
         effective, whether or not such revised prospectus is required to be
         filed pursuant to Rule 424(b) and any term sheet as contemplated by
         Rule 434) and will furnish you and the Selling Stockholders with copies
         of any such amendment or supplement a reasonable amount of time prior
         to such proposed filing or use, as the case may be, and will not file
         any such amendment or supplement or use any such prospectus to which
         you or counsel for the Underwriters shall reasonably object.

                  (c)      If the Company elects to rely on Rule 434 of the 1933
         Act, the Company will prepare a term sheet that complies with the
         requirements of Rule 434. If the Company elects not to rely on Rule
         434, the Company will provide the Underwriters with copies of the form
         of prospectus, in such numbers as the Underwriters may reasonably
         request, and file with the Commission such prospectus in accordance
         with Rule 424(b) of the 1933 Act by the close of business in New York
         City on the second business day immediately succeeding the date of the
         Pricing Agreement. If the Company elects to rely on Rule 434, the
         Company will provide the Underwriters with copies of the form of Rule
         434 Prospectus, in such numbers as the Underwriters may reasonably
         request, by the close of business in New York on the business day
         immediately succeeding the date of the Pricing Agreement.

                  (d)      If at any time when a prospectus relating to the
         Shares is required to be delivered under the 1933 Act any event occurs
         as a result of which the Prospectus, including any amendments or
         supplements, would include an untrue statement of a material fact, or
         omit to state any material fact required to be stated therein or
         necessary in order to make the statements therein, in the light of the
         circumstances in which they were made, not misleading, or if it is
         necessary at any time to amend the Prospectus, including any amendments
         or supplements thereto and including any revised prospectus which the
         Company proposes for use by the Underwriters in connection with the
         offering of the Shares which differs from the prospectus on file with
         the Commission at the time of effectiveness of the Registration
         Statement, whether or not such revised prospectus is required to be
         filed pursuant to Rule 424(b) to comply with the 1933 Act, the Company
         promptly will advise you thereof and will promptly prepare and file
         with the Commission an amendment or supplement which will correct such
         statement or omission or an amendment which will effect such
         compliance; and, in case any Underwriter is required to deliver a
         prospectus nine months or more after the effective date of the
         Registration Statement, the Company upon request, but at the expense of
         such Underwriter, will prepare promptly such prospectus or prospectuses
         as may be necessary to permit compliance with the requirements of
         Section 10(a)(3) of the 1933 Act.

                  (e)      Neither the Company nor any of its subsidiaries will,
         prior to the earlier of the Second Closing Date or termination or
         expiration of the related option, incur any liability or obligation,
         direct or contingent, or enter into any material transaction, other
         than in the ordinary course of business, except as contemplated by the
         Prospectus.

                                       14


<PAGE>   15



                  (f)      Neither the Company nor any of its subsidiaries will
         acquire any capital stock of the Company prior to the earlier of the
         Second Closing Date or termination or expiration of the related option
         nor will the Company declare or pay any dividend or make any other
         distribution upon the Common Stock payable to stockholders of record on
         a date prior to the earlier of the Second Closing Date or termination
         or expiration of the related option, except in either case as
         contemplated by the Prospectus.

                  (g)      Not later than the 45th day following the end of the
         fiscal quarter first occurring after the first anniversary of the
         effective date of the Registration Statement, the Company will make
         generally available to its security holders an earnings statement
         (which need not be audited) covering a period of at least 12 months
         beginning after the effective date of the Registration Statement, which
         will satisfy the provisions of the last paragraph of Section 11(a) of
         the 1933 Act.

                  (h)      During such period as a prospectus is required by law
         to be delivered in connection with offers and sales of the Shares by an
         Underwriter or dealer, the Company will furnish to you at its expense,
         subject to the provisions of subsection (d) hereof, copies of the
         Registration Statement, the Prospectus, each preliminary prospectus and
         all amendments and supplements to any such documents in each case as
         soon as available and in such quantities as you may reasonably request,
         for the purposes contemplated by the 1933 Act.

                  (i)      The Company will cooperate with the Underwriters in
         qualifying or registering the Shares for sale under the blue sky laws
         of such jurisdictions as you designate, and will continue such
         qualifications in effect so long as reasonably required for the
         distribution of the Shares. The Company shall not be required to
         qualify as a foreign corporation or to file a general consent to
         service of process in any such jurisdiction where it is not currently
         qualified or where it would be subject to taxation as a foreign
         corporation.

                  (j)      During the period of five years hereafter, the
         Company will furnish you and each of the other Underwriters with a copy
         (i) as soon as practicable after the filing thereof, of each report
         filed by the Company with the Commission, any securities exchange or
         the NASD; (ii) as soon as practicable after the release thereof, of
         each material press release in respect of the Company; and (iii) as
         soon as available, of each report of the Company mailed to
         stockholders.

                  (k)      The Company will use the net proceeds received by it
         from the sale of the Shares being sold by it in the manner specified in
         the Prospectus.

                  (l)      If, at the time of effectiveness of the Registration
         Statement, any information shall have been omitted therefrom in
         reliance upon Rule 430A and/or Rule 434, then immediately following the
         execution of the Pricing Agreement, the Company will prepare, and file
         or transmit for filing with the Commission in accordance with such Rule
         430A, Rule 424(b) and/or Rule 434, copies of an amended Prospectus, or,
         if required by such Rule 430A and/or Rule 434, a post-effective
         amendment to the Registration Statement (including an

                                       15


<PAGE>   16



         amended Prospectus), containing all information so omitted. If
         required, the Company will prepare and file, or transmit for filing, a
         Rule 462(b) Registration Statement not later than the date of the
         execution of the Pricing Agreement. If a Rule 462(b) Registration
         Statement is filed, the Company shall make payment of, or arrange for
         payment of, the additional registration fee owing to the Commission
         required by Rule 111.

                  (m)      The Company will ensure that the Reserved Shares will
         be restricted as required by the NASD rules from sale, transfer,
         assignment, pledge or hypothecation for a period of three months
         following the date of this Agreement. The Underwriters will notify the
         Company as to which persons will need to be so restricted. At the
         request of the Underwriters, the Company will direct the transfer agent
         to place a stop transfer restriction upon such shares for such period
         of time. Should the Company release, or seek to release, from such
         restrictions any of the Reserved Shares, the Company agrees to
         reimburse the Underwriters for any reasonable expenses (including,
         without limitation, legal expenses) they incur in connection with such
         release.

                  (n)      Prior to the First Closing Date, the Company will (i)
         reclassify its Class P Common Stock as described in the Prospectus and
         (ii) terminate the Stockholders Agreement dated as of September 8, 1993
         by and between the Company, William Blair Venture Partners III Limited
         Partnership, Information Partners Capital Fund, L.P., Silicon Valley
         Bank and certain other persons listed on Schedule A thereto.

           SECTION 7.   Payment of Expenses. Whether or not the transactions
contemplated hereunder are consummated or this Agreement becomes effective as to
all of its provisions or is terminated, the Company agrees to pay (i) all costs,
fees and expenses (other than legal fees and disbursements of counsel for the
Underwriters and the expenses incurred by the Underwriters) incurred in
connection with the performance of the Company's obligations hereunder,
including without limiting the generality of the foregoing, all fees and
expenses of legal counsel for the Company and of the Company's independent
accountants, all costs and expenses incurred in connection with the preparation,
printing, filing and distribution of the Registration Statement, each
preliminary prospectus and the Prospectus (including all exhibits and financial
statements) and all amendments and supplements provided for herein, this
Agreement, the Pricing Agreement and the Blue Sky Memorandum and all fees and
expenses incurred in connection with the listing of the Shares on the Nasdaq
National Market; (ii) all costs, fees and expenses (including legal fees not to
exceed $10,000 and disbursements of counsel for the Underwriters) incurred by
the Underwriters in connection with qualifying or registering all or any part of
the Shares for offer and sale under blue sky laws, including the preparation of
a blue sky memorandum relating to the Shares and clearance of such offering with
the NASD, and in connection with matters related to the Independent Underwriter;
and (iii) all fees and expenses of the Company's transfer agent, printing of the
certificates for the Shares and all transfer taxes, if any, with respect to the
sale and delivery of the Shares to the several Underwriters.

         The provisions of this Section shall not affect any agreement which the
Company and the Selling Stockholders may make for the allocation or sharing of
such expenses and costs.

                                       16


<PAGE>   17



           SECTION 8.   Conditions of the Obligations of the Underwriters. The
obligations of the several Underwriters to purchase and pay for the Firm Shares
on the First Closing Date and the Option Shares on the Second Closing Date shall
be subject to the accuracy of the representations and warranties on the part of
the Company and the Selling Stockholders herein set forth as of the date hereof
and as of the First Closing Date or the Second Closing Date, as the case may be,
to the accuracy of the statements of officers of the Company made pursuant to
the provisions hereof, to the performance by the Company and the Selling
Stockholders of their respective obligations hereunder, and to the following
additional conditions:

                  (a)      The Registration Statement shall have become
         effective either prior to the execution of this Agreement or not later
         than 1:00 P.M., Chicago Time, on the first full business day after the
         date of this Agreement, or such later time as shall have been consented
         to by you but in no event later than 1:00 P.M., Chicago Time, on the
         third full business day following the date hereof; and prior to the
         First Closing Date or the Second Closing Date, as the case may be, no
         stop order suspending the effectiveness of the Registration Statement
         shall have been issued and no proceedings for that purpose shall have
         been instituted or shall be pending or, to the knowledge of the
         Company, the Selling Stockholders or you, shall be contemplated by the
         Commission. If the Company has elected to rely upon Rule 430A and/or
         Rule 434, the information concerning the initial public offering price
         of the Shares and price-related information shall have been transmitted
         to the Commission for filing pursuant to Rule 424(b) within the
         prescribed period and the Company will provide evidence satisfactory to
         the Representatives of such timely filing (or a post-effective
         amendment providing such information shall have been filed and declared
         effective in accordance with the requirements of Rules 430A and
         424(b)). If a Rule 462(b) Registration Statement is required, such
         Registration Statement shall have been transmitted to the Commission
         for filing and become effective within the prescribed time period and,
         prior to the First Closing Date, the Company shall have provided
         evidence of such filing and effectiveness in accordance with Rule
         462(b).

                  (b)      The Shares shall have been qualified for sale under
         the blue sky laws of such states as shall have been specified by the
         Representatives.

                  (c)      The legality and sufficiency of the authorization,
         issuance and sale or transfer and sale of the Shares hereunder, the
         validity and form of the certificates representing the Shares, the
         execution and delivery of this Agreement and the Pricing Agreement, and
         all corporate proceedings and other legal matters incident thereto, and
         the form of the Registration Statement and the Prospectus (except
         financial statements) shall have been approved by counsel for the
         Underwriters exercising reasonable judgment.

                  (d)      You shall not have advised the Company that the
         Registration Statement or the Prospectus or any amendment or supplement
         thereto, contains an untrue statement of fact, which, in the opinion of
         counsel for the Underwriters, is material or omits to state a fact
         which, in the opinion of such counsel, is material and is required to
         be stated therein or necessary to make the statements therein not
         misleading.

                  (e)      Subsequent to the execution and delivery of this
         Agreement, there shall not

                                       17


<PAGE>   18



         have occurred any change, or any development involving a prospective
         change, in or affecting particularly the business or properties of the
         Company or its subsidiaries, whether or not arising in the ordinary
         course of business, which, in the judgment of the Representatives,
         makes it impractical or inadvisable to proceed with the public offering
         or purchase of the Shares as contemplated hereby.

                  (f)      The NASD shall have confirmed that it has not raised
         any objection with respect to the fairness and reasonableness of the
         underwriting terms and arrangements.

                  (g)      There shall have been furnished to you, as
         Representatives of the Underwriters, on the First Closing Date or the
         Second Closing Date, as the case may be, except as otherwise expressly
         provided below:

                           (i)      An opinion of Testa, Hurwitz & Thibeault,
                  LLP, counsel for the Company, addressed to the Underwriters
                  and dated the First Closing Date or the Second Closing Date,
                  as the case may be, in the form attached hereto as Exhibit C.

                           (ii)     An opinion of Arnheim Tite & Lewis, counsel
                  for the Company, addressed to the Underwriters and dated the
                  First Closing Date or the Second Closing Date, as the case may
                  be, in the form attached hereto as Exhibit D.

                           (iii)    An opinion of Kirkland & Ellis, counsel for
                  the Venture Capital Selling Stockholders, addressed to the
                  Underwriters and dated the First Closing Date or the Second
                  Closing Date, as the case may be, to the effect that:

                                    (1)      each of the Power of Attorney and
                           Custody Agreement has been duly authorized, executed
                           and delivered by or on behalf of each Venture Capital
                           Selling Stockholder and constitutes a legal, valid
                           and binding agreement of such Venture Capital Selling
                           Stockholder enforceable in accordance with its terms;

                                    (2)      each of this Agreement and the
                           Pricing Agreement has been duly authorized, executed
                           and delivered by or on behalf of each Venture Capital
                           Selling Stockholder; the Agents and the Custodian for
                           such Venture Capital Selling Stockholders have been
                           duly and validly authorized to carry out all
                           transactions contemplated herein on behalf of such
                           Venture Capital Selling Stockholders; and the
                           execution and performance of this Agreement and the
                           Pricing Agreement and the consummation by such
                           Venture Capital Selling Stockholders of the
                           transactions contemplated herein and therein will not
                           result in a breach or violation of any of the terms
                           and provisions of, or constitute a default under, any
                           agreement, franchise, license, indenture, mortgage,
                           deed of trust, or other instrument known to such
                           counsel to which any such

                                       18


<PAGE>   19
                           Venture Capital Selling Stockholder is a party or by
                           which any are bound or to which any of the property
                           of any such Venture Capital Selling Stockholder is
                           subject, or violate any statute, order, rule or
                           regulation known to such counsel of any court or
                           governmental agency or body having jurisdiction over
                           any of such Venture Capital Selling Stockholders or
                           any of their properties; and no approval,
                           authorization or consent of any court or governmental
                           agency or body is required for the consummation of
                           the transactions contemplated by this Agreement and
                           the Pricing Agreement in connection with the sale of
                           Shares by such Venture Capital Selling Stockholders
                           pursuant to this Agreement, except such as have been
                           obtained under the 1933 Act and such as may be
                           required under blue sky laws applicable to the public
                           offering of the Shares by the several Underwriters
                           and the clearance of such offering with the NASD;

                                    (3)      each Venture Capital Selling
                           Stockholder has full right, power and authority to
                           enter into this Agreement and the Pricing Agreement
                           and to sell, transfer and deliver the Shares to be
                           sold on the First Closing Date or the Second Closing
                           Date, as the case may be, by such Venture Capital
                           Selling Stockholder hereunder and good and marketable
                           title to such Shares so sold, free and clear of all
                           voting trust arrangements, stockholder agreements,
                           liens, encumbrances, equities, claims and community
                           property rights whatsoever, has been transferred to
                           the Underwriters (who counsel may assume to be bona
                           fide purchasers) who have purchased such Shares
                           hereunder; and

                                    (4)      this Agreement and the Pricing
                           Agreement are legal, valid and binding agreements of
                           each Venture Capital Selling Stockholder except as
                           enforceability of the same may be limited by
                           bankruptcy, insolvency, reorganization, moratorium or
                           other similar laws affecting creditors' rights and by
                           the exercise of judicial discretion in accordance
                           with general principles applicable to equitable and
                           similar remedies and except with respect to those
                           provisions relating to indemnities for liabilities
                           arising under the 1933 Act, as to which no opinion
                           need be expressed.

                                    In rendering such opinion, such counsel may
                  state that they are relying, as to factual matters, on
                  certificates of the Venture Capital Selling Stockholders, in
                  which case their opinion is to state that they are so doing
                  and copies of said certificates are to be attached to the
                  opinion unless said certificates (or the information therein)
                  have been furnished to the Representatives in other form.

                           (iv)     An opinion of Bachner, Tally, Polevoy &
                  Misher LLP, counsel for the Management Selling Stockholders,
                  addressed to the Underwriters and dated the First Closing Date
                  or the Second Closing Date, as the case may be, to the effect
                  that:

                                    (1)      each of the Power of Attorney and 
                           Custody Agreement has

                                       19


<PAGE>   20



                           been duly authorized, executed and delivered by or on
                           behalf of each Management Selling Stockholder and
                           constitutes a legal, valid and binding agreement of
                           such Management Selling Stockholder enforceable in
                           accordance with its terms;

                                    (2)      each of this Agreement and the
                           Pricing Agreement has been duly authorized, executed
                           and delivered by or on behalf of each Management
                           Selling Stockholder; the Agents and the Custodian for
                           such Management Selling Stockholders have been duly
                           and validly authorized to carry out all transactions
                           contemplated herein on behalf of such Management
                           Selling Stockholders; and the execution and
                           performance of this Agreement and the Pricing
                           Agreement and the consummation by such Management
                           Selling Stockholders of the transactions contemplated
                           herein and therein will not result in a breach or
                           violation of any of the terms and provisions of, or
                           constitute a default under, any agreement, franchise,
                           license, indenture, mortgage, deed of trust or other
                           instrument known to such counsel to which any such
                           Management Selling Stockholder is a party or by which
                           any are bound or to which any of the property of any
                           such Management Selling Stockholder is subject, or
                           violate any statute, order, rule or regulation known
                           to such counsel of any court or governmental agency
                           or body having jurisdiction over any of such
                           Management Selling Stockholders or any of their
                           properties; and no approval, authorization or consent
                           of any court or governmental agency or body is
                           required for the consummation of the transactions
                           contemplated by this Agreement and the Pricing
                           Agreement in connection with the sale of Shares by
                           such Management Selling Stockholders pursuant to this
                           Agreement, except such as have been obtained under
                           the 1933 Act and such as may be required under blue
                           sky laws applicable to the public offering of the
                           Shares by the several Underwriters and the clearance
                           of such offering with the NASD;

                                    (3)      each Management Selling Stockholder
                           has full right, power and authority to enter into
                           this Agreement and the Pricing Agreement and to sell,
                           transfer and deliver the Shares to be sold on the
                           First Closing Date or the Second Closing Date, as the
                           case may be, by such Management Selling Stockholder
                           hereunder and good and marketable title to such
                           Shares so sold, free and clear of all voting trust
                           arrangements, stockholder agreements, liens,
                           encumbrances, equities, claims and community property
                           rights whatsoever, has been transferred to the
                           Underwriters (who counsel may assume to be bona fide
                           purchasers) who have purchased such Shares hereunder;
                           and

                                    (4)      this Agreement and the Pricing
                           Agreement are legal, valid and binding agreements of
                           each Management Selling Stockholder except as

                                       20


<PAGE>   21



                           enforceability of the same may be limited by
                           bankruptcy, insolvency, reorganization, moratorium or
                           other similar laws affecting creditors' rights and by
                           the exercise of judicial discretion in accordance
                           with general principles applicable to equitable and
                           similar remedies and except with respect to those
                           provisions relating to indemnities for liabilities
                           arising under the 1933 Act, as to which no opinion
                           need be expressed.

                                    In rendering such opinion, such counsel may
                  state that they are relying, as to factual matters, on
                  certificates of the Management Selling Stockholders, in which
                  case their opinion is to state that they are so doing and
                  copies of said certificates are to be attached to the opinion
                  unless said certificates (or the information therein) have
                  been furnished to the Representatives in other form.

                           (v)      Such opinion or opinions of Sidley & Austin,
                  counsel for the Underwriters, dated the First Closing Date or
                  the Second Closing Date, as the case may be, with respect to
                  the incorporation of the Company, the validity of the Shares
                  to be sold by the Company, the Registration Statement and the
                  Prospectus and other related matters as you may reasonably
                  require, and the Company shall have furnished to such counsel
                  such documents and shall have exhibited to them such papers
                  and records as they request for the purpose of enabling them
                  to pass upon such matters.

                           (vi)     A certificate of the chief executive officer
                  and the principal financial officer of the Company, dated the
                  First Closing Date or the Second Closing Date, as the case may
                  be, to the effect that:

                                    (1)      the representations and warranties
                           of the Company set forth in Section 2 of this
                           Agreement are true and correct as of the date of this
                           Agreement and as of the First Closing Date or the
                           Second Closing Date, as the case may be, and the
                           Company has complied with all the agreements and
                           satisfied all the conditions on its part to be
                           performed or satisfied at or prior to such Closing
                           Date; and

                                    (2)      the Commission has not issued an
                           order preventing or suspending the use of the
                           Prospectus or any preliminary prospectus filed as a
                           part of the Registration Statement or any amendment
                           thereto; no stop order suspending the effectiveness
                           of the Registration Statement has been issued; and to
                           the best knowledge of the respective signers, no
                           proceedings for that purpose have been instituted or
                           are pending or contemplated under the 1933 Act.

                                    The delivery of the certificate provided for
                  in this subparagraph shall be and constitute a representation
                  and warranty of the Company as to the facts required in the
                  immediately foregoing clauses (1) and (2) of this subparagraph
                  to be set forth in said certificate.

                                       21


<PAGE>   22



                           (vii)    A certificate of each Selling Stockholder
                  dated the First Closing Date or the Second Closing Date, as
                  the case may be, to the effect that the representations and
                  warranties of such Selling Stockholder set forth in Section 3
                  of this Agreement are true and correct as of such date and the
                  Selling Stockholder has complied with all the agreements and
                  satisfied all the conditions on the part of such Selling
                  Stockholder to be performed or satisfied at or prior to such
                  date.

                           (viii)   At the time the Pricing Agreement is
                  executed and also on the First Closing Date or the Second
                  Closing Date, as the case may be, there shall be delivered to
                  you a letter addressed to you, as Representatives of the
                  Underwriters, from PriceWaterhouseCoopers LLP, independent
                  accountants, the first one to be dated the date of the Pricing
                  Agreement, the second one to be dated the First Closing Date
                  and the third one (in the event of a second closing) to be
                  dated the Second Closing Date, in form and substance
                  satisfactory to counsel for the Underwriters. There shall not
                  have been any change or decrease specified in the letters
                  referred to in this subparagraph which makes it impractical or
                  inadvisable in the judgment of the Representatives to proceed
                  with the public offering or purchase of the Shares as
                  contemplated hereby.

                           (ix)     A lock-up agreement substantially in the
                  form of Exhibit B signed by each of the persons listed on
                  Schedule C.

                           (x)      Such further certificates and documents as
                  you may reasonably request.

         All such opinions, certificates, letters and documents shall be in
compliance with the provisions hereof only if they are satisfactory to you and
to Sidley & Austin, counsel for the Underwriters, which approval shall not be
unreasonably withheld. The Company shall furnish you with such manually signed
or conformed copies of such opinions, certificates, letters and documents as you
request.

         If any condition to the Underwriters' obligations hereunder to be
satisfied prior to or at the First Closing Date is not so satisfied, this
Agreement at your election will terminate upon notification to the Company and
the Selling Stockholders without liability on the part of any Underwriter or the
Company or any Selling Stockholder, except for the expenses to be paid or
reimbursed by the Company pursuant to Sections 7 and 9 hereof and except to the
extent provided in Section 11 hereof.

           SECTION 9.   Reimbursement of Underwriters' Expenses. If the sale
to the Underwriters of the Shares on the First Closing Date is not consummated
because any condition of the Underwriters' obligations hereunder is not
satisfied or because of any refusal, inability or failure on the part of the
Company or any Selling Stockholder to perform any agreement herein or to comply
with any provision hereof, unless such failure to satisfy such condition or to
comply with any provision hereof is due to the default or omission of any
Underwriter, the Company agrees to

                                       22


<PAGE>   23



reimburse you and the other Underwriters upon demand for all out-of-pocket
expenses (including reasonable fees and disbursements of counsel) that shall
have been reasonably incurred by you and them in connection with the proposed
purchase and the sale of the Shares. Any such termination shall be without
liability of any party to any other party except that the provisions of this
Section, Section 7 and Section 11 shall at all times be effective and shall
apply.

           SECTION 10.  Effectiveness of Registration Statement. You, the
Company and the Selling Stockholders will use your, its and their best efforts
to cause the Registration Statement to become effective, if it has not yet
become effective, and to prevent the issuance of any stop order suspending the
effectiveness of the Registration Statement and, if such stop order be issued,
to obtain as soon as possible the lifting thereof.

           SECTION 11.  Indemnification. (a) The Company and each Management
Selling Stockholder, jointly and severally, agree to indemnify and hold harmless
each Underwriter and each person, if any, who controls any Underwriter within
the meaning of the 1933 Act or the Exchange Act against any losses, claims,
damages or liabilities, joint or several, to which such Underwriter or such
controlling person may become subject under the 1933 Act, the Exchange Act or
other federal or state statutory law or regulation, at common law or otherwise
(including in settlement of any litigation if such settlement is effected with
the written consent of the Company and/or such Management Selling Stockholders,
as the case may be), insofar as such losses, claims, damages or liabilities (or
actions in respect thereof) arise out of or are based upon any untrue statement
or alleged untrue statement of any material fact contained in the Registration
Statement, including the information deemed to be part of the Registration
Statement at the time of effectiveness pursuant to Rule 430A and/or Rule 434, if
applicable, any preliminary prospectus, the Prospectus, or any amendment or
supplement thereto, or arise out of or are based upon the omission or alleged
omission to state therein a material fact required to be stated therein or
necessary in order to make the statements therein not misleading, and will
reimburse each Underwriter and each such controlling person for any legal or
other expenses reasonably incurred by such Underwriter or such controlling
person in connection with investigating or defending any such loss, claim,
damage, liability or action; provided, however, that neither the Company nor any
Management Selling Stockholder will be liable in any such case to the extent
that (i) any such loss, claim, damage or liability arises out of or is based
upon an untrue statement or alleged untrue statement or omission or alleged
omission made in the Registration Statement, any preliminary prospectus, the
Prospectus or any amendment or supplement thereto in reliance upon and in
conformity with written information furnished to the Company by or on behalf of
any Underwriter through the Representatives, specifically for use therein; or
(ii) if such statement or omission was contained or made in any preliminary
prospectus and corrected in the Prospectus and (1) any such loss, claim, damage
or liability suffered or incurred by any Underwriter (or any person who controls
any Underwriter) resulted from an action, claim or suit by any person who
purchased Shares which are the subject thereof from such Underwriter in the
offering and (2) such Underwriter failed to deliver or provide a copy of the
Prospectus to such person at or prior to the confirmation of the sale of such
Shares in any case where such delivery is required by the 1933 Act. In addition
to their other obligations under this Section 11(a), the Company and the
Management Selling Stockholders agree that, as an interim measure during the
pendency of any claim, action, investigation, inquiry or other proceeding
arising out of or based upon any statement or omission, or any alleged statement
or omission, described in this Section 11(a), they will reimburse

                                       23


<PAGE>   24



the Underwriters on a monthly basis for all reasonable legal and other expenses
incurred in connection with investigating or defending any such claim, action,
investigation, inquiry or other proceeding, notwithstanding the absence of a
judicial determination as to the propriety and enforceability of the Company's
and the Management Selling Stockholders' obligation to reimburse the
Underwriters for such expenses and the possibility that such payments might
later be held to have been improper by a court of competent jurisdiction. This
indemnity agreement will be in addition to any liability which the Company and
the Management Selling Stockholders may otherwise have.

         In addition to and without limitation of the Company's obligation to
indemnify U.S. Bancorp Piper Jaffray Inc. as an Underwriter, the Company also
agrees to indemnify and hold harmless the Independent Underwriter and each
person, if any, who controls the Independent Underwriter within the meaning of
the 1933 Act or the Exchange Act, from and against any losses, claims, damages
or liabilities, joint or several, to which the Independent Underwriter or such
controlling person may become subject as a result of the Independent
Underwriter's participation as a "qualified independent underwriter" within the
meaning of Rule 2720 of the Conduct Rules of the NASD in connection with the
offering of the Shares.

         Insofar as this indemnity agreement may permit indemnification for
liabilities under the 1933 Act of any person who is a partner of an Underwriter
or who controls any Underwriter within the meaning of Section 15 of the 1933 Act
or Section 20 of the Exchange Act and who, at the date of this Agreement, is a
director or officer of the Company or controls the Company within the meaning of
Section 15 of the 1933 Act or Section 20 of the Exchange Act, such indemnity
agreement is subject to the undertaking of the Company in the Registration
Statement under Item 17 thereof.

         Without limiting the full extent of the Company's agreement to
indemnify each Underwriter and the Independent Underwriter, as herein provided,
each Management Selling Stockholder shall be liable under the indemnity
agreements contained in paragraph (a) of this Section only for an amount not
exceeding the proceeds (after deduction of the underwriting discount) received
by such Management Selling Stockholder from the sale of Shares hereunder (i.e.
if the over-allotment is not exercised, the Management Selling Stockholders
shall have no indemnification obligations under this Section 11(a)).

