SECURITIES AND EXCHANGE COMMISSION 
                               Washington, D.C. 20549
 
                                      FORM 8-K
                                          
                                   CURRENT REPORT

                           Pursuant to Section 13 or 15(d)
                        of the Securities Exchange Act of 1934

 
    Date of report (date of earliest event reported):  June 30, 1998
 
 

                          NIELSEN MEDIA RESEARCH, INC.
              (Exact name of registrant as specified in its charter)


  Delaware                  1-12275                       06-1450569
(State or other           (Commission                   (IRS Employer 
jurisdiction of           File Number)                  Identification No.)
incorporation) 


            299 Park Avenue
            New York, New York                           10171
     (Address of Principal Executive Offices)          (Zip Code)


Registrant's telephone number, including area code: (212) 708-7500









ITEM 5.    Other Events

     On January 15, 1998, the Board of Directors of the Registrant (formerly 
named Cognizant Corporation) approved in principle a plan to distribute to 
the holders of common stock of the Registrant (the "Distribution") all of the 
common stock of the Registrant's subsidiary, IMS Health Incorporated ("IMS 
HEALTH").  On June 15, 1998, the Registrant's Board of Directors formally 
approved the Distribution and declared a dividend payable to each holder of 
record of the Registrant's common stock at the close of business on June 25, 
1998 (the "Record Date") of one share of IMS HEALTH common stock for each 
share of the Registrant's common stock held by such holder at the close of 
business on the Record Date.  Prior to the Distribution, the Registrant 
contributed to IMS HEALTH all or substantially all of the businesses which 
comprise the IMS HEALTH business and which accounted for approximately 75% of 
the Registrant's revenues and 68% of the Registrant's operating income in 
1997. Certificates representing shares of IMS HEALTH common stock were mailed 
to stockholders of the Registrant on or about June 30, 1998.   The Registrant 
has received a ruling from the Internal Revenue Service to the effect that 
the Distribution will be tax-free to the Registrant and its stockholders.

     As a result of the Distribution, the Registrant has separated into two 
independent publicly traded companies: (i) IMS HEALTH, the leading global 
provider of information solutions to the pharmaceutical and healthcare 
industries and (ii) Nielsen Media Research, Inc., the leader in television 
audience measurement services in North America.  

     IMS HEALTH is a newly created Delaware corporation, the businesses of 
which focus on information solutions to the pharmaceutical and healthcare 
industries.  Covering over 90 countries with over 7,200 employees worldwide, 
IMS HEALTH's businesses include those of I.M.S. International, Inc., the 
leading global supplier of market information and decision-support services 
to the pharmaceutical and healthcare industries; Erisco, Inc., a leading 
supplier of software-based administrative and analytical solutions to the 
managed care industry; Cognizant Enterprises, Inc., a venture capital unit 
focused on investments in emerging healthcare businesses; Cognizant 
Technology Solutions Corporation, a provider of software application 
development and maintenance services and Year 2000 and Eurocurrency 
compliance services; SSJ K.K., an entity based in Japan which markets 
financial application software products and services tailored for the 
Japanese market; and an equity investment in Gartner Group, Inc., the leading 
supplier of research and analysis to the information technology industry.  
Shares of IMS HEALTH Common Stock trade on the New York Stock Exchange, Inc. 
(the "NYSE") under the symbol "RX".

     The Registrant is the leading source of television audience measurement 
services in North America. The Nielsen Media Research business, which prior 
to the Distribution had been conducted by the Registrant's subsidiary, 
Nielsen Media Research, Inc., continues to be conducted by the Registrant. At 
the time of the Distribution, such subsidiary was merged into the Registrant 
and as a result of such merger, the Registrant changed its name to Nielsen 
Media Research, Inc. The Registrant's common stock continues to trade on the 
NYSE after the Distribution, but the symbol under which it trades has been 
changed from "CZT" to "NMR".