         (b)      Each of the Venture Capital Selling Stockholders agree to
indemnify and hold harmless each Underwriter and each person, if any, who
controls any Underwriter within the meaning of the 1933 Act or the Exchange Act
against any losses, claims, damages or liabilities, joint or several, to which
such Underwriter or such controlling person may become subject under the 1933
Act, the Exchange Act or other federal or state statutory law or regulation, at
common law or otherwise (including in settlement of litigation if such
settlement is effected with the written consent of the Company and/or such
Venture Capital Selling Stockholder), insofar as such losses, claims, damages or
liabilities (or actions in respect thereof) arise out of or are based upon any
untrue statement or alleged untrue statement of any material fact contained in
the Registration Statement, including the information deemed to be part of the
Registration Statement at the time of effectiveness pursuant to Rule 430A and/or
Rule 434, if applicable, any preliminary prospectus, the Prospectus, or any
amendment or supplement thereto, or arise out of or are based upon the omission
or alleged omission

                                       24


<PAGE>   25



to state therein a material fact required to be stated therein or necessary in
order to make the statements therein not misleading, in each case to the extent,
but only to the extent, that such untrue statement or alleged untrue statement
or omission or alleged omission specifically relates to such Venture Capital
Selling Stockholder, and will reimburse each Underwriter and each such
controlling person for any legal or other expenses reasonably incurred by such
Underwriter or such controlling person in connection with investigating or
defending any such loss, claim, damage, liability or action as such expenses are
incurred; provided, however, that such Venture Capital Selling Stockholder shall
be not liable in any such case to the extent that (i) any such loss, claim,
damage or liability arises out of or is based upon an untrue statement or
alleged untrue statement or omission or alleged omission made in the
Registration Statement, any preliminary prospectus, the Prospectus or any such
amendment or supplement thereto in reliance upon and in conformity with written
information furnished to the Company by any Underwriter through William Blair &
Company, L.L.C. expressly for use therein; or (ii) if such statement or omission
was contained or made in any preliminary prospectus and corrected in the
Prospectus and (1) any such loss, claim, damage or liability suffered or
incurred by any Underwriter (or any person who controls any Underwriter)
resulted from an action, claim or suit by any person who purchased Shares which
are the subject thereof from such Underwriter in the offering and (2) such
Underwriter failed to deliver or provide a copy of the Prospectus to such person
at or prior to the confirmation of the sale of such Shares in any case where
such delivery is required by the 1933 Act. In addition to their other
obligations under this Section 11(b), the Venture Capital Selling Stockholders
agree that, as an interim measure during the pendency of any claim, action,
investigation, inquiry or other proceeding arising out of or based upon any
statement or omission, or any alleged statement or omission, described in this
Section 11(b), they will reimburse the Underwriters on a monthly basis for all
reasonable legal and other expenses incurred in connection with investigating or
defending any such claim, action, investigation, inquiry or other proceeding,
notwithstanding the absence of a judicial determination as to the propriety and
enforceability of the Venture Capital Selling Stockholders' obligation to
reimburse the Underwriters for such expenses and the possibility that such
payments might later be held to have been improper by a court of competent
jurisdiction. This indemnity agreement will be in addition to any liability
which the Venture Capital Selling Stockholders may otherwise have.

                  Notwithstanding anything in this Section 11(b) to the
contrary, each Venture Capital Selling Stockholder shall be liable under the
indemnity agreements contained in paragraph (b) of this Section only for an
amount not exceeding the proceeds (after deduction of the underwriting discount)
received by such Venture Capital Selling Stockholder from the sale of Shares
hereunder.

         (c)      Each Underwriter, severally and not jointly, agrees to
indemnify and hold harmless the Company, each of its directors, each of its
officers who signed the Registration Statement, and each Selling Stockholder and
each person, if any, who controls the Company within the meaning of the 1933 Act
or the Exchange Act, against any losses, claims, damages or liabilities to which
the Company, or any such director, officer, Selling Stockholder or controlling
person may become subject under the 1933 Act, the Exchange Act or other federal
or state statutory law or regulation, at common law or otherwise (including in
settlement of any litigation, if such settlement is effected with the written
consent of such Underwriter), insofar as such losses, claims, damages or
liabilities (or actions in respect thereof) arise out of or are based upon any
untrue or alleged untrue statement of any material fact contained in the
Registration Statement, any preliminary prospectus, the

                                       25


<PAGE>   26



Prospectus, or any amendment or supplement thereto (including any prospectus
wrapper), or arise out of or are based upon the omission or alleged omission to
state therein a material fact required to be stated therein or necessary in
order to make the statements therein not misleading, in each case to the extent,
but only to the extent, that such untrue statement or alleged untrue statement
or omission or alleged omission was made in the Registration Statement, any
preliminary prospectus, the Prospectus, or any amendment or supplement thereto
in reliance upon and in conformity with Section 4 of this Agreement or any other
written information furnished to the Company by such Underwriter through the
Representatives specifically for use in the preparation thereof; and will
reimburse any legal or other expenses reasonably incurred by the Company, or any
such director, officer, Selling Stockholder or controlling person in connection
with investigating or defending any such loss, claim, damage, liability or
action. In addition to their other obligations under this Section 11(c), the
Underwriters agree that, as an interim measure during the pendency of any claim,
action, investigation, inquiry or other proceeding arising out of or based upon
any statement or omission, or any alleged statement or omission, described in
this Section 11(c), they will reimburse the Company and the Selling Stockholders
on a monthly basis for all reasonable legal and other expenses incurred in
connection with investigating or defending any such claim, action,
investigation, inquiry or other proceeding, notwithstanding the absence of a
judicial determination as to the propriety and enforceability of the
Underwriters' obligation to reimburse the Company and the Selling Stockholders
for such expenses and the possibility that such payments might later be held to
have been improper by a court of competent jurisdiction. This indemnity
agreement will be in addition to any liability which such Underwriter may
otherwise have.

         (d)      Promptly after receipt by an indemnified party under this
Section of notice of the commencement of any action, such indemnified party
will, if a claim in respect thereof is to be made against an indemnifying party
under this Section, notify the indemnifying party of the commencement thereof;
but the omission so to notify the indemnifying party will not relieve it from
any liability which it may have to any indemnified party except to the extent
that the indemnifying party was prejudiced by such failure to notify. In case
any such action is brought against any indemnified party, and it notifies an
indemnifying party of the commencement thereof, the indemnifying party will be
entitled to participate in, and, to the extent that it may wish, jointly with
all other indemnifying parties similarly notified, to assume the defense
thereof, with counsel satisfactory to such indemnified party; provided, however,
if the defendants in any such action include both the indemnified party and the
indemnifying party and the indemnified party shall have reasonably concluded
that there may be legal defenses available to it and/or other indemnified
parties which are different from or additional to those available to the
indemnifying party, or the indemnified and indemnifying parties may have
conflicting interests which would make it inappropriate for the same counsel to
represent both of them, the indemnified party or parties shall have the right to
select separate counsel to assume such legal defense and otherwise to
participate in the defense of such action on behalf of such indemnified party or
parties. Upon receipt of notice from the indemnifying party to such indemnified
party of its election so to assume the defense of such action and approval by
the indemnified party of counsel, the indemnifying party will not be liable to
such indemnified party under this Section for any legal or other expenses
subsequently incurred by such indemnified party in connection with the defense
thereof unless (i) the indemnified party shall have employed such counsel in
connection with the assumption of legal defense in accordance with the proviso
to the next preceding sentence (it being

                                       26


<PAGE>   27



understood, however, that the indemnifying party shall not be liable for the
expenses of more than one separate counsel (in addition to any local counsel),
approved by the Representatives in the case of paragraph (a)(i) or (b)(i)
representing all indemnified parties not having different or additional defenses
or potential conflicting interest among themselves who are parties to such
action; provided, that, if indemnity is sought as a result of the Independent
Underwriter's participation as a "qualified independent underwriter" within the
meaning of Rule 2720 of the Conduct Rules of the NASD in connection with the
offering, then, in addition to the expenses of such counsel for the indemnified
parties, the indemnifying party shall be liable for the expenses of not more
than one counsel (in addition to any local counsel) separate from its own
counsel and that of the other indemnified parties for the Independent
Underwriter in its capacity as such), (ii) the indemnifying party shall not have
employed counsel satisfactory to the indemnified party to represent the
indemnified party within a reasonable time after notice of commencement of the
action or (iii) the indemnifying party has authorized the employment of counsel
for the indemnified party at the expense of the indemnifying party. No
indemnifying party shall, without the prior written consent of the indemnified
party, effect any settlement of any pending or threatened proceeding in respect
of which any indemnified party is or could have been a party and indemnity could
have been sought hereunder by such indemnified party, unless such settlement
includes an unconditional release of such indemnified party from all liability
arising out of such proceeding.

         (e)      If the indemnification provided for in this Section is
unavailable to an indemnified party under paragraphs (a), (b) or (c) hereof in
respect of any losses, claims, damages or liabilities referred to therein, then
each applicable indemnifying party, in lieu of indemnifying such indemnified
party, shall contribute to the amount paid or payable by such indemnified party
as a result of such losses, claims, damages or liabilities (i) in such
proportion as is appropriate to reflect the relative benefits received by the
Company, the Selling Stockholders and the Underwriters from the offering of the
Shares or (ii) if the allocation provided by clause (i) above is not permitted
by applicable law, in such proportion as is appropriate to reflect not only the
relative benefits referred to in clause (i) above but also the relative fault of
the Company, the Selling Stockholders and the Underwriters in connection with
the statements or omissions, or in connection with any violation of applicable
laws or regulations of foreign jurisdictions where Reserved Shares have been
offered, which resulted in such losses, claims, damages or liabilities, as well
as any other relevant equitable considerations. The respective relative benefits
received by the Company, the Selling Stockholders and the Underwriters shall be
deemed to be in the same proportion in the case of the Company and the Selling
Stockholders, as the total price paid to the Company and the Selling
Stockholders for the Shares by the Underwriters (net of underwriting discount
but before deducting expenses), and in the case of the Underwriters as the
underwriting discount received by them bears to the total of such amounts paid
to the Company and the Selling Stockholders and received by the Underwriters as
underwriting discount in each case as contemplated by the Prospectus. The
relative fault of the Company and the Selling Stockholders and the Underwriters
shall be determined by reference to, among other things, whether the untrue or
alleged untrue statement of a material fact or the omission to state a material
fact relates to information supplied by the Company or by the Selling
Stockholders or by the Underwriters and the parties' relative intent, knowledge,
access to information and opportunity to correct or prevent such statement or
omission or any violation of the nature referred to above. The amount paid or
payable by a party as a result of the losses, claims, damages and liabilities
referred to above shall be deemed to include any legal or other fees or expenses
reasonably incurred by such party in connection with investigating or defending
any action or claim.

                                       27


<PAGE>   28



         The Company and the Underwriters agree that U.S. Bancorp Piper Jaffray
Inc. will not receive any additional benefits hereunder for serving as the
Independent Underwriter in connection with the offering and sale of Shares.

         The Company, the Selling Stockholders and the Underwriters agree that
it would not be just and equitable if contribution pursuant to this Section were
determined by pro rata allocation or by any other method of allocation which
does not take account of the equitable considerations referred to in the first
paragraph of this subsection (e). Notwithstanding the provisions of this
Section, no Underwriter shall be required to contribute any amount in excess of
the amount by which the total price at which the Shares underwritten by it and
distributed to the public were offered to the public exceeds the amount of any
damages which such Underwriter has otherwise been required to pay by reason of
such untrue or alleged untrue statement or omission or alleged omission. No
person guilty of fraudulent misrepresentation (within the meaning of Section
11(f) of the 1933 Act) shall be entitled to contribution from any person who was
not guilty of such fraudulent misrepresentation. The Underwriters' obligations
to contribute pursuant to this Section are several in proportion to their
respective underwriting commitments and not joint. In no event shall the
liability of a Selling Stockholder under this Section 11(e) exceed the amount
that such Selling Stockholder would have been required to pay under Section
11(a) (with respect to a Management Selling Stockholder) or Section 11(b) (with
respect to a Venture Capital Selling Stockholder) had such indemnification held
to be available thereunder.

         (f)      In connection with the offer and sale of the Reserved Shares,
the Company agrees, promptly upon a request in writing, to indemnify and hold
harmless the Underwriters from and against any and all losses, liabilities,
claims, damages and expenses incurred by them as a result of the failure of
recipients of Reserved Shares to pay for and accept delivery thereof which, by
the end of the first business day following the date of this Agreement, were
subject to a properly confirmed agreement to purchase.

         (g)      The provisions of this Section shall survive any termination
of this Agreement.

           Section 12.  Default of Underwriters. It shall be a condition to
the agreement and obligation of the Company and the Selling Stockholders to sell
and deliver the Shares hereunder, and of each Underwriter to purchase the Shares
hereunder, that, except as hereinafter in this paragraph provided, each of the
Underwriters shall purchase and pay for all Shares agreed to be purchased by
such Underwriter hereunder upon tender to the Representatives of all such Shares
in accordance with the terms hereof. If any Underwriter or Underwriters default
in their obligations to purchase Shares hereunder on the First Closing Date and
the aggregate number of Shares which such defaulting Underwriter or Underwriters
agreed but failed to purchase does not exceed 10 percent of the total number of
Shares which the Underwriters are obligated to purchase on the First Closing
Date, the Representatives may make arrangements satisfactory to the Company and
the Selling Stockholders for the purchase of such Shares by other persons,
including any of the Underwriters, but if no such arrangements are made by such
date the nondefaulting Underwriters shall be obligated severally, in proportion
to their respective commitments hereunder, to purchase the Shares which such
defaulting Underwriters agreed but failed to purchase on such date. If any
Underwriter or Underwriters so

                                       28


<PAGE>   29



default and the aggregate number of Shares with respect to which such default or
defaults occur is more than the above percentage and arrangements satisfactory
to the Representatives and the Company and the Selling Stockholders for the
purchase of such Shares by other persons are not made within 36 hours after such
default, this Agreement will terminate without liability on the part of any
nondefaulting Underwriter or the Company or the Selling Stockholders, except for
the expenses to be paid by the Company pursuant to Section 7 hereof and except
to the extent provided in Section 11 hereof.

         In the event that Shares to which a default relates are to be purchased
by the nondefaulting Underwriters or by another party or parties, the
Representatives or the Company shall have the right to postpone the First
Closing Date for not more than seven business days in order that the necessary
changes in the Registration Statement, Prospectus and any other documents, as
well as any other arrangements, may be effected. As used in this Agreement, the
term "Underwriter" includes any person substituted for an Underwriter under this
Section. Nothing herein will relieve a defaulting Underwriter from liability for
its default.

           SECTION 13.  Effective Date. This Agreement shall become effective
immediately as to Sections 7, 9, 11 and 14 hereof and as to all other provisions
at 10:00 A.M., Chicago Time, on the day following the date upon which the
Pricing Agreement is executed and delivered, unless such a day is a Saturday,
Sunday or holiday (and in that event this Agreement shall become effective at
such hour on the business day next succeeding such Saturday, Sunday or holiday);
but this Agreement shall nevertheless become effective at such earlier time
after the Pricing Agreement is executed and delivered as you may determine on
and by notice to the Company and the Selling Stockholders or by release of any
Shares for sale to the public. For the purposes of this Section, the Shares
shall be deemed to have been so released upon the release for publication of any
newspaper advertisement relating to the Shares or upon the release by you of
telegrams (i) advising Underwriters that the Shares are released for public
offering, or (ii) offering the Shares for sale to securities dealers, whichever
may occur first.

           SECTION 14.  Termination. Without limiting the right to terminate 
this Agreement pursuant to any other provision hereof:

                  (a)      This Agreement may be terminated by the Company by
         notice to you and the Selling Stockholders or by you by notice to the
         Company and the Selling Stockholders at any time prior to the time this
         Agreement shall become effective as to all its provisions, and any such
         termination shall be without liability on the part of the Company or
         the Selling Stockholders to any Underwriter (except for the expenses to
         be paid or reimbursed pursuant to Section 7 hereof and except to the
         extent provided in Section 11 hereof) or of any Underwriter to the
         Company or the Selling Stockholders.

                  (b)      This Agreement may also be terminated by you prior to
         the First Closing Date, and the option referred to in Section 5, if
         exercised, may be canceled at any time prior to the Second Closing
         Date, if (i) trading in securities on the Nasdaq National Market or the
         New York Stock Exchange shall have been suspended or minimum prices
         shall have been established on such exchange, or (ii) a banking
         moratorium shall have been declared by

                                       29


<PAGE>   30



         Illinois, New York, or United States authorities, or (iii) there shall
         have been any change in financial markets or in political, economic or
         financial conditions which, in the opinion of the Representatives,
         either renders it impracticable or inadvisable to proceed with the
         offering and sale of the Shares on the terms set forth in the
         Prospectus or materially and adversely affects the market for the
         Shares, or (iv) there shall have been an outbreak of major armed
         hostilities between the United States and any foreign power which in
         the opinion of the Representatives makes it impractical or inadvisable
         to offer or sell the Shares. Any termination pursuant to this paragraph
         (b) shall be without liability on the part of any Underwriter to the
         Company or the Selling Stockholders or on the part of the Company to
         any Underwriter or the Selling Stockholders (except for expenses to be
         paid or reimbursed pursuant to Section 7 hereof and except to the
         extent provided in Section 11 hereof).

           SECTION 15.  Representations and Indemnities to Survive Delivery.
The respective indemnities, agreements, representations, warranties and other
statements of the Company, of its officers, of the Selling Stockholders and of
the several Underwriters set forth in or made pursuant to this Agreement will
remain in full force and effect, regardless of any investigation made by or on
behalf of any Underwriter or the Company or any of its or their partners,
principals, members, officers or directors or any controlling person, or the
Selling Stockholders as the case may be, and will survive delivery of and
payment for the Shares sold hereunder.

           SECTION 16.  Notices. All communications hereunder will be in
writing and, if sent to the Underwriters will be mailed, delivered or telecopied
and confirmed to you c/o William Blair & Company, L.L.C., 222 West Adams Street,
Chicago, Illinois 60606, with a copy to Kevin Blatchford, Sidley & Austin, One
First National Plaza, Chicago, Illinois 60603, telecopy (312) 853-7036; if sent
to the Company will be mailed, delivered or telecopied and confirmed to the
Company at its corporate headquarters with a copy to Lawrence S. Wittenberg,
Testa, Hurwitz & Thibeault, LLP, 125 High Street, Boston, Massachusetts 02110,
telecopy (617) 248-7100; if sent to the Management Selling Stockholders will be
mailed, delivered or telecopied and confirmed to the Agents and the Custodian at
such address as they have previously furnished to the Company and the
Representatives, with a copy to Jill M. Cohen, Bachner, Tally, Polevoy & Misher
LLP, 380 Madison Avenue, New York, New York 10017-2590, telecopy (212) 682-5729;
and if sent to the Venture Capital Selling Stockholders will be mailed,
delivered or telecopied and confirmed to the Agents and the Custodian at such
address as they have previously furnished to the Company and the
Representatives, with a copy to James Lerner, Kirkland and Ellis, 200 East
Randolph Drive, Chicago, Illinois 60601, telecopy (312) 861-2200.

           SECTION 17.  Successors. This Agreement and the Pricing Agreement
will inure to the benefit of and be binding upon the parties hereto and their
respective successors, personal representatives and assigns, and to the benefit
of the officers and directors and controlling persons referred to in Section 11,
and no other person will have any right or obligation hereunder. The term
"successors" shall not include any purchaser of the Shares as such from any of
the Underwriters merely by reason of such purchase.

           SECTION 18.  Representation of Underwriters. You will act as 
Representatives for the

                                       30


<PAGE>   31



several Underwriters in connection with this financing, and any action under or
in respect of this Agreement taken by you will be binding upon all the
Underwriters.

           SECTION 19.  Partial Unenforceability. If any section, paragraph or
provision of this Agreement is for any reason determined to be invalid or
unenforceable, such determination shall not affect the validity or
enforceability of any other section, paragraph or provision hereof.

           SECTION 20.  Applicable Law. This Agreement and the Pricing Agreement
shall be governed by and construed in accordance with the laws of the State of
Illinois.

         If the foregoing is in accordance with your understanding of our
agreement, kindly sign and return to us the enclosed duplicates hereof,
whereupon it will become a binding agreement among the Company, the Selling
Stockholders and the several Underwriters including you, all in accordance with
its terms.

                                    Very truly yours,

                                    ONESOURCE INFORMATION SERVICES, INC.


                                    By__________________________________________
                                             Chief Executive Officer


                                    The Selling Stockholders named in Schedule B
                                    hereto, in their individual capacities


                                    By__________________________________________
                                             Agent and Attorney-in-Fact


                                       31


<PAGE>   32



The foregoing Agreement is hereby 
confirmed and accepted as of 
the date first above written.

WILLIAM BLAIR & COMPANY, L.L.C.
U.S. BANCORP PIPER JAFFRAY INC.
ADAMS, HARKNESS & HILL, INC.
Acting as Representatives of the
several Underwriters named in
Schedule A.

By William Blair & Company, L.L.C.


By__________________________________
         Principal



                                       32


<PAGE>   33



                                   SCHEDULE A

                                                                   Number of
                                                                  Firm Shares
Underwriter                                                     to be Purchased
- -----------                                                     ---------------

William Blair & Company, L.L.C.

U.S. Bancorp Piper Jaffray Inc.

Adams, Harkness & Hill, Inc.

                           TOTAL




                                       33


<PAGE>   34



                                  SCHEDULE B-1

                                                  Number of          Number of
                                                 Firm Shares       Option Shares
                                                  to be Sold        to be Sold
                                                 -----------       -------------

Venture Capital Selling Stockholders:

Information Partners Capital Fund, L.P.

William Blair Venture Partners III
   Limited Partnership          
                                                                   -------------


                           TOTAL



                                       34


<PAGE>   35



                                  SCHEDULE B-2

                                                                  Number of
                                                                Option Shares
                                                                 to be Sold
                                                                -------------
Management Selling Stockholders:

Daniel J. Schimmel


                                                                -------------


                           TOTAL



                                       35


<PAGE>   36



                                   SCHEDULE C

                  [persons who have signed lock-up agreements]


James Becker
David Dominik (on behalf of BCIP Trust Associates, BCIP Associates and
 Information Partners)
Philip Garlick
Martin F. Kahn
Roy D. Landon
Lotus Development Corporation
Gregg S. Newmark
Daniel J. Schimmel
Mark Van Dine


                                       36


<PAGE>   37




                                                                       Exhibit A

                      ONESOURCE INFORMATION SERVICES, INC.

                          ______ Shares Common Stock(2)


                                PRICING AGREEMENT

                                                               ___________, 1999

William Blair & Company, L.L.C.
U.S. Bancorp Piper Jaffray Inc.
Adams, Harkness & Hill, Inc.
   As Representatives of the Several
   Underwriters
c/o William Blair & Company, L.L.C.
222 West Adams Street
Chicago, Illinois 60606

Ladies and Gentlemen:

         Reference is made to the Underwriting Agreement dated
_________________, 1999 (the "Underwriting Agreement") relating to the sale by
the Company and the Selling Stockholders and the purchase by the several
Underwriters for whom William Blair & Company, L.L.C., U.S. Bancorp Piper
Jaffray Inc. and Adams, Harkness & Hill, Inc. are acting as representatives (the
"Representatives"), of the above Shares. All terms herein shall have the
definitions contained in the Underwriting Agreement except as otherwise defined
herein.

         Pursuant to Section 5 of the Underwriting Agreement, the Company and
each of the Selling Stockholders agree with the Representatives as follows:

         1. The initial public offering price per share for the Shares shall be
$__________.

         2. The purchase price per share for the Shares to be paid by the
several Underwriters shall be $_____________, being an amount equal to the
initial public offering price set forth above less $____________ per share.




- ----------------------
(2)Plus an option to acquire up to ___ additional shares to cover 
over-allotments




                                       37


<PAGE>   38



         If the foregoing is in accordance with your understanding of our
agreement, kindly sign and return to us the enclosed duplicates hereof,
whereupon it will become a binding agreement among the Company, the Selling
Stockholders and the several Underwriters, including you, all in accordance with
its terms.

                                       Very truly yours,

                                       ONESOURCE INFORMATION SERVICES, INC.


                                       By_______________________________________
                                             Chief Executive Officer




                                       The Selling Stockholders named in
                                       Schedule B to the Underwriting Agreement,
                                       in their individual capacities


                                       By_______________________________________
                                             Agent and Attorney-in-Fact


The foregoing Agreement is hereby 
confirmed and accepted as of the 
date first above written.

WILLIAM BLAIR & COMPANY, L.L.C.
U.S. BANCORP PIPER JAFFRAY INC.
ADAMS, HARKNESS & HILL, INC.

Acting as Representatives of the
several Underwriters

By William Blair & Company, L.L.C.



By___________________________________
         Principal



                                       38


<PAGE>   39



                                                                       Exhibit B

                      ONESOURCE INFORMATION SERVICES, INC.

                                LOCK-UP AGREEMENT

                                                               ___________, 1999

William Blair & Company, L.L.C.
U.S. Bancorp Piper Jaffray Inc.
Adams, Harkness & Hill, Inc.
   As Representatives of the Several
   Underwriters
c/o William Blair & Company, L.L.C.
222 West Adams Street
Chicago, Illinois  60606

         Re:    Proposed Public Offering by OneSource Information Services, Inc.
                ----------------------------------------------------------------

Ladies and Gentlemen:

         The undersigned, a securityholder [and an officer and/or director] of
OneSource Information Services, Inc. a Delaware corporation (the "Company"),
understands that William Blair & Company, L.L.C. ("William Blair"), U.S. Bancorp
Piper Jaffray Inc. and Adams, Harkness & Hill, Inc. propose to enter into an
Underwriting Agreement (the "Underwriting Agreement") with the Company and
certain stockholders of the Company providing for the public offering of shares
(the "Securities") of the Company's common stock, par value $.01 per share (the
"Common Stock"). In recognition of the benefit that such an offering will confer
upon the undersigned as a securityholder [and an officer and/or director] of the
Company, and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the undersigned agrees with each
underwriter to be named in the Underwriting Agreement that, during a period of
180 days from the date of the Underwriting Agreement (the "Lock-Up Period"), the
undersigned will not, without the prior written consent of William Blair,
directly or indirectly, (i) offer, pledge, sell, contract to sell, sell any
option or contract to purchase, purchase any option or contract to sell, grant
any option, right or warrant for the sale of, or otherwise dispose of or
transfer any shares of the Company's Common Stock or any securities convertible
into or exchangeable or exercisable for Common Stock, whether now owned or
hereafter acquired by the undersigned or with respect to which the undersigned
has or hereafter acquires the power of disposition (the "Lock-Up Shares"), or
file any registration statement under the Securities Act of 1933, as amended,
with respect to any of the foregoing or (ii) enter into any swap or any other
agreement or any transaction that transfers, in whole or in part, directly or
indirectly, the economic consequence of ownership of the Common Stock, whether
any such swap or transaction is to be settled by delivery of Common Stock or
other securities, in cash or otherwise.

         Notwithstanding the foregoing, the undersigned may transfer any or all 
of the Lock-Up


                                       39


<PAGE>   40



Shares (i) as a bona fide gift or gifts or (ii) as a distribution to limited
partners or shareholders of such person; provided, however, that in any such
case it shall be a condition to the transfer that the transferee execute an
agreement stating that the transferee is receiving and holding the LockUp Shares
subject to the provisions of this letter agreement. The transferor shall notify
William Blair in writing prior to the transfer and there shall be no further
transfer of such Lock-Up Shares except in accordance with this letter agreement.
Following expiration of the Lock-Up Period, it is understood that the
undersigned may dispose of Lock-Up Shares free of any contractual obligation
hereunder.

         It is understood that, if the Underwriting Agreement is not executed by
June 30, 1999 or if the Underwriting Agreement shall terminate or be terminated
prior to payment for and delivery of the Securities, you will release the
undersigned from the obligations under this letter agreement.

                                             Very truly yours,

                                             Signature:
                                             Print Name:



                                       40


<PAGE>   41



                                                                       Exhibit C

                     [Opinion of Testa, Hurwitz & Thibeault]









                                       41


<PAGE>   42


                                                                       Exhibit D

                        [Opinion of Arnheim Tite & Lewis]











                                       42






<PAGE>   1
                                                                    EXHIBIT 3.01



            SECOND AMENDED AND RESTATED CERTIFICATE OF INCORPORATION

                                       OF

                      ONESOURCE INFORMATION SERVICES, INC.

                        (INCORPORATED SEPTEMBER 3, 1993)

                                   * * * * * *


         I, Daniel J. Schimmel, President and Chief Executive Officer of
OneSource Information Services, Inc. (the "CORPORATION"), a corporation
organized and existing under and by virtue of the General Corporation Law of the
State of Delaware, do hereby certify that the Certificate of Incorporation of
OneSource Information Services, Inc., as amended, originally incorporated under
the name, Datatext Holding Corporation, and subsequently, OneSource Holding
Corporation, has been further amended, and restated as amended, in accordance
with provisions of Sections 242 and 245 of the General Corporation Law of the
State of Delaware, and, as amended and restated, is set forth in its entirety as
follows:

         FIRST.   The name of the Corporation is OneSource Information Services,
Inc.

         SECOND.  The address of the registered office of the Corporation in the
State of Delaware is 1013 Centre Road, Wilmington, New Castle County, Delaware
19085. The name of its registered agent at such address is The Prentice-Hall
Corporation System, Inc.

         THIRD.   The nature of the business or purposes to be conducted or
promoted is to engage in any lawful act or activity for which corporations may
be organized under the General Corporation Law of the State of Delaware.

         FOURTH.  The total number of shares of all classes of capital stock
which the Corporation shall have authority to issue is 21,000,000 shares,
consisting of 20,000,000 shares of Common Stock with a par value of $.01 per
share (the "COMMON STOCK") and 1,000,000 shares of Preferred Stock with a par
value of $.01 per share (the "PREFERRED STOCK").

         A description of the respective classes of stock and a statement of the
designations, powers, preferences and rights, and the qualifications,
limitations and restrictions of the Preferred Stock and Common Stock are as
follows:

         A.       COMMON STOCK

         1.       GENERAL. All shares of Common Stock will be identical and will
entitle the holders thereof to the same rights, powers and privileges. The
rights, powers and privileges of the holders of the Common Stock are subject to
and qualified by the rights of holders of the Preferred Stock.


<PAGE>   2

         2.       DIVIDENDS. Dividends may be declared and paid on the Common
Stock from funds lawfully available therefor as and when determined by the Board
of Directors and subject to any preferential dividend rights of any then
outstanding Preferred Stock.

         3.       DISSOLUTION, LIQUIDATION OR WINDING UP. In the event of any
dissolution, liquidation or winding up of the affairs of the Corporation,
whether voluntary or involuntary, each issued and outstanding share of Common
Stock shall entitle the holder thereof to receive an equal portion of the net
assets of the Corporation available for distribution to the holders of Common
Stock, subject to any preferential rights of any then outstanding Preferred
Stock.

         4. VOTING RIGHTS. Except as otherwise required by law or this Second
Amended and Restated Certificate of Incorporation, each holder of Common Stock
shall have one vote in respect of each share of stock held of record by such
holder on the books of the Corporation for the election of directors and on all
matters submitted to a vote of stockholders of the Corporation. Except as
otherwise required by law or provided herein, holders of Common Stock shall vote
together with holders of the Preferred Stock as a single class, subject to any
special or preferential voting rights of any then outstanding Preferred Stock.
There shall be no cumulative voting.

         B.       PREFERRED STOCK

         The Preferred Stock may be issued in one or more series at such time or
times and for such consideration or considerations as the Board of Directors of
the Corporation may determine. Each series shall be so designated as to
distinguish the shares thereof from the shares of all other series and classes.
Except as otherwise provided in this Second Amended and Restated Certificate of
Incorporation, different series of Preferred Stock shall not be construed to
constitute different classes of shares for the purpose of voting by classes.

         The Board of Directors is expressly authorized to provide for the
issuance of all or any shares of the undesignated Preferred Stock in one or more
series, each with such designations, preferences, voting powers (or special,
preferential or no voting powers), relative, participating, optional or other
special rights and privileges and such qualifications, limitations or
restrictions thereof as shall be stated in the resolution or resolutions adopted
by the Board of Directors to create such series, and a certificate of said
resolution or resolutions (a "CERTIFICATE OF DESIGNATION") shall be filed in
accordance with the General Corporation Law of the State of Delaware. The
authority of the Board of Directors with respect to each such series shall
include, without limitation of the foregoing, the right to provide that the
shares of each such series may be: (i) subject to redemption at such time or
times and at such price or prices; (ii) entitled to receive dividends (which may
be cumulative or non-cumulative) at such rates, on such conditions, and at such
times, and payable in preference to, or in such relation to, the dividends
payable on any other class or classes or any other series; (iii) entitled to
such rights upon the dissolution of, or upon any distribution of the assets of,
the Corporation; (iv) convertible into, or exchangeable for, shares of any other
class or classes of stock, or of any other series of the same or any other class
or classes of stock of the Corporation at such price or prices or at such rates
of 


                                      -2-

<PAGE>   3

exchange and with such adjustments, if any; (v) entitled to the benefit of such
limitations, if any, on the issuance of additional shares of such series or
shares of any other series of Preferred Stock; or (vi) entitled to such other
preferences, powers, qualifications, rights and privileges, all as the Board of
Directors may deem advisable and as are not inconsistent with law and the
provisions of this Amended and Restated Certificate of Incorporation.

         FIFTH.   The Corporation is to have perpetual existence.

         SIXTH.   The following provisions are included for the management of 
the business and the conduct of the affairs of the Corporation, and for further
definition, limitation and regulation of the powers of the Corporation and of
its Board of Directors and stockholders:

             1.   The business and affairs of the Corporation shall be managed
by or under the direction of the Board of Directors of the Corporation.

             2.   The Board of Directors of the Corporation is expressly
authorized to adopt, amend or repeal the By-laws of the Corporation, subject to
any limitation thereof contained in the By-laws. The stockholders shall also
have the power to adopt, amend or repeal the By-laws of the Corporation;
PROVIDED, HOWEVER, that, in addition to any vote of the holders of any class or
series of stock of the Corporation required by law or by this Amended and
Restated Certificate of Incorporation, the affirmative vote of the holders of at
least eighty percent (80%) of the voting power of all of the then outstanding
shares of the capital stock of the Corporation entitled to vote generally in the
election of directors, voting together as a single class, shall be required to
adopt, amend or repeal any provision of the By-laws of the Corporation.

             3.   Stockholders of the Corporation may take any action by
written consent in lieu of a meeting pursuant to the procedure set forth in the
By-Laws.

             4.   Special meetings of stockholders may be called at any time
only by the President, the Chairman of the Board of Directors (if any) or a
majority of the Board of Directors. Business transacted at any special meeting
of stockholders shall be limited to matters relating to the purpose or purposes
stated in the notice of meeting.

             5.   The books of the Corporation may be kept at such place
within or without the State of Delaware as the By-laws of the Corporation may
provide or as may be designated from time to time by the Board of Directors of
the Corporation.

         SEVENTH.

         1.  NUMBER OF DIRECTORS. The number of directors which shall constitute
the whole Board of Directors shall be determined by resolution of a majority of
the Board of Directors, but in no event shall the number of directors be less
than three. The number of directors may be decreased at any time and from time
to time by a majority of the directors then in office, but only to eliminate
vacancies existing by reason of the death, resignation, removal or expiration of
the term of one or more directors. The directors shall be elected at the annual
meeting of 



                                      -3-


<PAGE>   4

stockholders by such stockholders as have the right to vote on such election.
Directors need not be stockholders of the Corporation.

         2.       ELECTION OF DIRECTORS. Elections of directors need not be by
written ballot except as and to the extent provided in the By-laws of the
Corporation.

         3.       TERMS OF OFFICE. Each director shall serve for a term ending
on the date of the third annual meeting following the annual meeting at which
such director was elected.

         4.       TENURE. Notwithstanding any provisions to the contrary
contained herein, each director shall hold office until his or her successor is
elected and qualified, or until his or her earlier death, resignation or
removal.

         5.       VACANCIES. Unless and until filled by the stockholders, any
vacancy in the Board of Directors, however occurring, including a vacancy
resulting from an enlargement of the Board of Directors, may be filled only by
vote of a majority of the directors then in office, even if less than a quorum,
or by a sole remaining director. A director elected to fill a vacancy shall be
elected for the unexpired term of his or her predecessor in office, if
applicable, and a director chosen to fill a position resulting from an increase
in the number of directors shall hold office until the next election and until
his or her successor is elected and qualified, or until his or her earlier
death, resignation or removal.

         6.       QUORUM. A majority of the total number of the whole Board of
Directors shall constitute a quorum at all meetings of the Board of Directors.
In the event one or more of the directors shall be disqualified to vote at any
meeting, then the required quorum shall be reduced by one for each such director
so disqualified; provided, however, that in no case shall less than one-third
(1/3) of the number so fixed constitute a quorum. In the absence of a quorum at
any such meeting, a majority of the directors present may adjourn the meeting
from time to time without further notice other than announcement at the meeting,
until a quorum shall be present.

         7.       ACTION AT MEETING. At any meeting of the Board of Directors at
which a quorum is present, the vote of a majority of those present shall be
sufficient to take any action, unless a different vote is specified by law or
the Corporation's By-laws.

         8.       REMOVAL. Any one or more or all of the directors may be
removed without cause only by the holders of at least seventy-five percent (75%)
of the shares then entitled to vote at an election of directors. Any one or more
or all of the directors may be removed with cause only by the holders of at
least a majority of the shares then entitled to vote at an election of
directors.

         9.       STOCKHOLDER NOMINATIONS AND INTRODUCTION OF BUSINESS, ETC.
Advance notice of stockholder nominations for election of directors and other
business to be brought by stockholders before a meeting of stockholders shall be
given in the manner provided in the By-laws of the Corporation.



                                      -4-



<PAGE>   5

         10.      RIGHTS OF PREFERRED STOCK. The provisions of this Article are
subject to the rights of the holders of any series of Preferred Stock from time
to time outstanding.

         EIGHTH.  No director (including any advisory director) of the
Corporation shall be personally liable to the Corporation or its stockholders
for monetary damages for breach of fiduciary duty as a director notwithstanding
any provision of law imposing such liability; provided, however, that, to the
extent provided by applicable law, this provision shall not eliminate the
liability of a director (i) for any breach of the director's duty of loyalty to
the Corporation or its stockholders, (ii) for acts or omissions not in good
faith or which involve intentional misconduct or a knowing violation of law,
(iii) under Section 174 of the General Corporation Law of the State of Delaware,
or (iv) for any transaction from which the director derived an improper personal
benefit. No amendment to or repeal of this provision shall apply to or have any
effect on the liability or alleged liability of any director for or with respect
to any acts or omissions of such director occurring prior to such amendment or
repeal.

         NINTH. The Board of Directors of the Corporation, when evaluating any
offer of another party (a) to make a tender or exchange offer for any equity
security of the Corporation or (b) to effect a business combination, shall, in
connection with the exercise of its judgment in determining what is in the best
interests of the Corporation as whole, be authorized to give due consideration
to any such factors as the Board of Directors determines to be relevant,
including, without limitation:

         (i) the interests of the Corporation's stockholders, including the
      possibility that these interests might be best served by the continued
      independence of the Corporation;

         (ii) whether the proposed transaction might violate federal or state
      laws;

         (iii) not only the consideration being offered in the proposed
      transaction, in relation to the then current market price for the
      outstanding capital stock of the Corporation, but also to the market price
      for the capital stock of the Corporation over a period of years, the
      estimated price that might be achieved in a negotiated sale of the
      Corporation as a whole or in part or through orderly liquidation, the
      premiums over market price for the securities of other corporations in
      similar transactions, current political, economic and other factors
      bearing on securities prices and the Corporation's financial condition and
      future prospects; and

         (iv) the social, legal and economic effects upon employees, suppliers,
      customers, creditors and others having similar relationships with the
      Corporation, upon the communities in which the Corporation conducts its
      business and upon the economy of the state, region and nation.

In connection with any such evaluation, the Board of Directors is authorized to
conduct such investigations and engage in such legal proceedings as the Board of
Directors may determine.

         TENTH.


                                      -5-


<PAGE>   6

         1.       ACTIONS, SUITS AND PROCEEDINGS OTHER THAN BY OR IN THE RIGHT
OF THE CORPORATION. The Corporation shall indemnify each person who was or is a
party or is threatened to be made a party to any threatened, pending or
completed action, suit or proceeding, whether civil, criminal, administrative or
investigative (other than an action by or in the right of the Corporation), by
reason of the fact that he is or was, or has agreed to become, a director or
officer of the Corporation, or is or was serving, or has agreed to serve, at the
request of the Corporation, as a director, officer or trustee of, or in a
similar capacity with, another corporation, partnership, joint venture, trust or
other enterprise (including any employee benefit plan) (all such persons being
referred to hereafter as an "INDEMNITEE"), or by reason of any action alleged to
have been taken or omitted in such capacity, against all expenses (including
attorneys' fees), judgments, fines and amounts paid in settlement actually and
reasonably incurred by him or on his behalf in connection with such action, suit
or proceeding and any appeal therefrom, if he acted in good faith and in a
manner he reasonably believed to be in, or not opposed to, the best interests of
the Corporation, and, with respect to any criminal action or proceeding, had no
reasonable cause to believe his conduct was unlawful. The termination of any
action, suit or proceeding by judgment, order, settlement, conviction or upon a
plea of NOLO CONTENDERE or its equivalent, shall not, of itself, create a
presumption that the person did not act in good faith and in a manner which he
reasonably believed to be in, or not opposed to, the best interests of the
Corporation, and, with respect to any criminal action or proceeding, had
reasonable cause to believe that his conduct was unlawful. Notwithstanding
anything to the contrary in this Article, except as set forth in Section 6
below, the Corporation shall not indemnify an Indemnitee seeking indemnification
in connection with a proceeding (or part thereof) initiated by the Indemnitee
unless the initiation thereof was approved by the Board of Directors of the
Corporation.

         2.       ACTIONS OR SUITS BY OR IN THE RIGHT OF THE CORPORATION. The
Corporation shall indemnify any Indemnitee who was or is a party or is
threatened to be made a party to any threatened, pending or completed action or
suit by or in the right of the Corporation to procure a judgment in its favor by
reason of the fact that he is or was, or has agreed to become, a director or
officer of the Corporation, or is or was serving, or has agreed to serve, at the
request of the Corporation, as a director, officer or trustee of, or in a
similar capacity with, another corporation, partnership, joint venture, trust or
other enterprise (including any employee benefit plan), or by reason of any
action alleged to have been taken or omitted in such capacity, against all
expenses (including attorneys' fees) and amounts paid in settlement actually and
reasonably incurred by him or on his behalf in connection with such action, suit
or proceeding and any appeal therefrom, if he acted in good faith and in a
manner he reasonably believed to be in, or not opposed to, the best interests of
the Corporation, except that no indemnification shall be made in respect of any
claim, issue or matter as to which such person shall have been adjudged to be
liable to the Corporation unless and only to the extent that the Court of
Chancery of Delaware or the court in which such action or suit was brought shall
determine upon application that, despite the adjudication of such liability but
in view of all the circumstances of the case, such person is fairly and
reasonably entitled to indemnity for such expenses (including attorneys' fees)
which the Court of Chancery of Delaware or such other court shall deem proper.


                                      -6-



<PAGE>   7

         3.       INDEMNIFICATION FOR EXPENSES OF SUCCESSFUL PARTY.
Notwithstanding the other provisions of this Article, to the extent that an
Indemnitee has been successful, on the merits or otherwise, in defense of any
action, suit or proceeding referred to in Sections 1 and 2 of this Article, or
in defense of any claim, issue or matter therein, or on appeal from any such
action, suit or proceeding, he shall be indemnified against all expenses
(including attorneys' fees) actually and reasonably incurred by him or on his
behalf in connection therewith. Without limiting the foregoing, if any action,
suit or proceeding is disposed of, on the merits or otherwise (including a
disposition without prejudice), without (i) the disposition being adverse to the
Indemnitee, (ii) an adjudication that the Indemnitee was liable to the
Corporation, (iii) a plea of guilty or nolo CONTENDERE by the Indemnitee, (iv)
an adjudication that the Indemnitee did not act in good faith and in a manner he
reasonably believed to be in or not opposed to the best interests of the
Corporation, and (v) with respect to any criminal proceeding, an adjudication
that the Indemnitee had reasonable cause to believe his conduct was unlawful,
the Indemnitee shall be considered for the purpose hereof to have been wholly
successful with respect thereto.

         4.       NOTIFICATION AND DEFENSE OF CLAIM. As a condition precedent to
his right to be indemnified, the Indemnitee must notify the Corporation in
writing as soon as practicable of any action, suit, proceeding or investigation
involving him for which indemnity will or could be sought. With respect to any
action, suit, proceeding or investigation of which the Corporation is so
notified, the Corporation will be entitled to participate therein at its own
expense and/or to assume the defense thereof at its own expense, with legal
counsel reasonably acceptable to the Indemnitee. After notice from the
Corporation to the Indemnitee of its election so to assume such defense, the
Corporation shall not be liable to the Indemnitee for any legal or other
expenses subsequently incurred by the Indemnitee in connection with such claim,
other than as provided below in this Section 4. The Indemnitee shall have the
right to employ his own counsel in connection with such claim, but the fees and
expenses of such counsel incurred after notice from the Corporation of its
assumption of the defense thereof shall be at the expense of the Indemnitee
unless (i) the employment of counsel by the Indemnitee has been authorized by
the Corporation, (ii) counsel to the Indemnitee shall have reasonably concluded
that there may be a conflict of interest or position on any significant issue
between the Corporation and the Indemnitee in the conduct of the defense of such
action or (iii) the Corporation shall not in fact have employed counsel to
assume the defense of such action, in each of which cases the fees and expenses
of counsel for the Indemnitee shall be at the expense of the Corporation, except
as otherwise expressly provided by this Article. The Corporation shall not be
entitled, without the consent of the Indemnitee, to assume the defense of any
claim brought by or in the right of the Corporation or as to which counsel for
the Indemnitee shall have reasonably made the conclusion provided for in clause
(ii) above.

         5.       ADVANCE OF EXPENSES. Subject to the provisions of Section 6
below, in the event that the Corporation does not assume the defense pursuant to
Section 4 of this Article of any action, suit, proceeding or investigation of
which the Corporation receives notice under this Article, any expenses
(including attorneys' fees) incurred by an Indemnitee in defending a civil or
criminal action, suit, proceeding or investigation or any appeal therefrom shall
be paid by the Corporation in advance of the final disposition of such 


                                      -7-



<PAGE>   8

matter, PROVIDED, HOWEVER, that the payment of such expenses incurred by an
Indemnitee in advance of the final disposition of such matter shall be made only
upon receipt of an undertaking by or on behalf of the Indemnitee to repay all
amounts so advanced in the event that it shall ultimately be determined that the
indemnitee is not entitled to be indemnified by the Corporation as authorized in
this Article. Such undertaking may be accepted without reference to the
financial ability of such person to make such repayment.

         6.       PROCEDURE FOR INDEMNIFICATION. In order to obtain
indemnification or advancement of expenses pursuant to Section 1, 2, 3 or 5 of
this Article, the Indemnitee shall submit to the Corporation a written request,
including in such request such documentation and information as is reasonably
available to the Indemnitee and is reasonably necessary to determine whether and
to what extent the Indemnitee is entitled to indemnification or advancement of
expenses. Any such indemnification or advancement of expenses shall be made
promptly, and in any event within 60 days after receipt by the Corporation of
the written request of the Indemnitee, unless with respect to requests under
Section 1, 2 or 5 the Corporation determines, by clear and convincing evidence,
within such 60-day period that the Indemnitee did not meet the applicable
standard of conduct set forth in Section 1 or 2, as the case may be. Such
determination shall be made in each instance by (a) a majority vote of the
directors of the Corporation who are not at that time parties to the action,
suit or proceeding in question ("disinterested directors"), even though less
than a quorum, (b) if there are no such disinterested directors, or if such
disinterested directors so direct, by independent legal counsel (who may be
regular legal counsel to the corporation) in a written opinion, (c) a majority
vote of a quorum of the outstanding shares of stock of all classes entitled to
vote for directors, voting as a single class, which quorum shall consist of
stockholders who are not at that time parties to the action, suit or proceeding
in question, or (d) a court of competent jurisdiction.

         7.       REMEDIES. The right to indemnification or advances as granted
by this Article shall be enforceable by the Indemnitee in any court of competent
jurisdiction if the Corporation denies such request, in whole or in part, or if
no disposition thereof is made within the 60-day period referred to above in
Section 6. Unless otherwise provided by law, the burden of proving that the
Indemnitee is not entitled to indemnification or advancement of expenses under
this Article shall be on the Corporation. Neither the failure of the Corporation
to have made a determination prior to the commencement of such action that
indemnification is proper in the circumstances because the Indemnitee has met
the applicable standard of conduct, nor an actual determination by the
Corporation pursuant to Section 6 that the Indemnitee has not met such
applicable standard of conduct, shall be a defense to the action or create a
presumption that the Indemnitee has not met the applicable standard of conduct.
The Indemnitee's expenses (including attorneys' fees) incurred in connection
with successfully establishing his right to indemnification, in whole or in
part, in any such proceeding shall also be indemnified by the Corporation.

         8.       SUBSEQUENT AMENDMENT. No amendment, termination or repeal of
this Article or of the relevant provisions of the General Corporation Law of the
State of Delaware or any other applicable laws shall affect or diminish in any
way the rights of any Indemnitee to indemnification under the provisions hereof
with respect to any action, suit, proceeding or 


                                      -8-


<PAGE>   9

investigation arising out of or relating to any actions, transactions or facts
occurring prior to the final adoption of such amendment, termination or repeal.

         9.       OTHER RIGHTS. The indemnification and advancement of expenses
provided by this Article shall not be deemed exclusive of any other rights to
which an Indemnitee seeking indemnification or advancement of expenses may be
entitled under any law (common or statutory), agreement or vote of stockholders
or disinterested directors or otherwise, both as to action in his official
capacity and as to action in any other capacity while holding office for the
Corporation, and shall continue as to an Indemnitee who has ceased to be a
director or officer, and shall inure to the benefit of the estate, heirs,
executors and administrators of the Indemnitee. Nothing contained in this
Article shall be deemed to prohibit, and the Corporation is specifically
authorized to enter into, agreements with officers and directors providing
indemnification rights and procedures different from those set forth in this
Article. In addition, the Corporation may, to the extent authorized from time to
time by its Board of Directors, grant indemnification rights to other employees
or agents of the Corporation or other persons serving the Corporation and such
rights may be equivalent to, or greater or less than, those set forth in this
Article.

         10.      PARTIAL INDEMNIFICATION. If an Indemnitee is entitled under
any provision of this Article to indemnification by the Corporation for some or
a portion of the expenses (including attorneys' fees), judgments, fines or
amounts paid in settlement actually and reasonably incurred by him or on his
behalf in connection with any action, suit, proceeding or investigation and any
appeal therefrom but not, however, for the total amount thereof, the Corporation
shall nevertheless indemnify the Indemnitee for the portion of such expenses
(including attorneys' fees), judgments, fines or amounts paid in settlement to
which the Indemnitee is entitled.

         11.      INSURANCE. The Corporation may purchase and maintain
insurance, at its expense, to protect itself and any director, officer, employee
or agent of the Corporation or another corporation, partnership, joint venture,
trust or other enterprise (including any employee benefit plan) against any
expense, liability or loss incurred by him in any such capacity, or arising out
of his status as such, whether or not the Corporation would have the power to
indemnify such person against such expense, liability or loss under the General
Corporation Law of the State of Delaware.

         12.      MERGER OR CONSOLIDATION. If the Corporation is merged into or
consolidated with another corporation and the Corporation is not the surviving
corporation, the surviving corporation shall assume the obligations of the
Corporation under this Article with respect to any action, suit, proceeding or
investigation arising out of or relating to any actions, transactions or facts
occurring prior to the date of such merger or consolidation.

         13.      SAVINGS CLAUSE. If this Article or any portion hereof shall be
invalidated on any ground by any court of competent jurisdiction, then the
Corporation shall nevertheless indemnify each Indemnitee as to any expenses
(including attorneys' fees), judgments, fines and amounts paid in settlement in
connection with any action, suit, proceeding or investigation, whether civil,
criminal or administrative, including an action by or in the right of the
Corporation, to the fullest 




                                      -9-



<PAGE>   10

extent permitted by an applicable portion of this Article that shall not have
been invalidated and to the fullest extent permitted by applicable law.

         14.      DEFINITIONS. Terms used herein and defined in Section 145(h)
and Section 145(i) of the General Corporation Law of the State of Delaware shall
have the respective meanings assigned to such terms in such Section 145(h) and
Section 145(i).

         15.      SUBSEQUENT LEGISLATION. If the General Corporation Law of the
State of Delaware is amended after adoption of this Article to expand further
the indemnification permitted to Indemnitees, then the Corporation shall
indemnify such persons to the fullest extent permitted by the General
Corporation Law of the State of Delaware, as so amended.

         ELEVENTH. The Corporation reserves the right to amend or repeal any
provision contained in this Second Amended and Restated Certificate of
Incorporation in the manner prescribed by the laws of the State of Delaware and
all rights conferred upon stockholders are granted subject to this reservation,
PROVIDED, HOWEVER, that in addition to any vote of the holders of any class or
series of stock of the Corporation required by law, this Second Amended and
Restated Certificate of Incorporation or a Certificate of Designation with
respect to a series of Preferred Stock, the affirmative vote of the holders of
shares of voting stock of the Corporation representing at least seventy-five
percent (75%) of the voting power of all of the then outstanding shares of the
capital stock of the Corporation entitled to vote generally in the election of
directors, voting together as a single class, shall be required to (i) reduce or
eliminate the number of authorized shares of Common Stock or the number of
authorized shares of Preferred Stock set forth in Article FOURTH or (ii) amend
or repeal, or adopt any provision inconsistent with, Parts A and B of Article
FOURTH and Articles FIFTH, SIXTH, SEVENTH, EIGHTH, NINTH, TENTH and this Article
ELEVENTH of this Second Amended and Restated Certificate of Incorporation.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]




                                      -10-
<PAGE>   11



         IN WITNESS WHEREOF, the undersigned has hereunto signed his name and
affirms that the statements made in this Second Amended and Restated Certificate
of Incorporation are true under the penalties of perjury this ____ day of
______________, 1999.



                                    ------------------------------
                                    Daniel J. Schimmel
                                    President








                                      -11-

<PAGE>   1
                                                                    EXHIBIT 3.04



                           SECOND AMENDED AND RESTATED

                                     BY-LAWS

                                       OF

                      ONESOURCE INFORMATION SERVICES, INC.
























Dated:  ____________, 1999


<PAGE>   2




                                     BY-LAWS

                                TABLE OF CONTENTS

ARTICLE 1 - STOCKHOLDERS.......................................................1
- ---------

   1.1 PLACE OF MEETINGS.......................................................1
   1.2 ANNUAL MEETING..........................................................1
   1.3 SPECIAL MEETINGS........................................................1
   1.4 NOTICE OF MEETINGS......................................................1
   1.5 VOTING LIST.............................................................1
   1.6 QUORUM..................................................................2
   1.7 ADJOURNMENTS............................................................2
   1.8 VOTING AND PROXIES......................................................2
   1.9 ACTION AT MEETING.......................................................3
   1.10 INTRODUCTION OF BUSINESS AT MEETINGS...................................3
   1.11 ACTION WITHOUT MEETING.................................................6

ARTICLE 2 - DIRECTORS..........................................................6
- ---------

   2.1 GENERAL POWERS..........................................................6
   2.2 NUMBER; ELECTION AND QUALIFICATION......................................7
   2.3 TERMS IN OFFICE.........................................................7
   2.4 TENURE..................................................................7
   2.5 VACANCIES...............................................................7
   2.6 RESIGNATION.............................................................7
   2.7 REGULAR MEETINGS........................................................8
   2.8 SPECIAL MEETINGS........................................................8
   2.9 NOTICE OF SPECIAL MEETINGS..............................................8
   2.10 MEETINGS BY TELEPHONE CONFERENCE CALLS.................................8
   2.11 QUORUM.................................................................8
   2.12 ACTION AT MEETING......................................................9
   2.13 ACTION BY WRITTEN CONSENT..............................................9
   2.14 REMOVAL................................................................9
   2.15 COMMITTEES.............................................................9
   2.16 COMPENSATION OF DIRECTORS..............................................9
   2.17 AMENDMENTS TO ARTICLE.................................................10

ARTICLE 3 - OFFICERS..........................................................10
- ---------

   3.1 ENUMERATION............................................................10
   3.2 ELECTION...............................................................10
   3.3 QUALIFICATION..........................................................10
   3.4 TENURE.................................................................10
   3.5 RESIGNATION AND REMOVAL................................................10
   3.6 VACANCIES..............................................................11
   3.7 CHAIRMAN OF THE BOARD AND VICE-CHAIRMAN OF THE BOARD...................11


<PAGE>   3
                                      -ii-


   3.8 PRESIDENT..............................................................11
   3.9 VICE PRESIDENTS........................................................11
   3.10 SECRETARY AND ASSISTANT SECRETARIES...................................11
   3.11 TREASURER AND ASSISTANT TREASURERS....................................12
   3.12 SALARIES..............................................................12
   3.13 ACTION WITH RESPECT TO SECURITIES OF OTHER CORPORATIONS...............12

ARTICLE 4 - CAPITAL STOCK.....................................................13
- ---------

   4.1 ISSUANCE OF STOCK......................................................13
   4.2 CERTIFICATES OF STOCK..................................................13
   4.3 TRANSFERS..............................................................13
   4.4 LOST, STOLEN OR DESTROYED CERTIFICATES.................................13
   4.5 RECORD DATE............................................................14

ARTICLE 5 - GENERAL PROVISIONS................................................14
- ---------

   5.1 FISCAL YEAR............................................................14
   5.2 CORPORATE SEAL.........................................................14
   5.3 NOTICES................................................................14
   5.4 WAIVER OF NOTICE.......................................................14
   5.5 EVIDENCE OF AUTHORITY..................................................15
   5.6 FACSIMILE SIGNATURES...................................................15
   5.7 RELIANCE UPON BOOKS, REPORTS AND RECORDS...............................15
   5.8 TIME PERIODS...........................................................15
   5.9 CERTIFICATE OF INCORPORATION...........................................15
   5.10 TRANSACTIONS WITH INTERESTED PARTIES..................................15
   5.11 SEVERABILITY..........................................................16
   5.12 PRONOUNS..............................................................16

ARTICLE 6 - AMENDMENTS........................................................16
- ---------

   6.1 BY THE BOARD OF DIRECTORS..............................................16
   6.2 BY THE STOCKHOLDERS....................................................16


<PAGE>   4




                           SECOND AMENDED AND RESTATED

                                     BY-LAWS

                                       OF

            ONESOURCE INFORMATION SERVICES, INC. (the "CORPORATION")

                            ARTICLE 1 - STOCKHOLDERS

         1.1      PLACE OF MEETINGS. All meetings of stockholders shall be held
at such place within or without the State of Delaware as may be designated from
time to time by the Chairman of the Board (if any), the board of directors of
the Corporation (the "BOARD OF DIRECTORS") or the President or, if not so
designated, at the registered office of the Corporation.