                                        2


     As a result of the Distribution, the Registrant does not have any 
ownership interest in IMS HEALTH, and IMS HEALTH is an independent public 
company. In addition, IMS HEALTH does not have any ownership interest in the 
Registrant (other than 800,000 shares of common stock of the Registrant which 
IMS HEALTH has agreed to sell promptly after the Distribution).

     IMS HEALTH and the Registrant have entered into certain agreements 
governing the relationship between IMS HEALTH and the Registrant subsequent 
to the Distribution and providing for the allocation of tax, employee 
benefits and certain other assets and liabilities and obligations arising 
from periods prior to the Distribution, including contingent liabilities 
relating to certain litigation.  Forms of such agreements are filed as 
Exhibits 99.2 to 99.5 to this Form 8-K and are incorporated herein by 
reference.  In addition, Mr. Robert E. Weissman and Mr. M. Bernard Puckett 
currently serve on the boards of directors of both companies.

     In connection with the Distribution, the Registrant borrowed $300 
million, the proceeds of which were used to repay existing intercompany 
indebtedness to certain entities included in IMS HEALTH.  This debt is an 
obligation of the Registrant.  IMS HEALTH retained $100 million in 
pre-existing minority-interest financing.

Retroactive Restatement of Diluted Earnings Per Share Data

      In accordance with the methodology provided for in the Employee 
Benefits Agreement between Cognizant Corporation ("Cognizant") and IMS 
HEALTH Incorporated (attached hereto as Exhibit 99.4), each unexercised 
Cognizant stock option held by a Nielsen Media Research, Inc. ("Nielsen Media
Research") employee was converted into 12.3275 Nielsen Media Research stock 
options. The data below includes Nielsen Media Research's previously reported 
diluted earnings per share data adjusted retroactively to reflect the 
conversion of the unexercised Cognizant stock options held by Nielsen Media 
Research employees.



                                                    Nielsen Media Research Selected Financial Data

                                   Three Months
                                  Ended March 31,                            Year Ended December 31,
                             -------------------------   -------------------------------------------------------------------
                                1998          1997          1997          1996          1995          1994          1993
                             -----------   -----------   -----------   -----------   -----------   -----------   -----------
                                    (unaudited)                                                            (unaudited)
                                                                              ($ amounts in thousands,
                                                                               except per share data)
                                                                                            
Income Statement Data:
Operating Revenue                $96,064       $86,271      $358,594      $319,404      $288,652      $250,303      $209,894
Net Income                       $14,246       $12,730      $ 52,475      $ 47,605      $ 40,412      $ 30,115      $ 19,661
Earnings Per Share- Basic        $  0.09       $  0.07      $   0.32      $   0.28      $   0.24      $   0.18         --
Earnings Per Share -
 Diluted (as restated)           $  0.08       $  0.07      $   0.31      $   0.28      $   0.24      $   0.18         --
Average Number of Shares
 Outstanding - Basic         162,406,000   169,770,000   165,163,000   169,944,000   169,522,000   169,946,000

Dilutive Effect of Shares
 Issuable Under Stock
 Options (as restated)         8,889,163       133,038     3,541,974       729,418          --            --
Adjustment of Shares
 Applicable to Exercise of
 Stock Options (as restated)   2,400,879       123,928     2,646,307          --            --            --
                            ------------  ------------  ------------   ------------  ------------  ------------
Average Number of Shares
 Outstanding - Diluted
 (as restated)               173,696,042   170,026,967   171,351,282    170,673,418   169,522,000   169,946,000

Balance Sheet Data:
Total Assets                    $199,645      $178,598      $192,434       $170,331      $134,521      $138,842      $ 97,831
Long-Term Debt                  $      -      $      -      $      -       $      -      $     78      $    244      $    411



Proforma Earnings Per Share Data

      In addition, on July 8, 1998, the Board of Directors of Nielsen Media 
Research approved a 1-for-3 reverse stock split which is subject to 
shareholder approval by shareholders of record as of July 31, 1998 at a 
special meeting of shareholders to be held on August 26, 1998. If approved, 
shareholders at the close of business on the record date will receive one new 
share of Nielsen Media Research Common Stock in exchange for three old 
shares. As a result of the reverse stock split, basic and diluted earnings 
per share reflected on a proforma basis would be as follows (afer giving 
effect to the conversion of the unexercised Cognizant stock options to 
Nielsen Media Research stock options referred to above).