         1.2      ANNUAL MEETING. The annual meeting of stockholders for the
election of directors and for the transaction of such other business as may
properly be brought before the meeting shall be held on a date to be fixed by
the Chairman of the Board (if any), Board of Directors or the President (which
date shall not be a legal holiday in the place where the meeting is to be held)
at the time and place to be fixed by the Chairman of the Board, the Board of
Directors or the President and stated in the notice of the meeting.

         1.3      SPECIAL MEETINGS. Special meetings of stockholders may be
called at any time by the Chairman of the Board (if any), a majority of the
Board of Directors or the President and shall be held at such place, on such
date and at such time as shall be fixed by the Board of Directors or the person
calling the meeting. Business transacted at any special meeting of stockholders
shall be limited to matters relating to the purpose or purposes stated in the
notice of meeting.

         1.4      NOTICE OF MEETINGS. Except as otherwise provided by law,
written notice of each meeting of stockholders, whether annual or special, shall
be given not less than 10 nor more than 60 days before the date of the meeting
to each stockholder entitled to vote at such meeting. The notices of all
meetings shall state the place, date and hour of the meeting. The notice of a
special meeting shall state, in addition, the purpose or purposes for which the
meeting is called. If mailed, notice is given when deposited in the United
States mail, postage prepaid, directed to the stockholder at his or her address
as it appears on the records of the Corporation.

         1.5      VOTING LIST. The officer who has charge of the stock ledger of
the Corporation shall prepare, at least 10 days before every meeting of
stockholders, a complete list of the stockholders entitled to vote at the
meeting, arranged in alphabetical order, and showing the address of each
stockholder and the number of shares registered in the name of each stockholder.
Such list shall be open to the examination of any stockholder, for any purpose
germane to the meeting, during ordinary business hours, for a period of at least
10 days prior to the meeting, 




<PAGE>   5
                                      -2-


either at a place within the city where the meeting is to be held, which place
shall be specified in the notice of the meeting, or if not so specified, at the
place where the meeting is to be held. The list shall also be produced and kept
at the time and place of the meeting during the whole time of the meeting, and
may be inspected by any stockholder who is present. This list shall
presumptively determine the identity of the stockholders entitled to vote at the
meeting and the number of shares held by each of them.

         1.6      QUORUM. Except as otherwise provided by law, the Certificate
of Incorporation or these By-Laws, the holders of a majority of the shares of
the capital stock of the Corporation issued and outstanding and entitled to vote
at the meeting, present in person or represented by proxy, shall constitute a
quorum for the transaction of business. Shares held by brokers which such
brokers are prohibited from voting (pursuant to their discretionary authority on
behalf of beneficial owners of such shares who have not submitted a proxy with
respect to such shares) on some or all of the matters before the stockholders,
but which shares would otherwise be entitled to vote at the meeting ("BROKER
NON-VOTES") shall be counted, for the purpose of determining the presence or
absence of a quorum, both (a) toward the total voting power of the shares of
capital stock of the Corporation and (b) as being represented by proxy. If a
quorum has been established for the purpose of conducting the meeting, a quorum
shall be deemed to be present for the purpose of all votes to be conducted at
such meeting, provided that where a separate vote by a class or classes, or
series thereof, is required, a majority of the voting power of the shares of
such class or classes, or series, present in person or represented by proxy
shall constitute a quorum entitled to take action with respect to that vote on
that matter. If a quorum shall fail to attend any meeting, the chairman of the
meeting or the holders of a majority of the voting power of the shares of stock
entitled to vote who are present, in person or by proxy, may adjourn the meeting
to another place, date, or time.

         1.7      ADJOURNMENTS. Any meeting of stockholders may be adjourned to
any other time and to any other place at which a meeting of stockholders may be
held under these By-Laws by the stockholders present or represented at the
meeting and entitled to vote, although less than a quorum, or, if no stockholder
is present, by any officer entitled to preside at or to act as Secretary of such
meeting. It shall not be necessary to notify any stockholder of any adjournment
of less than 30 days if the time and place of the adjourned meeting are
announced at the meeting at which adjournment is taken, unless after the
adjournment a new record date is fixed for the adjourned meeting. At the
adjourned meeting, the Corporation may transact any business which might have
been transacted at the original meeting.

         1.8      VOTING AND PROXIES. At any meeting of the stockholders, each
stockholder shall have one vote for each share of stock entitled to vote at such
meeting held of record by such stockholder and a proportionate vote for each
fractional share so held, unless otherwise provided in the Certificate of
Incorporation. Each stockholder of record entitled to vote at a meeting of
stockholders, or to express consent or dissent to corporate action in writing
without a meeting (to the extent not otherwise prohibited by the Certificate of
Incorporation or these By-laws), may vote or express such consent or dissent in
person or may authorize another person or persons to vote or act for such
stockholder by written proxy executed by such stockholder or his or her
<PAGE>   6
                                      -3-


authorized agent or by a transmission permitted by law and delivered to the
Secretary of the Corporation. No such proxy shall be voted or acted upon after
three years from the date of its execution, unless the proxy expressly provides
for a longer period. Any copy, facsimile telecommunication or other reliable
reproduction of the writing or transmission created pursuant to this Section 1.8
may be substituted or used in lieu of the original writing or transmission for
any and all purposes for which the original writing or transmission could be
used, provided that such copy, facsimile telecommunication or reproduction shall
be a complete reproduction of the entire original writing or transmission.

         All voting, including on the election of directors but excepting where
otherwise required by law or the Certificate of Incorporation, may take place
via a voice vote. Any vote not taken by voice shall be taken by ballots, each of
which shall state the name of the stockholder or proxy voting and such other
information as may be required under the procedure established for the meeting.

         1.9      ACTION AT MEETING. When a quorum is present at any meeting of
stockholders, the holders of a majority of the stock present or represented and
voting on a matter (or if there are two or more classes of stock entitled to
vote as separate classes, then in the case of each such class, the holders of a
majority of the stock of that class present or represented and voting on such
matter) shall decide any matter to be voted upon by the stockholders at such
meeting (other than the election of directors), except when a different vote is
required by express provision of law, the Certificate of Incorporation or these
By-Laws. Any election of directors by the stockholders shall be determined by a
plurality of the votes cast by the stockholders entitled to vote at such
election, except as otherwise provided by the Certificate of Incorporation. For
the purposes of this paragraph, Broker Non-Votes represented at the meeting but
not permitted to vote on a particular matter shall not be counted, with respect
to the vote on such matter, in the number of (a) votes cast, (b) votes cast
affirmatively, or (c) votes cast negatively.

         1.10     INTRODUCTION OF BUSINESS AT MEETINGS.

                  A.       ANNUAL MEETINGS OF STOCKHOLDERS.

                           (1) Nominations of persons for election to the Board
              of Directors and the proposal of business to be considered by the
              stockholders may be made at an annual meeting of stockholders (a)
              pursuant to the Corporation's notice of meeting, (b) by or at the
              direction of the Board of Directors or (c) by any stockholder of
              the Corporation who was a stockholder of record at the time of
              giving of notice provided for in this Section 1.10, who is
              entitled to vote at the meeting and who complies with the notice
              procedures set forth in this Section 1.10.

                           (2) For nominations or other business to be properly
              brought before an annual meeting by a stockholder pursuant to
              clause (c) of paragraph (A)(1) of this Section 1.10, the
              stockholder must have given timely notice thereof in writing to
              the Secretary of the Corporation and such other business must
              otherwise be a proper 

<PAGE>   7
                                      -4-


              matter for stockholder action. To be timely, a stockholder's
              notice shall be delivered to the Secretary at the principal
              executive offices of the Corporation not later than the close of
              business on the one hundred twentieth (120th) day nor earlier than
              the close of business on the one hundred fiftieth (150th) day
              prior to the first anniversary of the date of the proxy statement
              delivered to stockholders in connection with the preceding year's
              annual meeting provided, however, that if either (i) the date of
              the annual meeting is more than thirty (30) days before or more
              than sixty (60) days after such an anniversary date or (ii) no
              proxy statement was delivered to stockholders in connection with
              the preceding year's annual meeting, notice by the stockholder to
              be timely must be so delivered not earlier than the close of
              business on the ninetieth (90th) day prior to such annual meeting
              and not later than the close of business on the later of the
              sixtieth (60th) day prior to such annual meeting or the close of
              business on the tenth (10th) day following the day on which public
              announcement of the date of such meeting is first made by the
              Corporation. Such stockholder's notice shall set forth (a) as to
              each person whom the stockholder proposes to nominate for election
              or reelection as a director, all information relating to such
              person that is required to be disclosed in solicitations of
              proxies for election of directors, or is otherwise required, in
              each case pursuant to Regulation 14A under the Securities Exchange
              Act of 1934, as amended (the "EXCHANGE ACT") (including such
              person's written consent to being named in the proxy statement as
              a nominee and to serving as a director if elected); (b) as to any
              other business that the stockholder proposes to bring before the
              meeting, a brief description of the business desired to be brought
              before the meeting, the reasons for conducting such business at
              the meeting and any material interest in such business of such
              stockholder and the beneficial owner, if any, on whose behalf the
              proposal is made; and (c) as to the stockholder giving the notice
              and the beneficial owner, if any, on whose behalf the nomination
              or proposal is made (i) the name and address of such stockholder,
              as they appear on the Corporation's books, and of such beneficial
              owner and (ii) the class and number of shares of capital stock of
              the Corporation that are owned beneficially and held of record by
              such stockholder and such beneficial owner.

                           (3) Notwithstanding anything in the second sentence
              of paragraph (A)(2) of this Section 1.10 to the contrary, in the
              event that the number of directors to be elected to the Board of
              Directors of the Corporation is increased and there is no public
              announcement by the Corporation naming all of the nominees for
              director or specifying the size of the increased Board of
              Directors at least seventy (70) days prior to the first
              anniversary of the preceding year's annual meeting (or, if the
              annual meeting is held more than thirty (30) days before or sixty
              (60) days after such anniversary date, at least seventy (70) days
              prior to such annual meeting), a stockholder's notice required by
              this Section 1.10 shall also be considered timely, but only with
              respect to nominees for any new positions created by such
              increase, if it shall be delivered to the Secretary at the
              principal executive office of the Corporation not later than the
              close of business on the tenth (10th) day following the day on
              which such public announcement is first made by the Corporation.


<PAGE>   8
                                      -5-


                  B.       SPECIAL MEETINGS OF STOCKHOLDERS. Only such business
              shall be conducted at a special meeting of stockholders as shall
              have been brought before the meeting pursuant to the Corporation's
              notice of meeting. Nominations of persons for election to the
              Board of Directors may be made at a special meeting of
              stockholders at which directors are to be elected pursuant to the
              Corporation's notice of meeting (a) by or at the direction of the
              Board of Directors or (b) provided that the Board of Directors has
              determined that directors shall be elected at such meeting, by any
              stockholder of the Corporation who is a stockholder of record at
              the time of giving of notice of the special meeting, who shall be
              entitled to vote at the meeting and who complies with the notice
              procedures set forth in this Section 1.10. If the Corporation
              calls a special meeting of stockholders for the purpose of
              electing one or more directors to the Board of Directors, any such
              stockholder may nominate a person or persons (as the case may be),
              for election to such position(s) as specified in the Corporation's
              notice of meeting, if the stockholder's notice required by
              paragraph (A)(2) of this Section 1.10 shall be delivered to the
              Secretary at the principal executive offices of the Corporation
              not earlier than the ninetieth (90th) day prior to such special
              meeting nor later than the later of (x) the close of business on
              the sixtieth (60th) day prior to such special meeting or (y) the
              close of business on the tenth (10th) day following the day on
              which public announcement is first made of the date of such
              special meeting and of the nominees proposed by the Board of
              Directors to be elected at such meeting.

         C.       GENERAL.

                           (1) Only such persons who are nominated in accordance
              with the procedures set forth in this Section 1.10 shall be
              eligible to serve as directors and only such business shall be
              conducted at a meeting of stockholders as shall have been brought
              before the meeting in accordance with the procedures set forth in
              this Section 1.10. Except as otherwise provided by law, the
              Certificate of Incorporation or these By-Laws, the chairman of the
              meeting shall have the power and duty to determine whether a
              nomination or any business proposed to be brought before the
              meeting was made or proposed, as the case may be, in accordance
              with the procedures set forth in this Section 1.10 and, if any
              proposed nomination or business is not in compliance herewith, to
              declare that such defective proposal or nomination shall be
              disregarded.

                           (2) For purposes of this Section 1.10, "public
              announcement" shall mean disclosure in a press release reported by
              the Dow Jones News Service, Associated Press or comparable
              national news service or in a document publicly filed by the
              Corporation with the Securities and Exchange Commission pursuant
              to Section 13, 14 or 15(d) of the Exchange Act.
<PAGE>   9
                                      -6-


                           (3) Notwithstanding the foregoing provisions of this
              Section 1.10, a stockholder shall also comply with all applicable
              requirements of the Exchange Act and the rules and regulations
              thereunder with respect to the matters set forth herein. Nothing
              in this Section 1.10 shall be deemed to affect any rights (i) of
              stockholders to request inclusion of proposals in the
              Corporation's proxy statement pursuant to Rule 14a-8 under the
              Exchange Act or (ii) of the holders of any series of Preferred
              Stock to elect directors under specified circumstances.

         1.11     ACTION WITHOUT MEETING. Any action required to be taken at any
annual or special meeting of stockholders, or any action which may be taken at
any annual or special meeting of such stockholders, may be taken without a
meeting, without prior notice and without a vote, if a consent or consents in
writing, setting forth the action so taken, shall be (1) signed and dated by the
holders of outstanding stock having not less than the minimum number of votes
that would be necessary to authorize or take such action at a meeting at which
all shares entitled to vote thereon were present and voted and (2) delivered to
the Corporation within sixty days of the earliest dated consent by delivery to
its registered office in the State of Delaware (in which case delivery shall be
by hand or by certified or registered mail, return receipt requested), its
principal place of business, or an officer or agent of the Corporation having
custody of the book in which proceedings of meetings of stockholders are
recorded. Prompt notice of the taking of the corporate action without a meeting
by less than unanimous written consent shall be given to those stockholders who
have not consented in writing.

                              ARTICLE 2 - DIRECTORS

         2.1      GENERAL POWERS. The business and affairs of the Corporation
shall be managed by or under the direction of a Board of Directors, who may
exercise all of the powers of the Corporation except as otherwise provided by
law or the Certificate of Incorporation. In the event of a vacancy in the Board
of Directors, the remaining directors, except as otherwise provided by law or
the Certificate of Incorporation, may exercise the powers of the full Board of
Directors until the vacancy is filled. Without limiting the foregoing, the Board
of Directors may:

         (a)      declare dividends from time to time in accordance with law;

         (b)      purchase or otherwise acquire any property, rights or 
      privileges on such terms as it shall determine;

         (c)      authorize the creation, making and issuance, in such form as 
      it may determine, of written obligations of every kind, negotiable or
      non-negotiable, secured or unsecured, to borrow funds and guarantee
      obligations, and to do all things necessary in connection therewith;

         (d)      remove any officer of the Corporation with or without cause,
      and from time to time devolve the powers and duties of any officer upon
      any other person for the time being;


<PAGE>   10
                                      -7-


         (e)      confer upon any officer of the Corporation the power to
      appoint, remove and suspend subordinate officers, employees and agents;

         (f)      adopt from time to time such stock option, stock purchase,
      bonus or other compensation plans for directors, officers, employees,
      consultants and agents of the Corporation and its subsidiaries as it may
      determine;

         (g)      adopt from time to time such insurance, retirement, and other
      benefit plans for directors, officers, employees, consultants and agents
      of the Corporation and its subsidiaries as it may determine; and

         (h)      adopt from time to time regulations, not inconsistent
      herewith, for the management of the Corporation's business and affairs.

         2.2      NUMBER; ELECTION AND QUALIFICATION. The number of directors
which shall constitute the whole Board of Directors shall be determined by
resolution of the Board of Directors, but in no event shall be less than three.
The number of directors may be decreased at any time and from time to time by a
majority of the directors then in office, but only to eliminate vacancies
existing by reason of the death, resignation, removal or expiration of the term
of one or more directors. The directors shall be elected at the annual meeting
of stockholders (or, if so determined by the Board of Directors pursuant to
Section 10 hereof, at a special meeting of stockholders), by such stockholders
as have the right to vote on such election. Directors need not be stockholders
of the Corporation.

         2.3      TERMS IN OFFICE. Each director shall serve for a term ending
on the date of the third annual meeting following the annual meeting at which
such director was elected.

         2.4      TENURE. Notwithstanding any provisions to the contrary
contained herein, each director shall hold office until his or her successor is
elected and qualified, or until his or her earlier death, resignation or
removal.

         2.5      VACANCIES. Unless and until filled by the stockholders, any
vacancy in the Board of Directors, however occurring, including a vacancy
resulting from an enlargement thereof, may be filled by vote of a majority of
the directors then in office, although less than a quorum, or by a sole
remaining director. A director elected to fill a vacancy shall be elected for
the unexpired term of his or her predecessor in office, if any, and a director
chosen to fill a position resulting from an increase in the number of directors
shall hold office until the next election of directors and until his or her
successor is elected and qualified, or until his or her earlier death,
resignation or removal.

         2.6      RESIGNATION. Any director may resign by delivering his or her
written resignation to the Corporation at its principal office or to the
President or Secretary. Such resignation shall 

<PAGE>   11
                                      -8-


be effective upon receipt unless it is specified to be effective at some other
time or upon the happening of some other event.

         2.7      REGULAR MEETINGS. Regular meetings of the Board of Directors
may be held without notice at such time and place, either within or without the
State of Delaware, as shall be determined from time to time by the Board of
Directors; provided that any director who is absent when such a determination is
made shall be given notice of the determination. A regular meeting of the Board
of Directors may be held without notice immediately after and at the same place
as the annual meeting of stockholders. Regular meetings of the Board of
Directors shall be held at such place or places, on such date or dates, and at
such time or times as shall have been established by the Board of Directors and
publicized among all directors. A notice of each regular meeting shall not be
required.

         2.8      SPECIAL MEETINGS. Special meetings of the Board of Directors
may be held at any time and place, within or without the State of Delaware,
designated in a call by the Chairman of the Board (if any), the President, two
or more directors, or by one director in the event that there is only a single
director in office.

         2.9      NOTICE OF SPECIAL MEETINGS. Notice of any special meeting of
directors shall be given to each director by the Secretary or by the officer or
one of the directors calling the meeting. Notice shall be duly given to each
director (i) by giving notice to such director in person, by electronic mail or
by telephone at least 48 hours in advance of the meeting, (ii) by sending a
telegram or delivering written notice by facsimile transmission or by hand, to
his or her last known business or home address at least 48 hours in advance of
the meeting, or (iii) by mailing written notice to his or her last known
business or home address at least 72 hours in advance of the meeting. A notice
or waiver of notice of a meeting of the Board of Directors need not specify the
purposes of the meeting.

         2.10     MEETINGS BY TELEPHONE CONFERENCE CALLS. Directors or any
members of any committee designated by the Board of Directors may participate in
a meeting of the Board of Directors or such committee by means of conference
telephone or similar communications equipment by means of which all persons
participating in the meeting can hear each other, and participation by such
means shall be deemed to constitute presence in person at such meeting.

         2.11     QUORUM. A majority of the total number of the whole Board of
Directors shall constitute a quorum at all meetings of the Board of Directors.
In the event one or more of the directors shall be disqualified to vote at any
meeting, then the required quorum shall be reduced by one for each such director
so disqualified; provided, however, that in no case shall less than one-third
(1/3) of the total number of the whole Board of Directors constitute a quorum.
In the absence of a quorum at any such meeting, a majority of the directors
present may adjourn the meeting from time to time without further notice other
than announcement at the meeting, until a quorum shall be present.


<PAGE>   12
                                      -9-


         2.12     ACTION AT MEETING. At any meeting of the Board of Directors at
which a quorum is present, the vote of a majority of those present shall be
sufficient to take any action, unless a different vote is specified by law, the
Certificate of Incorporation or these By-Laws.

         2.13     ACTION BY WRITTEN CONSENT. Any action required or permitted to
be taken at any meeting of the Board of Directors or of any committee of the
Board of Directors may be taken without a meeting, if all members of the Board
of Directors or committee, as the case may be, consent to such action in
writing, and the written consents are filed with the minutes of proceedings of
the Board of Directors or committee.

         2.14     REMOVAL. Unless otherwise provided in the Certificate of
Incorporation, any one or more or all of the directors may be removed, without
cause, by the holders of at least seventy-five percent (75%) of the shares then
entitled to vote at an election of directors.

         2.15     COMMITTEES. The Board of Directors may, by resolution passed
by a majority of the whole Board, designate one or more committees, each
committee to consist of one or more of the directors of the Corporation. The
Board of Directors may designate one or more directors as alternate members of
any committee, who may replace any absent or disqualified member at any meeting
of such committee. In the absence or disqualification of a member of a
committee, the member or members of such committee present at any meeting and
not disqualified from voting, whether or not such member or members constitute a
quorum, may unanimously appoint another member of the Board of Directors to act
at such meeting in the place of any such absent or disqualified member. Any such
committee, to the extent provided in the resolution of the Board of Directors
and subject to the provisions of the General Corporation Law of the State of
Delaware, shall have and may exercise all the powers and authority of the Board
of Directors in the management of the business and affairs of the Corporation
and may authorize the seal of the Corporation to be affixed to all papers which
may require it. Each such committee shall keep minutes and make such reports as
the Board of Directors may from time to time request. Except as the Board of
Directors may otherwise determine or as provided herein, any committee may make
rules for the conduct of its business, but unless otherwise provided by the
directors or in such rules, its business shall be conducted as nearly as
possible in the same manner as is provided in these By-Laws for the Board of
Directors. Adequate provisions shall be made for notice to members of all
meeting of committees. One-third (1/3) of the members of any committee shall
constitute a quorum unless the committee shall consist of one (1) or two (2)
members, in which event one (1) member shall constitute a quorum; and all
matters shall be determined by a majority vote of the members present. Action
may be taken by any committee without a meeting if all members thereof consent
thereto in writing, and the writing or writings are filed with the minutes of
the proceedings of such committee.

         2.16     COMPENSATION OF DIRECTORS. Directors may be paid such
compensation for their services and such reimbursement for expenses of
attendance at meetings as the Board of Directors may from time to time
determine. No such payment shall preclude any director from serving the
Corporation or any of its parent or subsidiary corporations in any other
capacity and receiving compensation for such service.


<PAGE>   13
                                      -10-


         2.17     AMENDMENTS TO ARTICLE. Notwithstanding any other provisions of
law, the Certificate of Incorporation or these By-Laws, and notwithstanding the
fact that a lesser percentage may be specified by law, the affirmative vote of
the holders of a least seventy-five percent (75%) of the votes which all the
stockholders would be entitled to cast at any annual election of directors or
class of directors shall be required to amend or repeal, or to adopt any
provision inconsistent with, this Article 2.


                              ARTICLE 3 - OFFICERS


         3.1      ENUMERATION. The officers of the Corporation shall consist of
a President, a Secretary, a Treasurer and such other officers with such other
titles as the Board of Directors shall determine, including, but not limited to,
a Chairman of the Board, a Vice-Chairman of the Board, and one or more Vice
Presidents, Assistant Treasurers and Assistant Secretaries. The Board of
Directors may appoint such other officers as it may deem appropriate.

         3.2      ELECTION. The President, Treasurer and Secretary shall be
elected annually by the Board of Directors at its first meeting following the
annual meeting of stockholders. Other officers may be appointed by the Board of
Directors at such meeting or at any other meeting.

         3.3      QUALIFICATION.  No officer need be a stockholder. Any two or 
more offices may be held by the same person.

         3.4      TENURE. Except as otherwise provided by law, by the
Certificate of Incorporation or by these By-Laws, each officer shall hold office
until his or her successor is elected and qualified, unless a different term is
specified in the vote choosing or appointing such officer, or until his or her
earlier death, resignation or removal.

         3.5      RESIGNATION AND REMOVAL. Any officer may resign by delivering
his or her written resignation to the Chairman of the Board (if any), to the
Board of Directors at a meeting thereof, to the Corporation at its principal
office or to the President or Secretary. Such resignation shall be effective
upon receipt unless it is specified to be effective at some other time or upon
the happening of some other event.

         Any officer may be removed at any time, with or without cause, by vote
of a majority of the entire number of directors then in office.

         Except as the Board of Directors may otherwise determine, no officer
who resigns or is removed shall have any right to any compensation as an officer
for any period following the effective date of his or her resignation or
removal, or any right to damages on account of such removal, whether his or her
compensation be by the month or by the year or otherwise, unless 




<PAGE>   14
                                      -11-


such compensation is expressly provided in a duly authorized written agreement
with the Corporation.

         3.6      VACANCIES. The Board of Directors may fill any vacancy
occurring in any office for any reason and may, in its discretion, leave
unfilled for such period as it may determine any offices other than those of
President, Treasurer and Secretary. Each such successor shall hold office for
the unexpired term of his predecessor and until his or her successor is elected
and qualified, or until his or her earlier death, resignation or removal.

         3.7      CHAIRMAN OF THE BOARD AND VICE-CHAIRMAN OF THE BOARD. The
Chairman of the Board, if any, shall preside at all meetings of the Board of
Directors and stockholders at which he or she is present and shall perform such
duties and possess such powers as are designated by the Board of Directors. If
the Board of Directors appoints a Vice-Chairman of the Board, he or she shall,
in the absence or disability of the Chairman of the Board, perform the duties
and exercise the powers of the Chairman of the Board and shall perform such
other duties and possess such other powers as may from time to time be
designated by the Board of Directors.

         3.8      PRESIDENT. The President shall, subject to the direction of
the Board of Directors, have general charge and supervision of the business of
the Corporation. Unless otherwise provided by the Board of Directors, and
provided that there is no Chairman of the Board or that the Chairman and
Vice-Chairman, if any, are not available, the President shall preside at all
meetings of the stockholders, and, if a director, at all meetings of the Board
of Directors. Unless the Board of Directors has designated another officer as
the Chief Executive Officer, the President shall be the Chief Executive Officer
of the Corporation. The President shall perform such other duties and shall have
such other powers as the Board of Directors may from time to time prescribe. The
President shall have the power to enter into contracts and otherwise bind the
Corporation in matters arising in the ordinary course of the Corporation's
business.

         3.9      VICE PRESIDENTS. Any Vice President shall perform such duties
and possess such powers as the Board of Directors or the President may from time
to time prescribe. In the event of the absence, inability or refusal to act of
the President, the Vice President (or if there shall be more than one, the Vice
Presidents in the order determined by the Board of Directors) shall perform the
duties of the President and, when so performing, shall have all the powers of
and be subject to all the restrictions upon the President. The Board of
Directors may assign to any Vice President the title of Executive Vice
President, Senior Vice President or any other title selected by the Board of
Directors. Unless otherwise determined by the Board of Directors, any Vice
President shall have the power to enter into contracts and otherwise bind the
Corporation in matters arising in the ordinary course of the Corporation's
business.

         3.10     SECRETARY AND ASSISTANT SECRETARIES. The Secretary shall
perform such duties and shall have such powers as the Board of Directors or the
President may from time to time prescribe. In addition, the Secretary shall
perform such duties and have such powers as are incident to the office of
secretary, including without limitation, the duty and power to give notices of
all meetings of stockholders and special meetings of the Board of Directors, to
attend 




<PAGE>   15
                                      -12-


all meetings of stockholders and the Board of Directors and keep a record of the
proceedings, to maintain a stock ledger and prepare lists of stockholders and
their addresses as required, to be custodian of corporate records and the
corporate seal and to affix and attest to the same on documents.

         Any Assistant Secretary shall perform such duties and possess such
powers as the Board of Directors, the President or the Secretary may from time
to time prescribe. In the event of the absence, inability or refusal to act of
the Secretary, the Assistant Secretary (or if there shall be more than one, the
Assistant Secretaries in the order determined by the Board of Directors) shall
perform the duties and exercise the powers of the Secretary.

         In the absence of the Secretary or any Assistant Secretary at any
meeting of stockholders or directors, the person presiding at the meeting shall
designate a temporary secretary to keep a record of the meeting.

         3.11     TREASURER AND ASSISTANT TREASURERS. The Treasurer shall
perform such duties and shall have such powers as the Board of Directors or the
President may from time to time prescribe. In addition, the Treasurer shall
perform such duties and have such powers as are incident to the office of
treasurer, including without limitation the duty and power to keep and be
responsible for all funds and securities of the Corporation, to deposit funds of
the Corporation in depositories selected in accordance with these By-Laws, to
disburse such funds as ordered by the Board of Directors, to make proper
accounts for such funds, and to render as required by the Board of Directors
statements of all such transactions and of the financial condition of the
Corporation.

         The Assistant Treasurers shall perform such duties and possess such
powers as the Board of Directors, the President or the Treasurer may from time
to time prescribe. In the event of the absence, inability or refusal to act of
the Treasurer, the Assistant Treasurer (or if there shall be more than one, the
Assistant Treasurers in the order determined by the Board of Directors) shall
perform the duties and exercise the powers of the Treasurer.

         3.12     SALARIES. Officers of the Corporation shall be entitled to
such salaries, compensation or reimbursement as shall be fixed or allowed from
time to time by the Board of Directors.

         3.13     ACTION WITH RESPECT TO SECURITIES OF OTHER CORPORATIONS.
Unless otherwise directed by the Board of Directors, the President or any
officer of the Corporation authorized by the President shall have power to vote
and otherwise act on behalf of the Corporation, in person or by proxy, at any
meeting of stockholders of or with respect to any action of stockholders of any
other corporation in which the Corporation may hold securities and otherwise to
exercise any and all rights and powers which this Corporation may possess by
reason of its ownership of securities in such other corporation.
<PAGE>   16
                                      -13-


                            ARTICLE 4 - CAPITAL STOCK

         4.1      ISSUANCE OF STOCK. Unless otherwise voted by the stockholders
and subject to the provisions of the Certificate of Incorporation, the whole or
any part of any unissued balance of the authorized capital stock of the
Corporation or the whole or any part of any issued, authorized capital stock of
the Corporation held in its treasury may be issued, sold, transferred or
otherwise disposed of by vote of the Board of Directors in such manner, for such
consideration and on such terms as the Board of Directors may determine.

         4.2      CERTIFICATES OF STOCK. Every holder of stock of the
Corporation shall be entitled to have a certificate, in such form as may be
prescribed by law and by the Board of Directors, certifying the number and class
of shares owned by such stockholder in the Corporation. Each such certificate
shall be signed by, or in the name of the Corporation by, the Chairman or
Vice-Chairman, if any, of the Board of Directors, or the President or a Vice
President, and the Treasurer or an Assistant Treasurer, or the Secretary or an
Assistant Secretary of the Corporation. Any or all of the signatures on such
certificate may be a facsimile.

         Each certificate for shares of stock which are subject to any
restriction on transfer pursuant to the Certificate of Incorporation, the
By-Laws, applicable securities laws or any agreement among any number of
shareholders or among such holders and the Corporation shall have conspicuously
noted on the face or back of such certificate either the full text of such
restriction or a statement of the existence of such restriction.

         4.3      TRANSFERS. Except as otherwise established by rules and
regulations adopted by the Board of Directors, and subject to applicable law,
shares of stock may be transferred on the books of the Corporation by the
surrender to the Corporation or its transfer agent of the certificate
representing such shares, properly endorsed or accompanied by a written
assignment or power of attorney properly executed, and with such proof of
authority or the authenticity of signature as the Corporation or its transfer
agent may reasonably require. Except as may be otherwise required by law, by the
Certificate of Incorporation or by these By-Laws, the Corporation shall be
entitled to treat the record holder of stock as shown on its books as the owner
of such stock for all purposes, including the payment of dividends and the right
to vote with respect to such stock, regardless of any transfer, pledge or other
disposition of such stock, until the shares have been transferred on the books
of the Corporation in accordance with the requirements of these By-Laws.

         4.4      LOST, STOLEN OR DESTROYED CERTIFICATES. The Corporation may
issue a new certificate of stock in place of any previously issued certificate
alleged to have been lost, stolen, or destroyed, upon such terms and conditions
as the President may prescribe, including the presentation of reasonable
evidence of such loss, theft or destruction and the giving of such indemnity as
the President may require for the protection of the Corporation or any transfer
agent or registrar.


<PAGE>   17
                                      -14-


         4.5      RECORD DATE. The Board of Directors may fix in advance a date
as a record date for the determination of the stockholders entitled to notice of
or to vote at any meeting of stockholders or, to the extent permitted by the
Certificate of Incorporation and these By-laws, to express consent (or dissent)
to corporate action in writing without a meeting, or entitled to receive payment
of any dividend or other distribution or allotment of any rights in respect of
any change, conversion or exchange of stock, or for the purpose of any other
lawful action. Such record date shall not be more than 60 nor less than 10 days
before the date of such meeting, nor more than 60 days prior to any other action
to which such record date relates.

         If no record date is fixed, the record date for determining
stockholders entitled to notice of or to vote at a meeting of stockholders shall
be at the close of business on the day before the day on which notice is given,
or, if notice is waived, at the close of business on the day before the day on
which the meeting is held. The record date for determining stockholders entitled
to express consent to corporate action in writing without a meeting (to the
extent permitted by the Certificate of Incorporation and these By-laws) when no
prior action by the Board of Directors is necessary, shall be the day on which
the first written consent is expressed. The record date for determining
stockholders for any other purpose shall be at the close of business on the day
on which the Board of Directors adopts the resolution relating to such purpose.

         A determination of stockholders of record entitled to notice of or to
vote at a meeting of stockholders shall apply to any adjournment of the meeting;
provided, however, that the Board of Directors may fix a new record date for the
adjourned meeting.


                         ARTICLE 5 - GENERAL PROVISIONS

         5.1      FISCAL YEAR. The fiscal year of the Corporation shall be fixed
by resolution of the Board of Directors.


         5.2      CORPORATE SEAL. The corporate seal shall be in such form as 
shall be approved by the Board of Directors.

         5.3      NOTICES. Except as otherwise specifically provided herein or
required by law or the Certificate of Incorporation, all notices required to be
given to any stockholder, director, officer, employee or agent of the
Corporation shall be in writing and may in every instance be effectively given
by hand delivery to the recipient thereof, by depositing such notice in the
mails, postage paid, or by sending such notice by prepaid telegram or facsimile
transmission. Any such notice shall be addressed to such stockholder, director,
officer, employee or agent at his or her last known address as the same appears
on the books of the Corporation. The time when such notice is received shall be
deemed to be the time of the giving of the notice.

         5.4      WAIVER OF NOTICE. Whenever any notice whatsoever is required
to be given by law, by the Certificate of Incorporation or by these By-Laws, a
waiver of such notice either in writing signed by the person entitled to such
notice or such person's duly authorized attorney, or 
<PAGE>   18
                                      -15-


by telegraph, facsimile transmission or any other available method, whether
before, at or after the time stated in such waiver, or the appearance of such
person or persons at such meeting in person or by proxy, shall be deemed
equivalent to such notice.

         5.5      EVIDENCE OF AUTHORITY. A certificate by the Secretary, or an
Assistant Secretary, or a temporary Secretary, as to any action taken by the
stockholders, directors, a committee or any officer or representative of the
Corporation shall, as to all persons who rely on the certificate in good faith,
be conclusive evidence of such action.

         5.6      FACSIMILE SIGNATURES. In addition to the provisions for use of
facsimile signatures elsewhere specifically authorized in these By-Laws,
facsimile signatures of any officer or officers of the Corporation may be used
whenever and as authorized by the Board of Directors or a committee thereof.

         5.7      RELIANCE UPON BOOKS, REPORTS AND RECORDS. Each director, each
member of any committee designated by the Board of Directors, and each officer
of the Corporation shall, in the performance of his or her duties, be fully
protected in relying in good faith upon the books of account or other records of
the Corporation and upon such information, opinions, reports or statements
presented to the Corporation by any of its officers or employees or committees
of the Board of Directors so designated, or by any other person as to matters
which such director or committee member reasonably believes are within such
other person's professional or expert competence and who has been selected with
reasonable care by or on behalf of the Corporation.

         5.8      TIME PERIODS. In applying any provision of these By-Laws that
requires that an act be done or not be done a specified number of days prior to
an event or that an act be done during a period of a specified number of days
prior to an event, calendar days shall be used, the day of the doing of the act
shall be excluded, and the day of the event shall be included.

         5.9      CERTIFICATE OF INCORPORATION. All references in these By-Laws
to the Certificate of Incorporation shall be deemed to refer to the Certificate
of Incorporation of the Corporation, as amended and in effect from time to time.

         5.10     TRANSACTIONS WITH INTERESTED PARTIES. No contract or
transaction between the Corporation and one or more of the directors or
officers, or between the Corporation and any other corporation, partnership,
association, or other organization in which one or more of the directors or
officers are directors or officers, or have a financial interest, shall be void
or voidable solely for this reason, or solely because such director or officer
is present at or participates in the meeting of the Board of Directors or a
committee of the Board of Directors which authorizes the contract or transaction
or solely because his, her or their votes are counted for such purpose, if:

         (1)      The material facts as to his or her relationship or interest
      and as to the contract or transaction are disclosed or are known to the
      Board of Directors or the committee, and the Board or committee in good
      faith authorizes the contract or transaction by the affirmative vote


<PAGE>   19
                                      -16-


      of a majority of the disinterested directors, even though the
      disinterested directors be less than a quorum;

         (2)      The material facts as to his or her relationship or interest
      and as to the contract or transaction are disclosed or are known to the
      stockholders entitled to vote thereon, and the contract or transaction is
      specifically approved in good faith by vote of the stockholders; or

         (3)      The contract or transaction is fair as to the Corporation as
      of the time it is authorized, approved or ratified, by the Board of
      Directors, a committee of the Board of Directors, or the stockholders.

         Common or interested directors may be counted in determining the
presence of a quorum at a meeting of the Board of Directors or of a committee
which authorizes the contract or transaction.

         5.11     SEVERABILITY. Any determination that any provision of these
By-Laws is for any reason inapplicable, illegal or ineffective shall not affect
or invalidate any other provision of these By-Laws.

         5.12     PRONOUNS. All pronouns used in these By-Laws shall be deemed
to refer to the masculine, feminine or neuter, singular or plural, as the
identity of the persons or persons so designated may require.


                             ARTICLE 6 - AMENDMENTS

         6.1      BY THE BOARD OF DIRECTORS. Except as is otherwise set forth in
these By-Laws, these By-Laws may be altered, amended or repealed, or new by-laws
may be adopted, by the affirmative vote of a majority of the directors present
at any regular or special meeting of the Board of Directors at which a quorum is
present.

         6.2      BY THE STOCKHOLDERS. Except as otherwise set forth in these
By-Laws, these By-Laws may be altered, amended or repealed or new by-laws may be
adopted by the affirmative vote of the holders of a majority of the shares of
the capital stock of the Corporation issued and outstanding and entitled to vote
at any regular meeting of stockholders, or at any special meeting of
stockholders, provided notice of such alteration, amendment, repeal or adoption
of new by-laws shall have been stated in the notice of such special meeting.
Notwithstanding the foregoing, none of Paragraphs 1.3, 1.10 or 2.14 may be
altered, amended or repealed without the affirmative vote of the holders of
shares of voting stock of the Corporation representing at least seventy-five
percent (75%) of the voting power of all of the then outstanding shares of
capital stock of the Corporation entitled to vote thereon.

<PAGE>   1

                                                               EXHIBIT 3.05


                            CERTIFICATE OF AMENDMENT

                                       OF

                              AMENDED AND RESTATED

                          CERTIFICATE OF INCORPORATION

                                       OF

                      ONESOURCE INFORMATION SERVICES, INC.

     OneSource Information Services, Inc., a corporation organized and existing
under and by virtue of the General Corporation Law of the State of Delaware (the
"CORPORATION"), DOES HEREBY CERTIFY:

FIRST: That pursuant to the authority conferred upon the Board of Directors of
the Corporation by the Amended and Restated Certificate of Incorporation of the
Corporation (the "CHARTER"), the Board of Directors and Stockholders of the
Corporation duly adopted a resolution by written consent setting forth a
proposed amendment to the Charter.

SECOND: That said amendment would amend the Charter as follows:

1.   ARTICLE FOUR, Part A shall be deleted in its entirety and replaced with the
     following:

                                 "ARTICLE FOUR"
                                 --------------

                           Part A. AUTHORIZED SHARES

The total number of shares of capital stock which the Corporation has authority
to issue is 21,250,000 shares consisting of:

     (1) 1,250,000 shares of Class P Common Stock, par value $.01 per share
("CLASS P COMMON"); and

     (2) 20,000,000 shares of Common Stock, par value $.01 per share ("COMMON
STOCK").

     The Class P Common and Common Stock and any other common stock issued
hereafter are referred to collectively as the "COMMON SHARES". The Common Shares
shall have the rights,


<PAGE>   2


preferences and limitations set forth below. Capitalized terms used but not
otherwise defined in Part A or Part B of this Article Four are defined, in Part
C."

2.   ARTICLE FOUR Part B shall be amended by adding the following Section 8:

     "Section 8. MANDATORY RECLASSIFICATION. If at any time the Corporation
shall effect a firm commitment underwritten public offering of shares of Common
Stock in which the aggregate price paid for such shares by the public shall be
at least $15,000,000 (a "Qualified IPO"), then effective immediately prior to
the closing of the sale of such shares by the Corporation pursuant to such
public offering, each outstanding share of Class P Common shall automatically be
reclassified into one (1) share of Common Stock plus the number of additional
shares of Common Stock (the "Yield Shares") equal to the aggregate Unpaid Yield
to which such holder is entitled pursuant to this Part B divided by the price
per share to the public for each share of Common Stock in the Qualified IPO.
Holders of Class P Common so converted may deliver to the Corporation at its
principal office (or such other office or agency of the Corporation as the
Corporation may designate by notice in writing to such holders) during its usual
business hours, the certificate or certificates for the shares so converted, As
promptly as practicable thereafter, the Corporation shall issue and deliver to
such holder a certificate or certificates for the number of whole shares of
Common Stock to which such holder is entitled, together with any additional
shares of Common Stock and cash payment in lieu of fractional shares to which
such holder may be entitled pursuant to the terms set forth herein. Until such
time as a holder of Class P Common shall surrender his or its certificates
therefor as provided above, such certificates shall be deemed to represent the
shares of Common Stock to which such holder shall be entitled upon the surrender
thereof.

THIRD: That said amendment was duly adopted in accordance with the provisions of
Sections 228 and 242 of the General Corporation Law of the State of Delaware.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]


<PAGE>   3



     IN WITNESS WHEREOF, the Corporation has caused this certificate of
amendment to be signed by Daniel Schimmel, its President, as of this 2lst day of
April, 1999.

                                             ONESOURCE INFORMATION 
                                             SERVICES, INC.

                                             By: /s/ Daniel Schimmel
                                                ----------------------
                                                  Daniel Schimmel     
                                                  President




<PAGE>   1
                                                                    EXHIBIT 4.01



ONESOURCE INFORMATION SERVICES, INC.                  COMMON STOCK

INCORPORATED UNDER THE LAWS OF DELAWARE

SEE REVERSE FOR CERTAIN DEFINITIONS AND RESTRICTIONS
CUSIP 68272J 10 6

THIS CERTIFIES THAT


IS THE OWNER OF
FULLY PAID AND NON-ASSESSABLE SHARES OF COMMON STOCK, $.01 PAR VALUE, OF

                      ONESOURCE INFORMATION SERVICES, INC.

transferable on the books of the Corporation by the holder hereof in person or
by a duly authorized attorney upon surrender of this Certificate properly
endorsed. This Certificate is not valid until countersigned by the Transfer
Agent and registered by the Registrar.

         WITNESS the facsimile seal of the Corporation and the facsimile
signatures of its duly authorized officers.

Dated

                  Secretary                           Chief Executive Officer

COUNTERSIGNED AND REGISTERED:
AMERICAN STOCK TRANSFER & TRUST COMPANY
TRANSFER AGENT AND REGISTRAR

AUTHORIZED SIGNATURE

                      ONESOURCE INFORMATION SERVICES, INC.

         The following abbreviations, when used in the inscription on the face
of this certificate, shall be construed as though they were written out in full
according to applicable laws or regulations: 
TEN COM - as tenants in common UNIF GIFT MIN ACT - _________ Custodian ________ 
TEN ENT - as tenants by the entireties               (Cust)             (Minor)
JT TEN - as joint tenants with               under Uniform Gifts to Minors
         right of survivorship and
         not as tenants in common            Act _______________________________
                                                            (State)

     Additional abbreviations may also be used though not in the above list.


<PAGE>   2

         For value received, _________________________ hereby sell, assign and
transfer unto PLEASE INSERT SOCIAL SECURITY NUMBER OR OTHER IDENTIFYING NUMBER
OF ASSIGNEE

PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS OF ASSIGNEE

Shares of the capital stock represented by the within Certificate, and do hereby
irrevocably constitute and appoint___________________ Attorney to transfer the
said stock on the books of the within-named Corporation with full power of
substitution in the premises. 
Dated, ________________________      ___________________________________________
                                     Notice: The signature(s) to this assignment
                                     must correspond with the name(s) as written
                                     upon the face of the certificate, in every
                                     particular, without alteration or
                                     enlargement, or any change whatever.

Signature Guaranteed: __________________________________________________________
                      The signature(s) must be guaranteed by an eligible
                      guarantor institution, (banks, stockbrokers, savings and
                      loan associations and credit unions with membership in an
                      approved signature guarantee medallion program), pursuant
                      to S.E.C. Rule 17Ad-15.

<PAGE>   1

                                                                    EXHIBIT 5.01




                                    April 21, 1999

OneSource Information Services, Inc.
150 CambridgePark Drive
Cambridge, Massachusetts 02140

         RE:      Registration Statement on Form S-1
   
                  (Registration Statement No. 333-73263)
    
                  --------------------------------------

Ladies and Gentlemen:

         This opinion relates to an aggregate of 4,181,400 shares of Common 
Stock, par value $.01 per share (the "Common Stock"), of OneSource Information
Services, Inc. (the "Company"), which are the subject matter of a Registration
Statement on Form S-1 with the Securities and Exchange Commission (the
"Commission") as filed on March 3, 1999, as amended by Amendment No. 1 to
Registration Statement on Form S-1 as filed with the Commission on April 22,
1999 (the "Registration Statement").

   
         The 4,181,400 shares of Common Stock covered by the Registration
Statement consist of 2,500,000 shares being sold by the Company, 1,136,000
shares being sold by certain stockholders of the Company and 545,400 shares
subject to an over-allotment option granted by certain stockholders to the
underwriters to be named in the prospectus (the "Prospectus") incorporated by
reference in the Registration Statement.
    

         Based upon such investigation as we have deemed necessary, we are of
the opinion that when the 2,500,000 shares of Common Stock to be sold by the
Company pursuant to the Prospectus have been issued and paid for in accordance
with the terms described in the Prospectus, such shares of Common Stock will
have been validly issued and will be fully paid and nonassessable. Further, we
are of the opinion that the 1,136,000 shares of Common Stock to be sold by the
stockholders of the Company pursuant to the Prospectus have been validly issued
and are fully paid and nonassessable.

         We hereby consent to the filing of this opinion as Exhibit 5.1 to the
Registration Statement and to the reference to our firm in the Prospectus under
the caption "Legal Matters."

                                    Very truly yours,



                                    TESTA, HURWITZ & THIBEAULT, LLP

<PAGE>   1
                                                                   EXHIBIT 10.02



                      ONESOURCE INFORMATION SERVICES, INC.

                      1999 STOCK OPTION AND INCENTIVE PLAN

1.       PURPOSE AND ELIGIBILITY

         The purpose of this 1999 Stock Option and Incentive Plan (the "PLAN")
of OneSource Information Services, Inc. (the "COMPANY") is to provide stock
options and other equity interests in the Company (each an "AWARD") to
employees, officers, directors, consultants and advisors of the Company and its
Subsidiaries, all of whom are eligible to receive Awards under the Plan. Any
person to whom an Award has been granted under the Plan is called a
"PARTICIPANT". Additional definitions are contained in Section 8.

2.       ADMINISTRATION

         a.       ADMINISTRATION BY BOARD OF DIRECTORS. The Plan will be
administered by the Board of Directors of the Company (the "BOARD"). The Board,
in its sole discretion, shall have the authority to grant and amend Awards, to
adopt, amend and repeal rules relating to the Plan and to interpret and correct
the provisions of the Plan and any Award. All decisions by the Board shall be
final and binding on all interested persons. Neither the Company nor any member
of the Board shall be liable for any action or determination relating to the
Plan.

         b.       APPOINTMENT OF COMMITTEES. To the extent permitted by
applicable law, the Board may delegate any or all of its powers under the Plan
to one or more committees or subcommittees of the Board (a "COMMITTEE"). All
references in the Plan to the "BOARD" shall mean such Committee or the Board.

         c.       DELEGATION TO EXECUTIVE OFFICERS. To the extent permitted by
applicable law, the Board may delegate to one or more executive officers of the
Company the power to grant Awards and exercise such other powers under the Plan
as the Board may determine, provided that the Board shall fix the maximum number
of Awards to be granted and the maximum number of shares issuable to any one
Participant pursuant to Awards granted by such executive officers.

3.       STOCK AVAILABLE FOR AWARDS

         a.       NUMBER OF SHARES. Subject to adjustment under Section 3(c),
the aggregate number of shares of Common Stock of the Company (the "COMMON
STOCK") that may be issued pursuant to the Plan is 800,000 shares. If any Award
expires, or is terminated, surrendered or forfeited, in whole or in part, the
unissued Common Stock covered by such Award shall again be available for the
grant of Awards under the Plan. If shares of Common Stock issued pursuant to the
Plan are repurchased by, or are surrendered or forfeited to, the Company at no
more than 


<PAGE>   2



cost, such shares of Common Stock shall again be available for the grant of
Awards under the Plan; provided, however, that the cumulative number of such
shares that may be so reissued under the Plan will not exceed 600,000 shares.
Shares issued under the Plan may consist in whole or in part of authorized but
unissued shares or treasury shares.

         b.       PER-PARTICIPANT LIMIT. Subject to adjustment under Section
3(c), no Participant may be granted Awards during any one fiscal year to
purchase more than 100,000 shares of Common Stock.

         c.       ADJUSTMENT TO COMMON STOCK. In the event of any stock split,
stock dividend, extraordinary cash dividend, recapitalization, reorganization,
merger, consolidation, combination, exchange of shares, liquidation, spin-off,
split-up, or other similar change in capitalization or event, (i) the number and
class of securities available for Awards under the Plan and the per-Participant
share limit, (ii) the number and class of securities, vesting schedule and
exercise price per share subject to each outstanding Option, (iii) the
repurchase price per security subject to repurchase, and (iv) the terms of each
other outstanding stock-based Award shall be adjusted by the Company (or
substituted Awards may be made) to the extent the Board shall determine, in good
faith, that such an adjustment (or substitution) is appropriate. If Section
7(e)(i) applies for any event, this Section 3(c) shall not be applicable.

4.       STOCK OPTIONS

         a.       GENERAL. The Board may grant options to purchase Common Stock
(each, an "OPTION") and determine the number of shares of Common Stock to be
covered by each Option, the exercise price of each Option and the conditions and
limitations applicable to the exercise of each Option and the Common Stock
issued upon the exercise of each Option, including vesting provisions,
repurchase provisions and restrictions relating to applicable federal or state
securities laws, as it considers advisable.

         b.       INCENTIVE STOCK OPTIONS. An Option that the Board intends to
be an "incentive stock option" as defined in Section 422 of the Code (an
"INCENTIVE STOCK OPTION") shall be granted only to employees of the Company and
shall be subject to and shall be construed consistently with the requirements of
Section 422 of the Code. The Board and the Company shall have no liability if an
Option or any part thereof that is intended to be an Incentive Stock Option does
not qualify as such. An Option or any part thereof that does not qualify as an
Incentive Stock Option is referred to herein as a "NONSTATUTORY STOCK OPTION".

         c.       EXERCISE PRICE. The Board shall establish the exercise price
(or determine the method by which the exercise price shall be determined) at the
time each Option is granted and specify it in the applicable option agreement.

         d.       DURATION OF OPTIONS. Each Option shall be exercisable at such
times and subject to such terms and conditions as the Board may specify in the
applicable option agreement.


                                      -2-


<PAGE>   3

         e.       EXERCISE OF OPTION. Options may be exercised only by delivery
to the Company of a written notice of exercise signed by the proper person
together with payment in full as specified in Section 4(f) for the number of
shares for which the Option is exercised.

         f.       PAYMENT UPON EXERCISE. Common Stock purchased upon the
exercise of an Option shall be paid for by one or any combination of the
following forms of payment:

                  (i)      by check payable to the order of the Company;

                  (ii)     except as otherwise explicitly provided in the
applicable option agreement, and only if the Common Stock is then publicly
traded, delivery of an irrevocable and unconditional undertaking by a
creditworthy broker to deliver promptly to the Company sufficient funds to pay
the exercise price, or delivery by the Participant to the Company of a copy of
irrevocable and unconditional instructions to a creditworthy broker to deliver
promptly to the Company cash or a check sufficient to pay the exercise price; or

                  (iii)    to the extent explicitly provided in the applicable
option agreement, by (x) delivery of shares of Common Stock owned by the
Participant valued at fair market value (as determined by the Board or as
determined pursuant to the applicable option agreement), (y) delivery of a
promissory note of the Participant to the Company (and delivery to the Company
by the Participant of a check in an amount equal to the par value of the shares
purchased), or (z) payment of such other lawful consideration as the Board may
determine.

5.       RESTRICTED STOCK

         a.       GRANTS. The Board may grant Awards entitling Participants to
acquire shares of Common Stock, subject to (i) delivery to the Company by the
Participant of a check in an amount at least equal to the par value of the
shares purchased, and (ii) the right of the Company to repurchase all or part of
such shares at their issue price or other stated or formula price from the
Participant in the event that conditions specified by the Board in the
applicable Award are not satisfied prior to the end of the applicable
restriction period or periods established by the Board for such Award (each, a
"RESTRICTED STOCK AWARD").

         b.       TERMS AND CONDITIONS. The Board shall determine the terms and
conditions of any such Restricted Stock Award. Any stock certificates issued in
respect of a Restricted Stock Award shall be registered in the name of the
Participant and, unless otherwise determined by the Board, deposited by the
Participant, together with a stock power endorsed in blank, with the Company (or
its designee). After the expiration of the applicable restriction periods, the
Company (or such designee) shall deliver the certificates no longer subject to
such restrictions to the Participant or, if the Participant has died, to the
beneficiary designated by a Participant, in a manner determined by the Board, to
receive amounts due or exercise rights of the Participant in the event of the
Participant's death (the "DESIGNATED BENEFICIARY"). In the absence of an
effective designation by a Participant, Designated Beneficiary shall mean the
Participant's estate.

6.       OTHER STOCK-BASED AWARDS


                                      -3-



<PAGE>   4

         The Board shall have the right to grant other Awards based upon the
Common Stock having such terms and conditions as the Board may determine,
including, without limitation, the grant of shares based upon certain
conditions, the grant of securities convertible into Common Stock and the grant
of stock appreciation rights, phantom stock awards or stock units.

7.       GENERAL PROVISIONS APPLICABLE TO AWARDS

         a.       TRANSFERABILITY OF AWARDS. Except as the Board may otherwise
determine or provide in an Award, Awards shall not be sold, assigned,
transferred, pledged or otherwise encumbered by the person to whom they are
granted, either voluntarily or by operation of law, except by will or the laws
of descent and distribution, and, during the life of the Participant, shall be
exercisable only by the Participant. References to a Participant, to the extent
relevant in the context, shall include references to authorized transferees.

         b.       DOCUMENTATION. Each Award under the Plan shall be evidenced by
a written instrument in such form as the Board shall determine or as executed by
an officer of the Company pursuant to authority delegated by the Board. Each
Award may contain terms and conditions in addition to those set forth in the
Plan provided that such terms and conditions do not contravene the provisions of
the Plan.

         c.       BOARD DISCRETION. The terms of each type of Award need not be
identical, and the Board need not treat Participants uniformly.

         d.       TERMINATION OF STATUS. The Board shall determine the effect on
an Award of the disability, death, retirement, authorized leave of absence or
other change in the employment or other status of a Participant and the extent
to which, and the period during which, the Participant, or the Participant's
legal representative, conservator, guardian or Designated Beneficiary, may
exercise rights under the Award.

         e.       ACQUISITION OF THE COMPANY

                  (i)      CONSEQUENCES OF AN ACQUISITION.

                           (A)      ACQUISITION INTENDED TO BE ACCOUNTED FOR AS 
A POOLING-OF-INTERESTS. With respect to an Acquisition intended to be accounted
for as a pooling-of-interests: (x) all outstanding Awards shall remain the
obligation of the Company or be assumed by the surviving or acquiring entity,
and there shall be automatically substituted for the shares of Common Stock then
subject to such Awards the consideration payable with respect to the outstanding
shares of Common Stock in connection with the Acquisition and (y) if a recipient
of an Award is terminated by the surviving or acquiring Company without Cause
(as defined in the applicable option agreement) before the first anniversary of
the consummation of the Acquisition, then upon the consummation of the
Acquisition, (1) all Options then outstanding shall become immediately
exercisable in full and will terminate, to the extent unexercised, on their
scheduled expiration date, and if the shares of Common Stock subject to such
Options are 


                                      -4-


<PAGE>   5

subject to repurchase provisions, then such repurchase provisions shall
immediately lapse; (2) all Restricted Stock Awards then outstanding shall become
free of all repurchase provisions; and (3) all other stock-based Awards shall
become exercisable, realizable or vested in full, or shall be free of all
repurchase provisions, as the case may be

                           (B)      ACQUISITION INTENDED TO BE ACCOUNTED FOR 
UNDER THE PURCHASE METHOD. Unless otherwise expressly provided in the applicable
Option or Award, upon the occurrence of an Acquisition intended to be accounted
for under the purchase method, the Board or the board of directors of the
surviving or acquiring entity (as used in this Section 7(e)(i)(B), also the
"BOARD"), shall, as to outstanding Awards (on the same basis or on different
bases, as the Board shall specify), make appropriate provision for the
continuation of such Awards by the Company or the assumption of such Awards by
the surviving or acquiring entity and by substituting on an equitable basis for
the shares then subject to such Awards either (a) the consideration payable with
respect to the outstanding shares of Common Stock in connection with the
Acquisition, (b) shares of stock of the surviving or acquiring corporation or
(c) such other securities as the Board deems appropriate, the fair market value
of which (as determined by the Board in its sole discretion) shall not
materially differ from the fair market value of the shares of Common Stock
subject to such Awards immediately preceding the Acquisition. In addition to or
in lieu of the foregoing, with respect to outstanding Options, the Board may,
upon written notice to the affected optionees, provide that one or more Options
must be exercised, to the extent then exercisable or to be exercisable as a
result of the Acquisition, within a specified number of days of the date of such
notice, at the end of which period such Options shall terminate; or terminate
one or more Options in exchange for a cash payment equal to the excess of the
fair market value (as determined by the Board in its sole discretion) of the
shares subject to such Options (to the extent then exercisable or to be
exercisable as a result of the Acquisition) over the exercise price thereof.

                           (C)      ACQUISITION DEFINED. An "ACQUISITION" shall
mean: (x) any merger or consolidation after which the voting securities of the
Company outstanding immediately prior thereto represent (either by remaining
outstanding or by being converted into voting securities of the surviving or
acquiring entity) less than 50% of the combined voting power of the voting
securities of the Company or such surviving or acquiring entity outstanding
immediately after such event; or (y) any sale of all or substantially all of the
assets or capital stock of the Company (other than in a spin-off or similar
transaction) or (z) any other acquisition of the business of the Company, as
determined by the Board.

                  (ii)     ASSUMPTION OF OPTIONS UPON CERTAIN EVENTS. In
connection with a merger or consolidation of an entity with the Company or the
acquisition by the Company of property or stock of an entity, the Board may
grant Awards under the Plan in substitution for stock and stock-based awards
issued by such entity or an affiliate thereof. The substitute Awards shall be
granted on such terms and conditions as the Board considers appropriate in the
circumstances.

                  (iii)    POOLING-OF INTERESTS-ACCOUNTING. If the Company
proposes to engage in an Acquisition intended to be accounted for as a
pooling-of-interests, and in the event that the provisions of this Plan or of
any Award hereunder, or any actions of the Board taken in 


                                      -5-



<PAGE>   6

connection with such Acquisition, are determined by the Company's or the
acquiring company's independent public accountants to cause such Acquisition to
fail to be accounted for as a pooling-of-interests, then such provisions or
actions shall be amended or rescinded by the Board, without the consent of any
Participant, to be consistent with pooling-of-interests accounting treatment for
such Acquisition.

                  (iv)     PARACHUTE AWARDS. Notwithstanding the provisions of
Section 7(e)(i)(A), if, in connection with an Acquisition described therein, a
tax under Section 4999 of the Code would be imposed on the Participant (after
taking into account the exceptions set forth in Sections 280G(b)(4) and
280G(b)(5) of the Code), then the number of Awards which shall become
exercisable, realizable or vested as provided in such section shall be reduced
(or delayed), to the minimum extent necessary, so that no such tax would be
imposed on the Participant (the Awards not becoming so accelerated, realizable
or vested, the "PARACHUTE AWARDS"); provided, however, that if the "AGGREGATE
PRESENT VALUE" of the Parachute Awards would exceed the tax that, but for this
sentence, would be imposed on the Participant under Section 4999 of the Code in
connection with the Acquisition, then the Awards shall become immediately
exercisable, realizable and vested without regard to the provisions of this
sentence. For purposes of the preceding sentence, the "AGGREGATE PRESENT VALUE"
of an Award shall be calculated on an after-tax basis (other than taxes imposed
by Section 4999 of the Code) and shall be based on economic principles rather
than the principles set forth under Section 280G of the Code and the regulations
promulgated thereunder. All determinations required to be made under this
Section 7(e)(iv) shall be made by the Company.

         f.       WITHHOLDING. Each Participant shall pay to the Company, or
make provisions satisfactory to the Company for payment of, any taxes required
by law to be withheld in connection with Awards to such Participant no later
than the date of the event creating the tax liability. The Board may allow
Participants to satisfy such tax obligations in whole or in part by transferring
shares of Common Stock, including shares retained from the Award creating the
tax obligation, valued at their fair market value (as determined by the Board or
as determined pursuant to the applicable option agreement). The Company may, to
the extent permitted by law, deduct any such tax obligations from any payment of
any kind otherwise due to a Participant.

         g.       AMENDMENT OF AWARDS. The Board may amend, modify or terminate
any outstanding Award including, but not limited to, substituting therefor
another Award of the same or a different type, changing the date of exercise or
realization, and converting an Incentive Stock Option to a Nonstatutory Stock
Option, provided that, except as otherwise provided in Section 7(e)(iii), the
Participant's consent to such action shall be required unless the Board
determines that the action, taking into account any related action, would not
materially and adversely affect the Participant.

         h.       CONDITIONS ON DELIVERY OF STOCK. The Company will not be
obligated to deliver any shares of Common Stock pursuant to the Plan or to
remove restrictions from shares previously delivered under the Plan until (i)
all conditions of the Award have been met or removed to the satisfaction of the
Company, (ii) in the opinion of the Company's counsel, all other legal matters
in connection with the issuance and delivery of such shares have been 


                                      -6-



<PAGE>   7

satisfied, including any applicable securities laws and any applicable stock
exchange or stock market rules and regulations, and (iii) the Participant has
executed and delivered to the Company such representations or agreements as the
Company may consider appropriate to satisfy the requirements of any applicable
laws, rules or regulations.

         i.       ACCELERATION. The Board may at any time provide that any
Options shall become immediately exercisable in full or in part, that any
Restricted Stock Awards shall be free of some or all restrictions, or that any
other stock-based Awards may become exercisable in full or in part or free of
some or all restrictions or conditions, or otherwise realizable in full or in
part, as the case may be, despite the fact that the foregoing actions may (i)
cause the application of Sections 280G and 4999 of the Code if a change in
control of the Company occurs, or (ii) disqualify all or part of the Option as
an Incentive Stock Option.

8.       MISCELLANEOUS

         a.       DEFINITIONS.

                  (i)      "COMPANY," for purposes of eligibility under the
Plan, shall include any present or future subsidiary corporations of OneSource
Information Services, Inc., as defined in Section 424(f) of the Code (a
"SUBSIDIARY"), and any present or future parent corporation of OneSource
Information Services, Inc., as defined in Section 424(e) of the Code. For
purposes of Awards other than Incentive Stock Options, the term "COMPANY" shall
include any other business venture in which the Company has a direct or indirect
significant interest, as determined by the Board in its sole discretion.

                  (ii)     "CODE" means the Internal Revenue Code of 1986, as
amended, and any regulations promulgated thereunder.

                  (iii)    "EMPLOYEE" for purposes of eligibility under the Plan
shall include a person to whom an offer of employment has been extended by the
Company.

         b.       NO RIGHT TO EMPLOYMENT OR OTHER STATUS. No person shall have
any claim or right to be granted an Award, and the grant of an Award shall not
be construed as giving a Participant the right to continued employment or any
other relationship with the Company. The Company expressly reserves the right at
any time to dismiss or otherwise terminate its relationship with a Participant
free from any liability or claim under the Plan.

         c.       NO RIGHTS AS STOCKHOLDER. Subject to the provisions of the
applicable Award, no Participant or Designated Beneficiary shall have any rights
as a stockholder with respect to any shares of Common Stock to be distributed
with respect to an Award until becoming the record holder thereof.

         d.       EFFECTIVE DATE AND TERM OF PLAN. The Plan shall become
effective after adoption by the Board on a date determined by the Board. No
Awards shall be granted under the Plan 



                                      -7-
<PAGE>   8


after the completion of ten years from the date on which the Plan was adopted by
the Board, but Awards previously granted may extend beyond that date.

         e.       AMENDMENT OF PLAN. The Board may amend, suspend or terminate
the Plan or any portion thereof at any time.

         f.       GOVERNING LAW. The provisions of the Plan and all Awards made
hereunder shall be governed by and interpreted in accordance with the laws of
the State of Delaware, without regard to any applicable conflicts of law.








                                      -8-





<PAGE>   9




                                    Adopted by the Board of Directors on

                                    February 17, 1999

                                    Approved by the stockholders on

                                    April 21, 1999
                                    ---------------------









                                      -9-


<PAGE>   1
                                                                   EXHIBIT 10.03



                      ONESOURCE INFORMATION SERVICES, INC.

                        1999 EMPLOYEE STOCK PURCHASE PLAN


ARTICLE 1 - PURPOSE.

      This 1999 Employee Stock Purchase Plan (the "PLAN") is intended to
encourage stock ownership by all eligible employees of OneSource Information
Services, Inc. (the "COMPANY"), a Delaware corporation, and its participating
subsidiaries (as defined in Article 17) so that they may share in the growth of
the Company by acquiring or increasing their proprietary interest in the
Company. The Plan is designed to encourage eligible employees to remain in the
employ of the Company and its participating subsidiaries. The Plan is intended
to constitute an "employee stock purchase plan" within the meaning of Section
423(b) of the Internal Revenue Code of 1986, as amended (the "CODE").

ARTICLE 2 - ADMINISTRATION OF THE PLAN.

      The Plan may be administered by a committee appointed by the Board of
Directors of the Company (the "COMMITTEE"). The Committee shall consist of not
less than two members of the Company's Board of Directors. The Board of
Directors may from time to time remove members from, or add members to, the
Committee. Vacancies on the Committee, howsoever caused, shall be filled by the
Board of Directors. The Committee may select one of its members as Chairman, and
shall hold meetings at such times and places as it may determine. Acts by a
majority of the Committee, or acts reduced to or approved in writing by a
majority of the members of the Committee, shall be the valid acts of the
Committee.

      The interpretation and construction by the Committee of any provisions of
the Plan or of any option granted under it shall be final, unless otherwise
determined by the Board of Directors. The Committee may from time to time adopt
such rules and regulations for carrying out the Plan as it may deem best,
provided that any such rules and regulations shall be applied on a uniform basis
to all employees under the Plan. No member of the Board of Directors or the
Committee shall be liable for any action or determination made in good faith
with respect to the Plan or any option granted under it.

      In the event the Board of Directors fails to appoint or refrains from
appointing a Committee, the Board of Directors shall have all power and
authority to administer the Plan. In such event, the word "COMMITTEE" wherever
used herein shall be deemed to mean the Board of Directors.

ARTICLE 3 - ELIGIBLE EMPLOYEES.

      All employees of the Company or any of its participating subsidiaries
whose customary employment is more than 20 hours per week and for more than five
months in any calendar year and who have completed at least three months service
shall be eligible to receive options under the Plan to purchase common stock of
the Company, and all eligible employees shall have the same rights and
privileges hereunder. Persons who are eligible employees on the first business
day of any Payment Period (as defined in Article 5) shall receive their options
as of such day. Persons who become eligible employees after any date on which
options are granted under the Plan shall be granted options on the first day of
the next succeeding Payment Period on which options are granted to eligible
employees under the 


<PAGE>   2
                                      -2-


Plan. In no event, however, may an employee be granted an option if such
employee, immediately after the option was granted, would be treated as owning
stock possessing five percent or more of the total combined voting power or
value of all classes of stock of the Company or of any parent corporation or
subsidiary corporation, as the terms "parent corporation" and "subsidiary
corporation" are defined in Section 424(e) and (f) of the Code. For purposes of
determining stock ownership under this paragraph, the rules of Section 424(d) of
the Code shall apply, and stock which the employee may purchase under
outstanding options shall be treated as stock owned by the employee.

ARTICLE 4 - STOCK SUBJECT TO THE PLAN.

      The stock subject to the options under the Plan shall be shares of the
Company's authorized but unissued common stock, par value $.01 par value per
share (the "COMMON STOCK"), or shares of Common Stock reacquired by the Company,
including shares purchased in the open market. The aggregate number of shares
which may be issued pursuant to the Plan is 100,000, subject to adjustment as
provided in Article 12. If any option granted under the Plan shall expire or
terminate for any reason without having been exercised in full or shall cease
for any reason to be exercisable in whole or in part, the unpurchased shares
subject thereto shall again be available under the Plan.

ARTICLE 5 - PAYMENT PERIOD AND STOCK OPTIONS.

      The first Payment Period during which payroll deductions will be
accumulated under the Plan shall commence on the later to occur of June 1, 1999
and the first day of the first calendar month following effectiveness of the
Form S-8 registration statement filed with the Securities and Exchange
Commission covering the shares to be issued pursuant to the Plan and shall end
on December 31, 1999. For the remainder of the duration of the Plan, Payment
Periods shall consist of the six-month periods commencing on January 1 and July
1 and ending on June 30 and December 31, respectively, of each calendar year.

      Twice each year, on the first business day of each Payment Period, the
Company will grant to each eligible employee who is then a participant in the
Plan an option to purchase on the last day of such Payment Period, at the Option
Price hereinafter provided for, a maximum of 1,000 shares, on condition that
such employee remains eligible to participate in the Plan throughout the
remainder of such Payment Period. The participant shall be entitled to exercise
the option so granted only to the extent of the participant's accumulated
payroll deductions on the last day of such Payment Period. If the participant's
accumulated payroll deductions on the last day of the Payment Period would
enable the participant to purchase more than 1,000 shares except for the
1,000-share limitation, the excess of the amount of the accumulated payroll
deductions over the aggregate purchase price of the 1,000 shares shall be
promptly refunded to the participant by the Company, without interest. The
Option Price per share for each Payment Period shall be the lesser of (i) 85% of
the average market price of the Common Stock on the first business day of the
Payment Period and (ii) 85% of the average market price of the Common Stock on
the last business day of the Payment Period, in either event rounded up TO the
nearest cent. The foregoing limitation on the number of shares subject to option
and the Option Price shall be subject to adjustment as provided in Article 12.

      For purposes of the Plan, the term "average market price" on any date
means (i) the average (on that date) of the high and low prices of the Common
Stock on the principal national securities exchange on which the Common Stock is
traded, if the Common Stock is then traded on a national securities exchange; or
(ii) the last reported sale price (on that date) of the Common Stock on the
NASDAQ 
<PAGE>   3

                                      -3-


National Market, if the Common Stock is not then traded on a national securities
exchange; or (iii) the average of the closing bid and asked prices last quoted
(on that date) by an established quotation service for over-the-counter
securities, if the Common Stock is not reported on the NASDAQ National Market;
or (iv) if the Common Stock is not publicly traded, the fair market value of the
Common Stock as determined by the Committee after taking into consideration all
factors which it deems appropriate, including, without limitation, recent sale
and offer prices of the Common Stock in private transactions negotiated at arm's
length.

      For purposes of the Plan, the term "business day" means a day on which
there is trading on the NASDAQ National Market or the aforementioned national
securities exchange, whichever is applicable pursuant to the preceding
paragraph; and if neither is applicable, a day that is not a Saturday, Sunday or
legal holiday in Massachusetts.

      No employee shall be granted an option which permits the employee's right
to purchase stock under the Plan, and under all other Section 423(b) employee
stock purchase plans of the Company and any parent or subsidiary corporations,
to accrue at a rate which exceeds $25,000 of fair market value of such stock
(determined on the date or dates that options on such stock were granted) for
each calendar year in which such option is outstanding at any time. The purpose
of the limitation in the preceding sentence is to comply with Section 423(b)(8)
of the Code. If the participant's accumulated payroll deductions on the last day
of the Payment Period would otherwise enable the participant to purchase Common
Stock in excess of the Section 423(b)(8) limitation described in this paragraph,
the excess of the amount of the accumulated payroll deductions over the
aggregate purchase price of the shares actually purchased shall be promptly
refunded to the participant by the Company, without interest.

ARTICLE 6 - EXERCISE OF OPTION.

      Each eligible employee who continues to be a participant in the Plan on
the last day of a Payment Period shall be deemed to have exercised his or her
option on such date and shall be deemed to have purchased from the Company such
number of full shares of Common Stock reserved for the purpose of the Plan as
the participant's accumulated payroll deductions on such date will pay for at
the Option Price, subject to the 1,000-share limit of the option and the Section
423(b)(8) limitation described in Article 5. If the individual is not a
participant on the last day of a Payment Period, the he or she shall not be
entitled to exercise his or her option. Only full shares of Common Stock may be
purchased under the Plan. Unused payroll deductions remaining in a participant's
account at the end of a Payment Period by reason of the inability to purchase a
fractional share shall be carried forward to the next Payment Period.

ARTICLE 7 - AUTHORIZATION FOR ENTERING THE PLAN.

      An employee may elect to enter the Plan by filling out, signing and
delivering to the Company an authorization:

              A.     Stating the percentage to be deducted regularly from the 
      employee's pay;

              B.     Authorizing the purchase of stock for the employee in each
      Payment Period in accordance with the terms of the Plan; and

              C.     Specifying the exact name or names in which stock purchased
      for the employee is to be issued as provided under Article 11 hereof.


<PAGE>   4
                                      -4-


Such authorization must be received by the Company at least ten days before the
first day of the next succeeding Payment Period and shall take effect only if
the employee is an eligible employee on the first business day of such Payment
Period.

      Unless a participant files a new authorization or withdraws from the Plan,
the deductions and purchases under the authorization the participant has on file
under the Plan will continue from one Payment Period to succeeding Payment
Periods as long as the Plan remains in effect.

      The Company will accumulate and hold for each participant's account the
amounts deducted from his or her pay. No interest will be paid on these amounts.

ARTICLE 8 - MAXIMUM AMOUNT OF PAYROLL DEDUCTIONS.

      An employee may authorize payroll deductions in an amount (expressed as a
whole percentage) not less than one percent (1%) but not more than ten percent
(10%) of the employee's total compensation, including base pay or salary and any
overtime, bonuses or commissions.

ARTICLE 9 - CHANGE IN PAYROLL DEDUCTIONS.

      Deductions may not be increased or decreased during a Payment Period.
However, a participant may withdraw in full from the Plan.

ARTICLE 10 - WITHDRAWAL FROM THE PLAN.

      A participant may withdraw from the Plan (in whole but not in part) at any
time prior to the last day of a Payment Period by delivering a withdrawal notice
to the Company.

      To re-enter the Plan, an employee who has previously withdrawn must file a
new authorization at least ten days before the first day of the next Payment
Period in which he or she wishes to participate. The employee's re-entry into
the Plan becomes effective at the beginning of such Payment Period, provided
that he or she is an eligible employee on the first business day of the Payment
Period.

ARTICLE 11 - ISSUANCE OF STOCK.

      Certificates for stock issued to participants shall be delivered as soon
as practicable after each Payment Period by the Company's transfer agent.

      Stock purchased under the Plan shall be issued only in the name of the
participant, or if the participant's authorization so specifies, in the name of
the participant and another person of legal age as joint tenants with rights of
survivorship.

ARTICLE 12 - ADJUSTMENTS.

      Upon the happening of any of the following described events, a
participant's rights under options granted under the Plan shall be adjusted as
hereinafter provided:

              A. In the event that the shares of Common Stock shall be
      subdivided or combined into a greater or smaller number of shares or if,
      upon a reorganization, split-up, liquidation, recapitalization or the like
      of the Company, the shares of Common Stock shall be exchanged for other
      securities of the Company, each participant shall be entitled, subject to
      the conditions herein 
<PAGE>   5
                                      -5-


      stated, to purchase such number of shares of Common Stock or amount of
      other securities of the Company as were exchangeable for the number of
      shares of Common Stock that such participant would have been entitled to
      purchase except for such action, and appropriate adjustments shall be made
      in the purchase price per share to reflect such subdivision, combination
      or exchange; and

              B. In the event the Company shall issue any of its shares as a
      stock dividend upon or with respect to the shares of stock of the class
      which shall at the time be subject to option hereunder, each participant
      upon exercising such an option shall be entitled to receive (for the
      purchase price paid upon such exercise) the shares as to which the
      participant is exercising his or her option and, in addition thereto (at
      no additional cost), such number of shares of the class or classes in
      which such stock dividend or dividends were declared or paid, and such
      amount of cash in lieu of fractional shares, as is equal to the number of
      shares thereof and the amount of cash in lieu of fractional shares,
      respectively, which the participant would have received if the participant
      had been the holder of the shares as to which the participant is
      exercising his or her option at all times between the date of the granting
      of such option and the date of its exercise.

      Upon the happening of any of the foregoing events, the class and aggregate
number of shares set forth in Article 4 hereof which are subject to options
which have been or may be granted under the Plan and the limitations set forth
in the second paragraph of Article 5 shall also be appropriately adjusted to
reflect the events specified in paragraphs A and B above. Notwithstanding the
foregoing, any adjustments made pursuant to paragraphs A or B shall be made only
after the Committee, based on advice of counsel for the Company, determines
whether such adjustments would constitute a "modification" (as that term is
defined in Section 424 of the Code). If the Committee determines that such
adjustments would constitute a modification, it may refrain from making such
adjustments.

      If the Company is to be consolidated with or acquired by another entity in
a merger, a sale of all or substantially all of the Company's assets or
otherwise (an "ACQUISITION"), the Committee or the board of directors of any
entity assuming the obligations of the Company hereunder (the "SUCCESSOR BOARD")
shall, with respect to options then outstanding under the Plan, either (i) make
appropriate provision for the continuation of such options by arranging for the
substitution on an equitable basis for the shares then subject to such options
either (a) the consideration payable with respect to the outstanding shares of
the Common Stock in connection with the Acquisition, (b) shares of stock of the
successor corporation, or a parent or subsidiary of such corporation, or (c)
such other securities as the Successor Board deems appropriate, the fair market
value of which shall not materially exceed the fair market value of the shares
of Common Stock subject to such options immediately preceding the Acquisition;
or (ii) terminate each participant's options in exchange for a cash payment
equal to the excess of (a) the fair market value on the date of the Acquisition,
of the number of shares of Common Stock that the participant's accumulated
payroll deductions as of the date of the Acquisition could purchase, at an
option price determined with reference only to the first business day of the
applicable Payment Period and subject to the [NUMBER]-share, Code Section
423(b)(8) and fractional-share limitations on the amount of stock a participant
would be entitled to purchase, over (b) the result of multiplying such number of
shares by such option price.

      The Committee or Successor Board shall determine the adjustments to be
made under this Article 12, and its determination shall be conclusive.

ARTICLE 13 - NO TRANSFER OR ASSIGNMENT OF EMPLOYEE'S RIGHTS.

      An option granted under the Plan may not be transferred or assigned and
may be exercised only by the participant.


<PAGE>   6
                                      -6-


ARTICLE 14 - TERMINATION OF EMPLOYEE'S RIGHTS.

      Whenever a participant ceases to be an eligible employee because of
retirement, voluntary or involuntary termination, resignation, layoff,
discharge, death or for any other reason, his or her rights under the Plan shall
immediately terminate, and the Company shall promptly refund, without interest,
the entire balance of his or her payroll deduction account under the Plan.
Notwithstanding the foregoing, eligible employment shall be treated as
continuing intact while a participant is on military leave, sick leave or other
bona fide leave of absence, for up to 90 days, or for so long as the
participant's right to re-employment is guaranteed either by statute or by
contract, if longer than 90 days.

ARTICLE 15 - TERMINATION AND AMENDMENTS TO PLAN.

      The Plan may be terminated at any time by the Company's Board of Directors
but such termination shall not affect options then outstanding under the Plan.
It will terminate in any case when all or substantially all of the unissued
shares of stock reserved for the purposes of the Plan have been purchased. If at
any time shares of stock reserved for the purpose of the Plan remain available
for purchase but not in sufficient number to satisfy all then unfilled purchase
requirements, the available shares shall be apportioned among participants in
proportion to the amount of payroll deductions accumulated on behalf of each
participant that would otherwise be used to purchase stock, and the Plan shall
terminate. Upon such termination or any other termination of the Plan, all
payroll deductions not used to purchase stock will be refunded, without
interest.

      The Committee or the Board of Directors may from time to time adopt
amendments to the Plan provided that, without the approval of the stockholders
of the Company, no amendment may (i) increase the number of shares that may be
issued under the Plan; (ii) change the class of employees eligible to receive
options under the Plan, if such action would be treated as the adoption of a new
plan for purposes of Section 423(b) of the Code; or (iii) cause Rule 16b-3 under
the Securities Exchange Act of 1934 to become inapplicable to the Plan.

ARTICLE 16 - LIMITS ON SALE OF STOCK PURCHASED UNDER THE PLAN.

      The Plan is intended to provide shares of Common Stock for investment and
not for resale. The Company does not, however, intend to restrict or influence
any employee in the conduct of his or her own affairs. An employee may,
therefore, sell stock purchased under the Plan at any time the employee chooses,
subject to compliance with any applicable federal or state securities laws and
subject to any restrictions imposed under Article 21 to ensure that tax
withholding obligations are satisfied. THE EMPLOYEE ASSUMES THE RISK OF ANY
MARKET FLUCTUATIONS IN THE PRICE OF THE STOCK.

ARTICLE 17 - PARTICIPATING SUBSIDIARIES.

      The term "participating subsidiary" shall mean any present or future
subsidiary of the Company, as that term is defined in Section 424(f) of the
Code, which is designated from time to time by the Board of Directors to
participate in the Plan. The Board of Directors shall have the power to make
such designation before or after the Plan is approved by the stockholders.

ARTICLE 18 - OPTIONEES NOT STOCKHOLDERS.


<PAGE>   7
                                      -7-


      Neither the granting of an option to an employee nor the deductions from
his or her pay shall constitute such employee a stockholder of the shares
covered by an option until such shares have been actually purchased by the
employee.

ARTICLE 19 - APPLICATION OF FUNDS.

      The proceeds received by the Company from the sale of Common Stock
pursuant to options granted under the Plan will be used for general corporate
purposes.

ARTICLE 20 - NOTICE TO COMPANY OF DISQUALIFYING DISPOSITION.

      By electing to participate in the Plan, each participant agrees to notify
the Company in writing immediately after the participant transfers Common Stock
acquired under the Plan, if such transfer occurs within two years after the
first business day of the Payment Period in which such Common Stock was
acquired. Each participant further agrees to provide any information about such
a transfer as may be requested by the Company or any subsidiary corporation in
order to assist it in complying with the tax laws. Such dispositions generally
are treated as "disqualifying dispositions" under Sections 421 and 424 of the
Code, which have certain tax consequences to participants and to the Company and
its participating subsidiaries.

ARTICLE 21 - WITHHOLDING OF ADDITIONAL INCOME TAXES.

      By electing to participate in the Plan, each participant acknowledges that
the Company and its participating subsidiaries are required to withhold taxes
with respect to the amounts deducted from the participant's compensation and
accumulated for the benefit of the participant under the Plan, and each
participant agrees that the Company and its participating subsidiaries may
deduct additional amounts from the participant's compensation, when amounts are
added to the participant's account, used to purchase Common Stock or refunded,
in order to satisfy such withholding obligations. Each participant further
acknowledges that when Common Stock is purchased under the Plan the Company and
its participating subsidiaries may be required to withhold taxes with respect to
all or a portion of the difference between the fair market value of the Common
Stock purchased and its purchase price, and each participant agrees that such
taxes may be withheld from compensation otherwise payable to such participant.
It is intended that tax withholding will be accomplished in such a manner that
the full amount of payroll deductions elected by the participant under Article 7
will be used to purchase Common Stock. However, if amounts sufficient to satisfy
applicable tax withholding obligations have not been withheld from compensation
otherwise payable to any participant, then, notwithstanding any other provision
of the Plan, the Company may withhold such taxes from the participant's
accumulated payroll deductions and apply the net amount to the purchase of
Common Stock, unless the participant pays to the Company, prior to the exercise
date, an amount sufficient to satisfy such withholding obligations. Each
participant further acknowledges that the Company and its participating
subsidiaries may be required to withhold taxes in connection with the
disposition of stock acquired under the Plan and agrees that the Company or any
participating subsidiary may take whatever action it considers appropriate to
satisfy such withholding requirements, including deducting from compensation
otherwise payable to such participant an amount sufficient to satisfy such
withholding requirements or conditioning any disposition of Common Stock by the
participant upon the payment to the Company or such subsidiary of an amount
sufficient to satisfy such withholding requirements.


<PAGE>   8
                                      -8-


ARTICLE 22 - GOVERNMENTAL REGULATIONS.

      The Company's obligation to sell and deliver shares of Common Stock under
the Plan is subject to the approval of any governmental authority required in
connection with the authorization, issuance or sale of such shares.

      Government regulations may impose reporting or other obligations on the
Company with respect to the Plan. For example, the Company may be required to
identify shares of Common Stock issued under the Plan on its stock ownership
records and send tax information statements to employees and former employees
who transfer title to such shares.

ARTICLE 23 - GOVERNING LAW.

      The validity and construction of the Plan shall be governed by the laws of
[STATE], without giving effect to the principles of conflicts of law thereof.

ARTICLE 24 - APPROVAL OF BOARD OF DIRECTORS AND STOCKHOLDERS OF THE COMPANY.

      The Plan was adopted by the Board of Directors on February 17, 1999 and
was approved by the stockholders of the Company on April 21, 1999.






<PAGE>   1
                                                                   EXHIBIT 10.14


                             STOCKHOLDERS AGREEMENT

         THIS STOCKHOLDERS AGREEMENT is made as of September 8, 1993, by and
between OneSource Holding Corporation, a Delaware Corporation (the "Company") ,
William Blair Venture Partners III Limited Partnership ("William Blair"),
Information Partners Capital Fund, L.P. ("Information Partners"), Silicon Valley
Bank ("Silicon"), and certain other persons listed on Schedule A (William Blair,
Information Partners, Silicon, and such other persons are collectively referred
to herein as the "Stockholders," and each as a "Stockholder"). Unless otherwise
indicated herein, capitalized terms used herein are defined in paragraph 9
hereof.

         WHEREAS, the Company, as of the date hereof, is authorized by its
Certificate of Incorporation to issue capital stock consisting of 100,000 shares
of its Class P Common Stock, par value $. 01 per share (the "Class P Common"),
and 1, 500, 000 shares of its Common Stock, par value $.01 per share ("Common").
The Class P Common and the Common are collectively referred to herein as "Common
Stock".

         WHEREAS, at the Closing, pursuant to a Stock Purchase Agreement between
the Company and certain of the Stockholders, dated as of the date hereof (the
"Purchase Agreement"), certain of the Stockholders will purchase from the
Company the number of shares of Common Stock set forth opposite such
Stockholder's name on the Schedule of Purchasers attached to the Purchase
Agreement.

         WHEREAS, the parties hereto desire to restrict the sale, assignment,
transfer, encumbrance or other disposition of the Common Stock and to provide
for certain rights and obligations in respect thereto as hereinafter provided.

         NOW, THEREFORE, the parties to this Agreement hereby agree as follows:

         1.       VOTING AGREEMENT.

         (a)      From and after the Closing (as defined in the Purchase
Agreement) and until the provisions of this paragraph 1 cease to be effective,
each holder of Investor Shares shall vote all of his Investor Shares and shall
take all other necessary or desirable actions within his control (whether in his
capacity as a stockholder or officer of the Company or otherwise, and including,
without limitation, attendance at meetings in person or by proxy for purposes of
obtaining a quorum and execution of written consents in lieu of meetings), and
the Company shall take all necessary and desirable actions within its control
(including, without limitation, calling special board and stockholder meetings),
so that:

         (i)      subject to paragraph l(e) below, the authorized number of
directors on the Company's board of directors (the "Board") shall be established
at two directors;

         (ii)     the following persons shall be elected to the Board:


<PAGE>   2
                                      -2-


                  (A)      one representative designated by the holders of the 
         William Blair Shares (the "Blair Director"); and

                  (B)      one representative designated by the holders of the
         Information Partners Shares (the "IP Director");

         provided that, in the event that William Blair or Information Partners
         cease to own at least 25% of the William Blair Shares or the
         Information Partners shares, respectively, which it originally
         purchased pursuant to the Purchase Agreement, the right to designate
         their one representative will be transferred to the other group;

         (iii)    the removal from the Board (with or without cause) of any
representative designated hereunder by the holders of a majority of the William
Blair Shares or the Information Partners Shares shall be at William Blair's or
Information Partners' written request, respectively, but only upon such written
request and under no other circumstances (in each case, determined on the basis
of a vote of the holders of a majority of the shares of Common Stock held by
such persons);

         (iv)     in the event that any representative designated hereunder by
the holders of a majority of the William Blair Shares or the Information
Partners Shares for any reason ceases to serve as a member of the Board during
his term of office, the resulting vacancy on the Board shall be filled by a
representative designated by the William Blair or Information Partners,
respectively, as provided hereunder;

         (b)      From and after the Closing (as defined in the Purchase
Agreement) and until the provisions of this paragraph 1 cease to be effective,
the Company shall vote all shares of common stock of OneSource Information
Services, Inc. ("OneSource") and shall take all other necessary or desirable
actions within its control, so that:

         (i)      subject to paragraph 1 (e) below, the authorized number of
directors on the board of directors of OneSource (the "OneSource Board") shall
be established at five directors;

         (ii)     the following persons shall be elected to the OneSource Board:

                  (A)      one representative designated by the holders of the 
         William Blair Shares; and

                  (B)      one representative designated by the holders of the 
         Information Partners Shares;

                  (C)      the President of OneSource;


<PAGE>   3
                                      -3-


                  (D)      the Chairman of OneSource; and

                  (E)      one representative to be mutually agreed upon by the
                           holders of the William Blair Shares and the holders 
                           of the Information Partners Shares;

      provided that, in the event that William Blair or Information Partners
      cease to own at least 25% of the William Blair Shares or the Information
      Partners Shares, respectively, which it originally purchased pursuant to
      the Purchase Agreement, the right to designate their one representative
      will be transferred to the other group and the right to designate pursuant
      to subparagraph (E) above will be made solely by the group which has the
      right to designate directors pursuant to subparagraphs (A) and (B) above;

         (c)      The Company shall pay the reasonable out-of-pocket expenses
incurred by each director in connection with attending the meetings of the Board
and any committee thereof.

         (d)      The provisions of this paragraph 1 shall terminate
automatically and be of no further force and effect upon the first to occur of
(i) the tenth anniversary of the date hereof unless extended by the parties
hereto in accordance with (or any similar provision then in force) Section 218
of the Delaware General Corporation Law, or (ii) a Qualified Public Offering.

         (e)      If any party fails to designate a representative to fill a
directorship or committee membership pursuant to the terms of this paragraph 1
within 30 days after such vacancy occurs, the election of a person to such
directorship shall be accomplished in accordance with the Company's or
OneSource's bylaws, as the case may be, and applicable law; provided that in the
event that such party then designates a representative to fill such membership
such designee will replace the person elected.

         2.       RESTRICTIONS ON TRANSFER OF STOCKHOLDER SHARES.

         (a)      TRANSFER OF STOCKHOLDER SHARES. No holder of Stockholder
Shares shall sell, transfer, assign, pledge or otherwise dispose of (a
"Transfer") any interest in any Stockholder Shares except pursuant to the
provisions of this paragraph 2 or pursuant to an Exempt Transfer (as defined in
paragraph 2(e)).

         (b)      NOTICE OF PROPOSED TRANSFER. Prior to making any Transfer of
any Stockholder Shares (other than an Exempt Transfer) , the transferring holder
of Stockholder Shares (the "Transferring Stockholder") shall deliver a written
notice (the "Sale Notice") to the Company and the holders of Investor Shares.
The Sale Notice shall disclose in reasonable detail the proposed number and
class of Stockholder Shares to be transferred (the "Offered Shares") and the
proposed terms and conditions of the Transfer, which shall be in the form of a
sale of such Offered Shares solely for cash (payable at closing or in specified
installments).


<PAGE>   4
                                      -4-


         (c)      FIRST OFFER RIGHT. The Company may elect to purchase all or
any portion of the Offered Shares at the price and on the terms specified in the
Sale Notice by delivering written notice of such election to the Transferring
Stockholder and the holders of Investor Shares as soon as practicable but in any
event within 15 days after the delivery of the Sale Notice. If the Company has
not elected to purchase all of the Offered Shares within such 15-day period,
each holder of Investor Shares (other than the Transferring Stockholder) may
elect to purchase up to his Pro Rata Share (as defined below) of the Offered
Shares at the price and on the terms specified in the Sale Notice by delivering
written notice of such election to the Transferring Stockholder and all other
holders as soon as practicable but in any event within 45 days after delivery of
the Sale Notice. Any Offered Shares not elected to be purchased by the end of
such 30-day period shall be reoffered for an additional 10-day period by the
Transferring Stockholder on pro rata basis to the holders of Investor Shares who
have elected to purchase their Pro Rata Share. If the Company or any holder of
Investor Shares has elected to purchase Offered Shares from the Transferring
Stockholder, the transfer of such shares shall be consummated as soon as
practicable after the delivery of the election notices, but in any event within
90 days after delivery of the Sale Notice. To the extent that the Company and
the holders of Investor Shares have not elected to purchase all of the Offered
Shares, the Transferring Stockholder may, within 12 0 days after the end of the
40-day notice period, transfer the balance of such Offered Shares to one or more
third parties at a price no less than 95% of the price per share specified in
the Sale Notice and on other terms no more favorable to the transferees than
offered to the Company and the holders of Investor Shares in the Sale Notice.
Each holder's "Pro Rata Share" shall be based upon such holder's percentage
ownership of the Investor Shares on a fully-diluted basis. The Transferring
Stockholder's ability to effect any Transfer pursuant to this Section 2(c),
whether to the Company, the other holders of Investor Shares or any third party,
shall in all cases be subject to the participation rights of other holders of
Investor Shares pursuant to Section 2(d) below.

         (d)      PARTICIPATION RIGHTS. Each holder of Investor Shares (other
than the Transferring Stockholder) may elect to participate in the contemplated
Transfer by delivering written notice to the Transferring Stockholder within 30
days after delivery of the Sale Notice.

                  If any holders of Investor Shares have elected to participate
in such Transfer, the Transferring Stockholder and such other holders shall be
entitled to include in the contemplated Transfer, at the same price and on the
same terms, a number of such class or classes of Stockholder Shares (the
"Included Shares") equal to the product of (i) the quotient determined by
dividing the percentage of such class of the Stockholder Shares owned by such
person by the aggregate percentage of such class of the Stockholder Shares owned
by the Transferring Stockholder and all holders electing to participate in such
Transfer and (ii) the number of such class of Offered Shares. For purposes of
this paragraph, each series of a given class will be treated the same for the
determination of the number of Stockholder Shares used in the calculation above.

              FOR EXAMPLE, if the contemplated Transfer involves 100 Offered
              Shares of a certain class and if the Transferring Stockholder


<PAGE>   5
                                      -5-


              at such time owns 30% of all Stockholder Shares of such class and
              if one other holder elects to participate and owns 20% of all
              Stockholder Shares of such class, the Transferring Stockholder
              would be entitled to sell 60 shares ((30% [dividend sign] 50%) x 
              100 shares) and the other holder would be entitled to sell 40 
              shares ((20% [dividend sign] 50%) x 100 shares).

Each holder of Stockholder Shares shall use best efforts to obtain the agreement
of the prospective transferee (s) to the participation of the other holders in
any contemplated Transfer, and each holder shall not transfer any of its
Stockholder Shares to the prospective transferee (s) if the prospective
transferee (s) declines to allow the participation of the other holders.

         (e)      PERMITTED TRANSFERS. The restrictions contained in this
Section 2 shall not apply to (i) any Transfer of Stockholder Shares by any
Stockholder among its Affiliates, (ii) a Public Sale, (iii) a Sale of the
Company, (iv) a Transfer of Stockholder Shares by any Stockholder pursuant to
the laws of descent and distribution or among such Stockholder's Family Group,
or (v) a Transfer pursuant to paragraph 2(c) or paragraph 2(d) above. Any
Transfer permitted by this Section 2(e) is referred to herein as an "Exempt
Transfer."

         (f)      TERMINATION OF RESTRICTIONS. The restrictions set forth in
this paragraph 2 shall continue with respect to each Stockholder Share until the
earlier of (i) the date on which such Stockholder Share has been transferred in
a Public Sale, (ii) the consummation of a Sale of the Company or (iii) the
consummation of a Qualified Public Offering.

         3.       SALE OF THE COMPANY.

         (a)      Notwithstanding any provision to the contrary contained 
herein, the holders of a majority of the William Blair Shares and the holders of
a majority of the Information Partners Shares (collectively, the "Sale
Stockholders") may require that the Company enter into a Sale of the Company;
provided, however, that in the event that William Blair and/or Information
Partners cease to hold at least 25% of the William Blair Shares or Information
Partners Shares, respectively, which were originally purchased by William Blair
or Information Partners pursuant to the Purchase Agreement, the William Blair
Shares in the case of William Blair, and the Information Partners Shares in the
case of Information Partners, will not have the right to require or the right to
prevent the other group from requiring that the Company enter into a Sale of the
Company pursuant to this paragraph 3 (collectively an "Approved Sale").

         (b)      If the Company enters into a Sale of the Company pursuant to
Section 3(a), each holder of Stockholder Shares shall vote for, consent to and
raise no objection against such Approved Sale. If the Approved Sale is
structured as a (i) merger or consolidation, each holder of Stockholder Shares
shall waive any dissenters rights, appraisal rights or similar rights in
connection with such merger or consolidation, or (ii) sale of stock, each holder
of Stockholder Shares shall agree to sell all of his Stockholder Shares and
rights to acquire Stockholder Shares on the terms and conditions approved by the
Board and pursuant to the Approved Sale. Each 

<PAGE>   6
                                      -6-


holder of Stockholder Shares shall take all necessary or desirable actions in
connection with the consummation of the Approved Sale as requested by the
Company.

         (c)      The obligations of the holders of the Stockholder Shares with
respect to the Approved Sale of the Company are also subject to the satisfaction
of the following conditions: (i) the consideration received in an Approved Sale
shall be distributed among the holders of Stockholder Shares in the manner which
such proceeds would be distributed in a complete liquidation of the Company
pursuant to the rights and preferences set forth in the Certificate of
Incorporation as in effect immediately prior to such Approved Sale; and (ii) all
holders of then currently exercisable rights to acquire, directly or indirectly,
shares of any class of Common Stock will be given an opportunity either to (A)
exercise such rights prior to the consummation of the Approved Sale and
participate in such sale as holders of such class of Common Stock or (B) upon
the consummation of the Approved Sale, receive in exchange for such rights
consideration equal to the amount determined by multiplying (1) the same amount
of consideration per share of such class of Common Stock receivable by the
holders of such class of Common Stock in connection with the Approved Sale less
the exercise price or conversion price per share of such class of Common Stock
of such right to acquire, directly or indirectly, such class of Common Stock by
(2) the number of shares of such class of Common Stock represented by such
rights.

         (d)      If the Company or the Sale Stockholders enter into any
negotiation or transaction for which Rule 506 promulgated under the Securities
Act (or any similar rule then in effect) may be available with respect to such
negotiation or transaction (including a merger, consolidation or other
reorganization) , the holders of Stockholder Shares will, at the request of the
Board, appoint a purchaser representative (as such term is defined in Rule 501
promulgated under the Securities Act) reasonably acceptable to the Board. If any
holder of Stockholder Shares appoints the purchaser representative designated by
the Board, the Company will pay the fees of such purchaser representative, but
if any holder of Stockholder Shares declines to appoint the purchaser
representative designated by the Board, such holder will appoint another
purchaser representative (reasonably acceptable to the Board), and such holder
will be responsible for the fees of the purchaser representative so appointed.

         (e)      Each holder of Stockholder Shares (other than Silicon) will
bear its pro rata share (based upon the aggregate proceeds received by such
Stockholder) of the costs of any sale of Stockholder Shares pursuant to an
Approved Sale to the extent such costs are incurred for the benefit of all
holders of Stockholder Shares and are not otherwise paid by the Company or the
acquiring party. Costs incurred by any holder of Stockholder Shares on its own
behalf will not be considered costs of the transaction hereunder.

         (f)      The provisions of this Section 3 will terminate upon the 
completion of a Qualified Public Offering.

         4.       LIMITED PREEMPTIVE RIGHTS.


<PAGE>   7
                                      -7-


         (a)      Except for the issuance of Common Stock (i) to the Company's
or its Subsidiaries' employees (or pursuant to options or rights granted to
persons who were employees at the Company or its Subsidiaries as of the date of
grant) or (ii) pursuant to a public offering registered under the Securities
Act, if the Company or any of its Subsidiaries authorizes the issuance or sale
of any of its securities (other than as a dividend on the outstanding common
Stock) to a Person (or group of affiliated Persons) who holds, or would hold
after giving effect to such issuance or sale, at least 5% of the outstanding
Common Stock or securities convertible or exercisable into at least 5% of the
outstanding Common Stock, the Company shall first offer to sell to each holder
of Investor Shares a portion of such stock or securities equal to the quotient
determined by dividing (A) the number of shares of Common Stock held by such
holder by (B) the total number of shares of outstanding Common Stock. Each
Purchaser shall be entitled to purchase such stock or securities at the most
favorable price and on the most favorable terms as such stock or securities are
to be offered to such other Persons. The purchase price for all stock and
securities offered to the Purchasers shall be payable in cash.

         (b)      In order to exercise its purchase rights hereunder, a holder
of Investor Shares must within 30 days after receipt of written notice from the
Company describing in reasonable detail the stock or securities being offered,
the purchase price thereof, the payment terms and such holder's percentage
allotment deliver a written notice to the Company describing its election
hereunder. If all of the stock and securities offered to the holders of Investor
Shares is not fully subscribed by such holders, the remaining stock and
securities shall be reoffered by the Company to the holders purchasing their
full allotment upon the terms set forth in this paragraph, except that such
holders must exercise their purchase rights within five days after receipt of
such reoffer.

         (c)      Upon the expiration of the offering periods described above,
the Company shall be entitled to sell such stock or securities which the holders
of Investor Shares have not elected to purchase during the 90 days following
such expiration on terms and conditions no more favorable to the purchasers
thereof than those offered to such holders. Any stock or securities offered or
sold by the Company to a Person (or group of affiliated Persons) who held 5% of
the outstanding Common Stock after such 90-day period must be reoffered to the
holders of Investor Shares pursuant to the terms of this paragraph.

         (d)      The rights under this paragraph shall terminate upon
completion of a Qualified Public Offering.

         5.       INITIAL PUBLIC OFFERING. In the event that the Company, the
holders of a majority of the William Blair Shares and the holders of a majority
of the Information Partners Shares approve an initial public offering and sale
of the Company's equity securities (a "Public Offering") pursuant to an
effective registration statement under the Securities Act, the Stockholders will
take all necessary and desirable actions reasonably required in connection with
the consummation of the Public Offering, provided that minority stockholders of
the Company shall not be required to take any actions other than those typically
applicable to minority 

<PAGE>   8
                                      -8-



stockholders. In the event that such Public offering is an underwritten offering
and the managing underwriters advise the Company in writing that in their
opinion the Common Stock structure will adversely affect the marketability of
the offering, the Stockholders will vote for a recapitalization and/or exchange
of the Stockholder Shares into securities the managing underwriters and the
Board find acceptable; provided that the resulting securities provide each
Stockholder with the same relative economic interest as such Stockholder had
prior to such recapitalization and/or exchange and is consistent with the rights
and preferences set forth in the Certificate of Incorporation as in effect
immediately prior to such Public Offering. The Company will not file any
registration statement under the Securities Act that refers to Silicon by name
or otherwise as the holder of any securities of the Company, except to the
extent required by applicable laws and regulations.

         6.       COVENANTS.

         (a)      FINANCIAL STATEMENTS AND OTHER INFORMATION. The Company shall
deliver to each Qualified Holder:

                  (i)      as soon as available but in any event within 60 days
after the end of each quarterly accounting period in each fiscal year, unaudited
consolidating and consolidated statements of income and cash flows of the
Company and its Subsidiaries for such quarterly period and for the period from
the beginning of the fiscal year to the end of such quarter, and consolidating
and consolidated balance sheets of the Company and its Subsidiaries as of the
end of such quarterly period, setting forth in each case comparisons to the
annual budget and to the corresponding period in the preceding fiscal year, and
all such statements shall be prepared in accordance with generally accepted
accounting principles, consistently applied, subject to the absence of footnote
disclosures and to normal year-end adjustments;

                  (ii)     within 120 days after the end of each fiscal year,
consolidating and consolidated statements of income and cash flows of the
Company and its Subsidiaries for such fiscal year, consolidating and
consolidated balance sheets of the Company and its Subsidiaries as of the end of
such fiscal year, setting forth in each case comparisons to the annual budget
and to the preceding fiscal year, all prepared in accordance with generally
accepted accounting principles, consistently applied, and accompanied by (A)
with respect to the consolidated portions of such statements, an opinion of an
independent accounting firm of national recognized standing and (B) a copy of
such firm's annual management letter to the board of directors;

                  (iii)    promptly upon receipt thereof, any additional
reports, management letters or other information concerning significant aspects
of the Company's operations or financial affairs given to the Company by its
independent accountants (and not otherwise contained in other materials provided
hereunder); and

                  (iv)     at least 30 days prior to the beginning of each
fiscal year, an annual budget prepared on a monthly basis for the Company and
its Subsidiaries for such fiscal year (displaying 

<PAGE>   9
                                      -9-


anticipated statements of income and cash flows and balance sheets), and
promptly upon preparation thereof any other budgets prepared by the Company and
any revisions of such annual or other budgets.

         Except as otherwise required by law or judicial order or decree or by
any governmental agency or authority, each Stockholder entitled to receive
information regarding the Company and its Subsidiaries under this paragraph 6(a)
shall use its best efforts to maintain the confidentiality of all nonpublic
information obtained by it hereunder which the Company has reasonably designated
as proprietary or confidential in nature; provided that each such Stockholder
may disclose such information in connection with the sale or transfer of any
Stockholder Shares if such Stockholder's transferee agrees in writing to be
bound by the provisions hereof.

         (b)      INSPECTION OF PROPERTY. The Company shall permit any
representatives designated by any Qualified Holder upon reasonable notice and
during normal business hours and such other times as any such holder may
reasonably request, to (i) visit and inspect any of the properties of the
Company and its Subsidiaries, (ii) examine the corporate and financial records
of the Company and its Subsidiaries and make copies, thereof or extracts
therefrom and (iii) discuss the affairs, finances and accounts of any such
entities with the directors, officers, key employees and independent accountants
of the Company and its Subsidiaries. The presentation of an executed copy of
this Agreement by any Qualified Holder to the Company's independent accountants
shall constitute the Company's permission to its independent accountants to
participate in such discussions.

         7.       LEGEND. Each certificate evidencing Stockholder Shares and
each certificate issued in exchange for or upon the transfer of any Stockholder
Shares (if such shares remain Stockholder Shares as defined herein after such
Transfer) shall be stamped or otherwise imprinted with a legend in substantially
the following form:

                  "The securities represented by this certificate are subject to
                  certain transfer and voting restrictions pursuant to a
                  Stockholders Agreement dated as of September, 1993, among the
                  issuer of such securities (the "Company") and certain of the
                  Company's stockholders. A copy of such Stockholders Agreement
                  will be furnished without charge by the Company to the holder
                  hereof upon written request."

The Company shall imprint such legend on certificates evidencing Stockholder
Shares outstanding prior to the date hereof. The legend set forth above shall be
removed from the certificates evidencing any shares which cease to be
Stockholder Shares in accordance with paragraph 9 hereof.

         8.       TRANSFER. Prior to Transferring any Stockholder Shares
immediately (other than in a Public Sale or in a Sale of the Company) to any
person or entity, the transferring Stockholder 

<PAGE>   10
                                      -10-


shall cause the prospective transferee to execute and deliver to the Company and
the other Stockholders a counterpart of this Agreement.

         9.       DEFINITIONS.

         "AFFILIATE" of a Stockholder means any other person, entity or
investment fund controlling, controlled by or under common control with the
Stockholder and, in the case of an Investor which is a partnership, any partner
of the Investor.

         "CERTIFICATE OF INCORPORATION" means the Company's certificate of
incorporation in effect at the time as of which any determination is being made.

         "FAMILY GROUP" means a stockholder's spouse and descendants (whether or
not adopted) and any trust solely for the benefit of the Stockholder and/or the
Stockholder's spouse and/or descendants.

         "INDEPENDENT THIRD PARTY" means any person who, immediately prior to
the contemplated transaction, does not own in excess of 5% of the Company's
Common Stock on a fully-diluted basis (a "5% Owner)", who is not controlling,
controlled by or under common control with any such 5% Owner and who is not the
spouse or descendent (by birth or adoption) of any such 5% Owner or a trust for
the benefit of such 5% Owner and/or such other person.

         "INFORMATION PARTNERS SHARES" means (i) any shares of Common Stock
purchased by Information Partners and the persons set forth on Schedule A
pursuant to the Purchase Agreement (the "Information Partners Group"), (ii) any
equity securities issued or issuable directly or indirectly with respect to the
Common Stock referred to in clause (i) by way of stock dividend or stock split
or in connection with a combination of shares, recapitalization, merger,
consolidation or other reorganization and (iii) any other shares of Common Stock
originally issued to the Information Partners Group. As to any particular shares
constituting Information Partners Shares, such shares will cease to be
Information Partners Shares when they have been (x) effectively registered under
the Securities Act and disposed of in accordance with the registration statement
covering them, or (y) sold to the public through a broker, dealer or market
maker pursuant to Rule 144 (or by similar provision then in force) under the
Securities Act.

         "INVESTOR SHARES" means the William Blair Shares and the Information 
Partners Shares.

         "PERSON" means an individual, a partnership, a corporation, an
association, a joint stock company, a trust, a joint venture, an unincorporated
organization and a governmental entity or any department, agency or political
subdivision hereof.

         "PUBLIC SALE" means any sale of Stockholder Shares to the public
pursuant to an offering registered under the Securities Act or to the public
through a broker, dealer or market maker pursuant to the provisions of Rule 144
adopted under the Securities Act.


<PAGE>   11

                                      -11-


         "QUALIFIED HOLDERS" means any holder (or group of affiliated holders)
of Investor Shares representing 5% or more of the outstanding Investor Shares.

         "QUALIFIED PUBLIC OFFERING" means the sale in an underwritten public
offering registered under the Securities Act of shares of the Company's Common
Stock having an aggregate value of at least $10 million.

         "SALE OF THE COMPANY" means the sale of the Company to an Independent
Third Party or group of Independent Third Parties pursuant to which such party
or parties acquire (i) capital stock of the Company possessing the voting power
under normal circumstances to elect a majority of the Company's board of
directors (whether by merger, consolidation, sale, transfer or exchange of the
Company's capital stock) or (ii) all or substantially all of the Company's
assets determined on a consolidated basis.

         "SECURITIES ACT" means the Securities Act of 1933, as amended from time
to time.

         "SILICON SHARES" means (i) any shares of Common Stock issued or
issuable pursuant to that certain Stock Purchase Warrant ("Warrant") issued by
the Company to Silicon, dated the date hereof and (ii) any equity securities
issued or issuable directly or indirectly with respect to the Common Stock
referred to in clause (i) by way of stock dividend or stock split or in
connection with a combination of shares, recapitalization, merger, consolidation
or other reorganization. As to any particular shares constituting Silicon
Shares, such shares will cease to be Silicon Shares when they have been (x)
effectively registered under the Securities Act and disposed of in accordance
with the registration statement covering them, or (y) sold to the public through
a broker, dealer or market maker pursuant to Rule 144 (or by similar provision
then in force) under the Securities Act.

         "STOCKHOLDER SHARES" means the Information Partners Shares, the William
Blair Shares and the Silicon Shares.

         "SUBSIDIARY" means any corporation of which the securities having a
majority of the ordinary voting power in electing the board of directors are, at
the time as of which any determination is being made, owned by the Company
either directly or through one or more Subsidiaries.

         "WILLIAM BLAIR SHARES" means (i) any Common Stock purchased by William
Blair pursuant to the Purchase Agreement, (ii) any equity securities issued or
issuable directly or indirectly with respect to the Common Stock referred to in
clause (i) by way of stock dividend or stock split or in connection with a
combination of shares, recapitalization, merger, consolidation or other
reorganization and (iii) any other shares of Common Stock originally issued to
William Blair. As to any particular shares constituting William Blair Shares,
such shares will cease to be William Blair Shares when they have been (x)
effectively registered under the Securities Act and 

<PAGE>   12
                                      -12-


disposed of in accordance with the registration statement covering them, or (y)
sold to the public through a broker, dealer or market maker pursuant to Rule 144
(or by similar provision then in force) under the Securities Act.

         10.      TRANSFERS IN VIOLATION OF AGREEMENT. Any Transfer or attempted
Transfer of any Stockholder Shares in violation of any provision of this
Agreement shall be void, and the Company shall not record such Transfer on its
books or treat any purported transferee of such Stockholder Shares as the owner
of such shares for any purpose.

         11.      AMENDMENT AND WAIVER. Except as otherwise provided herein, no
modification, amendment or waiver of any provision of this Agreement shall be
effective against the Company or the Stockholders unless such modification,
amendment or waiver is approved in writing by the Company and the holders of at
least a majority of the then outstanding William Blair Shares and the holders of
at least a majority of the then outstanding Information Partners Shares,
respectively; provided, however, that in the event that such amendment or waiver
would adversely affect a holder or group of holders of Stockholder Shares in a
manner different from any other holder of Stockholder Shares, then such
amendment or waiver will require the consent of such holder or holders of a
majority of the Stockholder Shares of the group adversely affected. The failure
of any party to enforce any of the provisions of this Agreement shall in no way
be construed as a waiver of such provisions and shall not affect the right of
such party thereafter to enforce each and every provision of this Agreement in
accordance with its terms.

         12.      SEVERABILITY. Whenever possible, each provision of this
Agreement shall be interpreted in such manner as to be effective and valid under
applicable law, but if any provision of this Agreement is held to be invalid,
illegal or unenforceable in any respect under any applicable law or rule in any
jurisdiction, such invalidity, illegality or unenforceability shall not affect
any other provision or the effectiveness or validity of any provision in any
other jurisdiction, and this Agreement shall be reformed, construed and enforced
in such jurisdiction as if such invalid, illegal or unenforceable provision had
never been contained herein.

         13.      ENTIRE AGREEMENT. Except as otherwise expressly set forth
herein, this document, the Purchase Agreement, the Warrant, and the Registration
Agreement between the Company and the Stockholders embody the complete agreement
and understanding among the parties hereto with respect to the subject matter
hereof and supersede and preempt any prior understandings, agreements or
representations by or among the parties, written or oral, which may have related
to the subject matter hereof in any way.

         14.      SUCCESSORS AND ASSIGNS. Except as otherwise provided herein,
this Agreement shall bind and inure to the benefit of and be enforceable by the
Company and its successors and assigns and the Stockholders and any subsequent
holders of Stockholder Shares and the respective successors and assigns of each
of them, so long as they hold Stockholder Shares.


<PAGE>   13
                                      -13-


         15.      COUNTERPARTS. This Agreement may be executed in separate
counterparts each of which shall be an original and all of which taken together
shall constitute one and the same agreement.

         16.      REMEDIES. The parties hereto agree and acknowledge that money
damages may not be an adequate remedy for any breach of the provisions of this
Agreement and that the Company and any Stockholder shall have the right to
injunctive relief, in addition to all of its rights and remedies at law or in
equity, to enforce the provisions of this Agreement. Nothing contained in this
Agreement shall be construed to confer upon any Person who is not a signatory
hereto any rights or benefits, as a third party beneficiary or otherwise.

         17.      ARBITRATION.

         (a)      ARBITRATION. In the event of disputes between the parties with
respect to the terms and conditions of this Agreement, such disputes shall be
resolved by and through an arbitration proceeding to be conducted under the
auspices of the American Arbitration Association (or any like organization
successor thereto) at Boston, Massachusetts. Such arbitration proceeding shall
be conducted in as expedited a manner as is then permitted by the commercial
arbitration rules (formal or informal) of the American Arbitration Association,
and the arbitrator or arbitrators in any such arbitration shall be persons who
are expert in the subject matter of the dispute. Both the foregoing agreement of
the parties to arbitrate any and all such claims, and the results,
determination, finding, judgment and/or award rendered through such arbitration,
shall be final and binding on the parties hereto and may be specifically
enforced by legal proceedings. The parties agree and acknowledge that money
damages may not be an adequate remedy for any breach of the provisions of this
Agreement and that any party may, in his or its sole discretion, ask for
specific performance and/or injunctive relief in order to enforce or prevent any
violations of the provisions of this Agreement.

         (b)      PROCEDURE. Such arbitration may be initiated by written notice
from either party to the other which shall be a compulsory and binding
proceeding on each party. The arbitration shall be conducted before a panel of
arbitrators selected in accordance with the rules of the American Arbitration
Association. The costs of said arbitrators and the arbitration shall be borne
equally by the parties thereto. Each party shall bear separately the cost of
their respective attorneys, witnesses and experts in connection with such
arbitration. Time is of the essence of this arbitration procedure, and the
arbitrators shall be instructed and required to render their decision within ten
(10) days following completion of the arbitration.

         (c)      VENUE AND JURISDICTION. Any and all legal proceedings to
enforce this Agreement (including any action to compel arbitration hereunder or
to enforce any award or judgment rendered thereby), shall be governed in
accordance with this paragraph 17.

         18.      NOTICES. Any notice provided for in this Agreement shall be in
writing and shall be either personally delivered, or received by certified mail,
return receipt requested, or sent by 

<PAGE>   14
                                      -14-


reputable overnight courier service (charges prepaid) to the Company at the
address set forth below and to any other recipient at the address indicated on
the schedules hereto and to any subsequent holder of Stockholder Shares subject
to this Agreement at such address as indicated by the Company's records, or at
such address or to the attention of such other person as the recipient party has
specified by prior written notice to the sending party. Notices will be deemed
to have been given hereunder when delivered personally, three days after deposit
in the U.S. mail and one day after deposit with a reputable overnight courier
service. The Company's address is:

                           OneSource Holding Corporation
                           c/o Information Partners Capital Fund, L.P.
                           Two Copley Place
                           Boston, MA 02116
                           Attention: David Dominik

                           With copies to:

                           Information Partners Capital Fund, L.P.
                           Two Copley Place
                           Boston, MA 02116
                           Attention: David Dominik

                           and

                           William Blair Venture Partners
                           135 South LaSalle Street
                           Chicago, Illinois 60603
                           Attention: Gregg Newmark

         19.      GOVERNING LAW. All issues concerning this Agreement shall be
governed by and construed in accordance with the laws of the State of Delaware,
without giving effect to any choice of law or conflict of law provision or rule
(whether of the State of Delaware or any other jurisdiction) that would cause
the application of the law of any jurisdiction other than the State of Delaware.

         20.      DESCRIPTIVE HEADINGS. The descriptive headings of this
Agreement are inserted for convenience only and do not constitute a part of this
Agreement.

                                    * * * * *


<PAGE>   15
                                      -15-


IN WITNESS WHEREOF, the parties hereto have executed this Agreement on the day
and year first above written.

                           ONESOURCE HOLDING CORPORATION
                           By: ________________________________________
                           Its: _______________________________________

                           WILLIAM BLAIR VENTURE PARTNERS III
                           LIMITED PARTNERSHIP

                           By: William Blair Venture Management Company
                           Its: General Partner


                           By: ________________________________________
                           Its: General Partner


                           INFORMATION PARTNERS CAPITAL FUND, L. P.

                           By: Information Partners
                           Its: General Partner

                           By: ________________________________________
                           Its: General Partner


                           BCIP ASSOCIATES

                           By: ________________________________________
                           Its: _______________________________________


                           BCIP TRUST ASSOCIATES, L.P.

                           By: ________________________________________
                           Its: _______________________________________


                           SILICON VALLEY BANK

                           By: ________________________________________

<PAGE>   16

                                      -16-


                           Its: _______________________________________



                                   SCHEDULE A


                               OTHER SHAREHOLDERS

         BCIP Associates 
         BCIP Trust Associates, L.P.




<PAGE>   1
                                                                   EXHIBIT 10.15


                               AMENDMENT NO. 1 TO
                             STOCKHOLDERS AGREEMENT

         This Amendment No. 1 to Stockholders Agreement is made as of April 21,
1999, by and among OneSource Information Services, Inc., a Delaware corporation
("OneSource"), William Blair Venture Partners III Limited Partnership,
Information Partners Capital Fund, L.P., BCIP Associates, and BCIP Trust
Associates, L.P.

         WHEREAS, the parties hereto are parties to that certain Stockholders
Agreement dated as of September 8, 1993 (the "Stockholders Agreement"), pursuant
to which the parties agreed to provide for certain rights and obligations with
respect to the shares held by them of Class P Common Stock, par value $.01 per
share and Common Stock, $.01 par value per share of OneSource;

         WHEREAS, pursuant to Section 11 of the Stockholders Agreement, such
agreement may be amended with the consent of the parties hereto, such parties
being the holders of at least a majority of the currently outstanding William
Blair Shares and the holders of at least a majority of the currently outstanding
Information Partners Shares; and

         WHEREAS, the parties hereto desire to amend the Stockholders Agreement
as set forth below.

         NOW THEREFORE, in consideration of the premises and for other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto agree as follows:

         1.       The Stockholders Agreement shall be amended to add a new
Section 21 as follows:

         "21.     TERMINATION. This Agreement shall terminate in its entirety
upon the consummation by the Company of a Qualified Public Offering."

         2.       Capitalized terms used herein and not otherwise defined shall
have the meaning assigned to them in the Stockholders Agreement.

         3.       This Amendment No. 1 may be executed in counterparts, each of
which shall be deemed an original, but all such counterparts, taken together,
shall constitute one and the same instrument.

         4.       In all other respects, the Stockholders Agreement shall remain
in full force and effect.


<PAGE>   2

         IN WITNESS WHEREOF, the parties hereto have executed this Amendment No.
1 as of the day and year first above written.

                                    ONESOURCE INFORMATION SERVICES, INC.


                                    By:  /s/ Daniel Schimmel
                                        ----------------------------------------
                                        Daniel Schimmel
                                        President

                                    WILLIAM BLAIR VENTURE PARTNERS III
                                    LIMITED PARTNERSHIP

                                    By: William Blair Venture Management Company
                                        Its General Partner

                                        By:  /s/ Gregg Newmark
                                            ----------------------------------- 
                                        Name: Gregg Newmark
                                        Title:

                                    INFORMATION PARTNERS CAPITAL FUND, L.P.

                                    By: Information Partners
                                        Its General Partner

                                        By:  /s/ David Dominik
                                            ------------------------------------
                                        Name: David Dominik
                                        Title:


                                    BCIP ASSOCIATES

                                    By: /s/ David Dominik
                                       ---------------------------------------- 
                                    Name: David Dominik
                                    Title:

                                    BCIP TRUST ASSOCIATES, L.P.

                                    By: /s/ David Dominik
                                       ---------------------------------------- 
                                    Name: David Dominik
                                    Title:

<PAGE>   1
                                                                   Exhibit 10.16

                            FEE TERMINATION AGREEMENT
                            -------------------------

     AGREEMENT, dated as of _______________, 1999, by and between OneSource
Information Services, Inc., a Delaware corporation (the "Company"), Bain
Capital, Inc. ("Bain") and William Blair Venture Partners III Limited
Partnership ("Blair").

     The Company currently pays each of Bain and Blair an annual advisory fee of
$100,000 for services which they render to the Company (the "Advisory Fee"). The
Company is currently contemplating an initial public offering of its common
stock (the "IPO"). In connection with the IPO, the Company desires that the
Advisory Fee be terminated and to compensate Bain and Blair for such termination
and for services previously rendered, and Bain and Blair are willing to
terminate the Advisory Fee for the consideration described below.

     NOW THEREFORE, in consideration of the foregoing and the mutual covenants
and agreements set forth herein, the parties hereto agree as follows

     1.   FEE TERMINATION. Upon the consummation of the IPO, Bain and Blair
hereby agree that the Company's obligation to pay Bain and Blair the Advisory
Fee is hereby terminated. In consideration for the foregoing termination and for
services previously rendered to the Company, upon the closing of the IPO, the
Company shall pay to each of Bain and Blair an amount equal to $500,000, payable
in cash by wire transfer of immediately available funds.

     2.   Miscellaneous.
          -------------

     (a)  ASSIGNMENT. This Agreement shall be binding upon the parties hereto
and their successors and assigns.

     (b)  AMENDMENTS. This Agreement may not be modified, amended, altered or
supplemented except upon the execution and delivery of a written agreement
executed by the parties hereto.

     (c)  GOVERNING LAW. This Agreement shall be governed in all respects,
including validity interpretation and effects, by the laws of the State of
Delaware, without regard to the principles of conflicts of laws thereof

     (d)  SEVERABILITY. If any term, provision, covenant or restriction of this
Agreement is held by a court or a governmental agency of competent jurisdiction
to be invalid, void or unenforceable, or cause any party hereto to be in
violation of any applicable provision of law, the remainder of the terms,
provisions, covenants and restrictions of this Agreement shall remain in full
force and effect and shall in no way be affected impaired or invalidated.


<PAGE>   2


                                      -2-


     IN WITNESS WHEREOF, Purchaser and Seller have caused this Agreement to be
signed as of the date first above written.

                                   ONESOURCE INFORMATION SERVICES, INC.

                                   By:
                                      ------------------------------------------
                                   Its:
                                       -----------------------------------------


                                   BAIN CAPITAL, INC.

                                   By:
                                      ------------------------------------------
                                      A Managing Director



                                   WILLIAM BLAIR VENTURE PARTNERS II
                                   LIMITED PARTNERSHIP

                                   By:  William Blair Venture Management Company
                                   Its: General Partner

                                   By:
                                      ------------------------------------------
                                      A General Partner




<PAGE>   1
                                                                   EXHIBIT 10.17


                           STOCK REDEMPTION AGREEMENT

         THIS STOCK REDEMPTION AGREEMENT, dated as of April 21, 1999 (this
"Agreement"), is made by and among OneSource Information services, Inc., a
Delaware corporation (the "Company"), and the persons set forth on the "Schedule
of Class P Stockholders" attached hereto (hereinafter referred to collectively
as the "Class P Stockholders" and individually as a "Class P Stockholder").

         WHEREAS, the shares of the Company's Class P Common Stock, par value
$.0l per share (the "Class P Common Stock"), are to be reclassified in
connection with the Company's initial public offering (the "IPO"); and

         WHEREAS, the shares of the Company's Common Stock, par value $.0l per
share (the "Common Stock"), will be issued in the reclassification and the
Company desires to purchase, and the Class P Stockholders desire to sell,
certain of these shares;

         NOW, THEREFORE, The parties hereto agree as follows:

         1.       PURCHASE AND SALE. Each Class P Stockholder will sell to the
Company and the Company will purchase from each Class P Stockholder, the number
of shares of Common Stock issued as "Yield Shares" to such Class P Stockholder
under Article Four, Part B, Section 8 of the Company's Amended and Restated
Certificate of Incorporation, as amended, at a purchase price per share equal to
the price to the public for each share of Common Stock in the IPO.

         Each Class P Stockholder hereby irrevocably constitutes and appoints
the Company as his or her attorney-in-fact and agent to execute and deliver all
documents necessary or appropriate to effect such sale and to complete the
transaction described in this Agreement.

         2.       THE CLOSING. The closing of the sales and purchases of the
Common Stock (the "Closing") will take place at the offices of Testa, Hurwitz &
Thibeault, LLP, High Street Tower, 125 High Street, Boston, Massachusetts 02110
on the date of the closing of the IPO (the "Closing Date"), or at such other
place or on such other date as may be mutually agreeable to the Company and the
Class P Stockholders. At the Closing, each Class P Stockholder will deliver to
the Company a certificate or certificates evidencing the number of shares of
Common Stock to be purchased by the Company against payment of the purchase
price therefor by delivery of a cashier's or certified check or checks of
immediately available funds or by wire transfer to a bank account designated by
such Class P Stockholder.

         3.       AMENDMENTS AND WAIVERS; TERMINATION. Except as otherwise
provided herein, no modification, amendment or waiver of any provision hereof
shall be effective against the Company or the Class P Stockholders unless such
modification, amendment or waiver is approved in writing by the Company and the
holders of at least a majority of the outstanding 




<PAGE>   2
                                      -2-


shares of Class P Common Stock; provided that any amendment which treats any
holder of Class P Common Stock in a manner different from any other holder of
Class P Common Stock shall require the consent of the holders of all Class P
Common Stock. The failure of any party to enforce any provision of this
Agreement or under any agreement contemplated hereby or under the Company's
certificate of incorporation or bylaws shall in no way be construed as a waiver
of such provisions and shall not affect the right of such party thereafter to
enforce each and every provision of this Agreement, any agreement referred to
herein, the Company's certificate of incorporation, or bylaws in accordance with
their terms. If the Closing has not occurred on or before December 31, 1999,
this Agreement shall terminate and have no further force or effect.

         4.       SUCCESSORS AND ASSIGNS. Except as otherwise expressly provided
herein, all covenants and agreements contained in this Agreement by or on behalf
of any of the parties hereto will bind and inure to the benefit of the
respective successors and assigns of such parties whether so expressed or not.

         5.       SEVERABILITY. Whenever possible, each provision of this
Agreement will be interpreted in such manner as to be effective and valid under
applicable law, but if any provision of this Agreement is held to be invalid,
illegal or unenforceable under any applicable law or rule in any jurisdiction,
such provision will be ineffective only to the extent of such invalidity,
illegality or unenforceability in such jurisdiction, without invalidating the
remainder of this Agreement in such jurisdiction or any provision hereof in any
other jurisdiction.

         6.       COUNTERPARTS. This Agreement may be executed simultaneously in
two or more counterparts, any one of which need not contain the signatures of
more than one party, but all such counterparts taken together will constitute
one and the same agreement.

         7.       DESCRIPTIVE HEADINGS. The descriptive headings of this
Agreement are inserted for convenience only and do not constitute a part of this
Agreement.

         8.       GOVERNING LAW. All issues concerning the enforceability,
validity and binding effect of this Agreement shall be governed by and construed
in accordance with the laws of the State of Delaware, without giving effect to
any choice of law or conflict of law provision or rule (whether of the State of
Delaware or any other jurisdiction) that would cause the application of the law
of any jurisdiction other than the State of Delaware.

         9.       NOTICES. All notices, demands or other communications to be
given or delivered under or by reason of the provisions of this Agreement will
be in writing and will be deemed to have been given when personally delivered or
received by certified mail, return receipt requested, or sent by guaranteed
overnight courier service. Notices, demands and communications will be sent to
each Class P Stockholders at such Class P Stockholder's address as indicated in
the Company's books and records of the Company's transfer agent and registrar
and to the Company at the address indicated below:

     NOTICES TO THE COMPANY:


<PAGE>   3
                                      -3-


         OneSource Information Services, Inc.
         150 Cambridge Park Drive
         Cambridge, MA 02140
         Attention: President


         WITH A COPY TO:

         Testa, Hurwitz & Thibeault, LLP
         High Street Tower
         125 High Street
         Boston, MA 02110
         Attention: Lawrence S. Wittenberg, Esq.

or to such other address or to the attention of such other person as the
recipient party has specified by prior written notice to the sending party.

                                    * * * * *


<PAGE>   4
                                      -4-


         IN WITNESS WHEREOF, the parties hereto have executed this Agreement o
the day and year first above written.

                                      ONESOURCE INFORMATION SERVICES, INC.

                                      By: /s/ Daniel Schimmel
                                          --------------------------------------
                                      Its: President

                                      WILLIAM BLAIR VENTURE PARTNERS III
                                      LIMITED PARTNERSHIP

                                      By: William Blair Venture Management
                                          Company

                                      Its: General Partner


                                      By: /s/ Gregg Newmark
                                          --------------------------------------
                                      Its: General Partner

                                      INFORMATION PARTNERS CAPITAL FUND, L.P.

                                      By: Information Partners
                                      Its: General Partner


                                      By: /s/ David Dominik
                                          --------------------------------------
                                      Its: General Partner


                                      BCIP ASSOCIATES


                                      By: /s/ David Dominik
                                          --------------------------------------
                                      Its: General Partner


                                      BCIP TRUST ASSOCIATES, L.P.


                                      By: /s/ David Dominik
                                          --------------------------------------
                                      Its: General Partner


<PAGE>   5
                                      -5-


                                      /s/ Martin F. Kahn
                                      ------------------------------------------
                                      Martin F. Kahn


                                      /s/ Daniel J. Schimmel
                                      ------------------------------------------
                                      Daniel J. Schimmel


                                      /s/ Roland Perkins
                                      ------------------------------------------
                                      Roland Perkins


                                      /s/ James A. Becker
                                      ------------------------------------------
                                      James A. Becker


                                      /s/ Brett Tomlinson
                                      ------------------------------------------
                                      Brett Tomlinson


                                      /s/ Roy Landon
                                      ------------------------------------------
                                      Roy Landon


                                      /s/ Phil Garlick
                                      ------------------------------------------
                                      Phil Garlick


                                      /s/ Reilly F. Cobb
                                      ------------------------------------------
                                      Reilly F. Cobb


                                      /s/ Mark C. VanDine
                                      ------------------------------------------
                                      Mark C. VanDine


                                      /s/ Anthony J. Baublis
                                      ------------------------------------------
                                      Anthony J. Baublis


                                      /s/ Terence S. Murtaugh
                                      ------------------------------------------
                                      Terence S. Murtaugh

<PAGE>   6
                                      -6-





                                      ------------------------------------------
                                      Karen G. Cruise


                                      /s/ Frank J. Hermes
                                      ------------------------------------------
                                      Frank J. Hermes


<PAGE>   7


                        SCHEDULE OF CLASS P STOCKHOLDERS




NAMES AND ADDRESSES
- -------------------

William Blair Venture
  Partners III Limited
  Partnership
135 South LaSalle Street
Chicago, Illinois 60603

Information Partners
  Capital Fund, L.P.
Two Copley Place
Boston, MA 02116
Attention: David Dominik

BCIP Associates
c/o Information Partners 
Capital Fund, L.P.
Two Copley Place
Boston, MA 02116
Attention: David Dominik

BCIP Trust Associates, L.P.
c/o Information Partners 
Capital Fund, L.P.
Two Copley Place
Boston, MA 02116
Attention: David Dominik

Martin F. Kahn
c/o Cadence Information 
Associates
767 5th Avenue, 43rd Fl.
New York, N.Y. 10153

Daniel J. Schimmel
c/o OneSource Information 
Services, Inc.
150 CambridgePark Drive
Cambridge, MA 02140


<PAGE>   8
                                      -8-


Roland Perkins
83 Lincoln Road
Wayland, MA 01778

James A. Becker
c/o OneSource Information 
Services, Inc.
150 CambridgePark Drive
Cambridge, MA 02140

Brett Tomlinson
34 Elmhurst Road
Arlington, MA 02174

Roy Landon
c/o OneSource Information 
Services, Inc.
150 CambridgePark Drive,
Cambridge, MA 02140

Phillip Garlick
c/o OneSource Information 
Services, Inc.
150 CambridgePark Drive
Cambridge, MA 02140

Reilly F. Cobb
50 Bellingham Road
Chestnut Hill, MA 02167

Mark C. VanDine
c/o OneSource Information 
Services, Inc.
150 CambridgePark Drive
Cambridge, MA 02140

Anthony J. Baublis
65 Century Way
Gardner, MA 01440

Terrence S. Murtaugh
21 Dean Street
Belmon, MA 02178

Karen G. Cruise
1 Starwood Crossing
Andover, MA 01929


<PAGE>   9
                                      -9-



Frank J. Hermes
80 Woodmere Drive
Sudbury, MA 01776

<PAGE>   1
                                                                  Exhibit 23.02

                       CONSENT OF INDEPENDENT ACCOUNTANTS
                       ----------------------------------

   
We hereby consent to the use in the Prospectus constituting part of this
Registration Statement on Form S-1 of our report dated February 26, 1999, except
for Note 6, as to which the date is April 13, 1999, relating to the consolidated
financial statements of OneSource Information Services, Inc., which appears in
such Prospectus.  We also consent to the application of such report to the
Consolidated Financial Statement Schedules for the three years ended December
31, 1998 listed under Item 16.(b) of this Registration Statement when such
schedules are read in conjunction with the consolidated financial statements
referred to in our report.  The audits referred to in such reports also included
these schedules.  We also consent to the reference to us under the heading
"Experts" in such Prospectus.
    


/s/ PricewaterhouseCoopers LLP


   
Boston, Massachusetts
April 22, 1999
    

<PAGE>   1
                                                                   EXHIBIT 23.03


                                     CONSENT

         The undersigned hereby consents to the use of its name in the
Registration Statement on Form S-1, as amended and the Prospectus in connection
therewith for OneSource Information Services Inc. (the "Company") to be used by
the Company in connection with its initial public offering.

         IN WITNESS WHEREOF, the undersigned has executed this consent as of the
10th day of April, 1999.




                                                  Simba Information Inc.


                                                  By: /s/ Harry L. Baisden
                                                      --------------------------
                                                  Name: Harry L. Baisden
                                                  Title: Editorial Director

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
COMPANY'S REGISTRATION STATEMENT ON FORM S-1 AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH REGISTRATION STATEMENT ON FORM S-1.
</LEGEND>
<CIK> 0001079880
<NAME> ONESOURCE INFORMATION SERVICES, INC.
<MULTIPLIER> 1
<CURRENCY> U.S. DOLLARS
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               DEC-31-1998
<EXCHANGE-RATE>                                      1
<CASH>                                           8,665
<SECURITIES>                                         0
<RECEIVABLES>                                    9,921
<ALLOWANCES>                                       300
<INVENTORY>                                          0
<CURRENT-ASSETS>                                25,374
<PP&E>                                           5,804
<DEPRECIATION>                                   4,034
<TOTAL-ASSETS>                                  27,646
<CURRENT-LIABILITIES>                           27,492
<BONDS>                                              0
                                0
                                          0
<COMMON>                                         3,592
<OTHER-SE>                                     (9,903)
<TOTAL-LIABILITY-AND-EQUITY>                    27,646
<SALES>                                         30,428
<TOTAL-REVENUES>                                30,428
<CGS>                                           13,655
<TOTAL-COSTS>                                   13,655
<OTHER-EXPENSES>                                21,737
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 595
<INCOME-PRETAX>                                  7,238
<INCOME-TAX>                                       250
<INCOME-CONTINUING>                              6,988
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     6,988
<EPS-PRIMARY>                                     0.85
<EPS-DILUTED>                                     0.59
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
COMPANY'S REGISTRATION STATEMENT ON FORM S-1 AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH REGISTRATION STATEMENT ON FORM S-1
</LEGEND>
<CIK> 0001079880
<NAME> ONESOURCE INFORMATION SERVICES, INC.
<MULTIPLIER> 1
<CURRENCY> U.S. DOLLARS
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          MAR-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               MAR-31-1999
<EXCHANGE-RATE>                                      1
<CASH>                                           6,739
<SECURITIES>                                         0
<RECEIVABLES>                                    5,110
<ALLOWANCES>                                       288
<INVENTORY>                                          0
<CURRENT-ASSETS>                                17,928
<PP&E>                                           6,036
<DEPRECIATION>                                   4,248
<TOTAL-ASSETS>                                  20,723
<CURRENT-LIABILITIES>                           20,929
<BONDS>                                              0
                                0
                                          0
<COMMON>                                         3,591
<OTHER-SE>                                    (10,246)
<TOTAL-LIABILITY-AND-EQUITY>                    20,723
<SALES>                                          8,143
<TOTAL-REVENUES>                                 8,143
<CGS>                                            3,457
<TOTAL-COSTS>                                    3,457
<OTHER-EXPENSES>                                 5,505
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                  93
<INCOME-PRETAX>                                  (412)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                              (412)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     (412)
<EPS-PRIMARY>                                   (0.08)
<EPS-DILUTED>                                   (0.08)
        

</TABLE>


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