                                            Three Months
                                           Ended March 31,                          Year Ended December 31,
                                      -----------------------   -------------------------------------------------------------------
                                         1998         1997         1997          1996          1995          1994          1993
                                      ----------   ----------   -----------   -----------   -----------   -----------   -----------
                                                                                                   
Proforma Basic Earnings Per Share 
  - Unaudited                         $   0.26      $   0.22     $    .95      $    .84      $    .72      $    .54             -
                                                                                                                                 
Proforma Diluted Earnings Per Share   
  - Unaudited                         $   0.25      $   0.22     $    .92      $    .84      $    .72      $    .54             -



     Attached hereto as Exhibit 99.1 is the Information Statement dated as of 
June 22, 1998 (the "Information Statement") which the Registrant has sent to 
each of the record holders of its common stock as of the close of business on 
the Record Date.  The Information Statement contains additional information 
regarding the Distribution and the Registrant.  All of the information 
included in the following sections of the Information Statement is 
incorporated herein by reference:

     Questions and Answers About the Distribution and Related Matters
     Information Statement Summary
     Forward-Looking Statements
     Risk Factors--Risks Relating to IMS HEALTH and Nielsen Media Research and
      --Risks Relating to Nielsen Media Research
     The Distribution
     Relationship Between IMS HEALTH and Nielsen Media Research After the
      Distribution
     Dividend Policies--Nielsen Media Research
     Nielsen Media Research Capitalization
     Nielsen Media Research Selected Financial Data
     Nielsen Media Research Management's Discussion and Analysis of Financial
      Condition and Results of Operations
     Nielsen Media Research Business
     Nielsen Media Research Management and Executive Compensation
     Nielsen Media Research Security Ownership By Certain Beneficial Owners and
      Management
     Financial Statements--Nielsen Media Research, Inc. (Pages F-39 to F-59
       inclusive)

                                        3


ITEM 7.  Financial Statements; Pro Forma Financial Statements and Exhibits

(b)  Pro Forma Financial Information

     The information included in the section of the Information Statement 
entitled "Nielsen Media Research Unaudited Consolidated Pro Forma Financial 
Statements" is incorporated herein by reference.  Readers should note that 
notwithstanding the legal form of the Distribution described above, whereby 
the Registrant has "spun-off" IMS HEALTH, because of the relative 
significance of the IMS HEALTH business to the Registrant, IMS HEALTH is 
being treated as the "accounting successor" to the Registrant for financial 
reporting purposes. The pro forma financial statements incorporated by 
reference herein relate to the ongoing operations of the Registrant after the 
Distribution.

(c)  Exhibits



                                                              
Exhibit No.         Description                                         
- -----------         -----------
                 
23             Consent of Independent Accountants

27             Financial Data Schedule

99.1           Information Statement dated as of June 22, 1998

99.2           Form of Distribution Agreement between Cognizant Corporation and
               IMS Health Incorporated
 
99.3           Form of Tax Allocation Agreement between Cognizant Corporation
               and IMS Health Incorporated 

99.4           Form of Employee Benefits Agreement between Cognizant 
               Corporation and IMS Health Incorporated 

99.5           Form of Amended and Restated Transition Services Agreement among
               Cognizant Corporation, IMS Health Incorporated, The Dun &
               Bradstreet Corporation, The New Dun & Bradstreet Corporation, 
               ACNielsen Corporation and Gartner Group, Inc.




                                       4



SIGNATURES 

     Pursuant to the requirements of the Securities Exchange Act of 1934, as
amended, the registrant has duly caused this report to be signed on its behalf
by the undersigned hereunto duly authorized. 

                            NIELSEN MEDIA RESEARCH, INC.

                            By: /s/ Stephen J. Boatti 
                               ------------------------------
                               Title: Senior Vice President, 
                                      Chief Legal Officer and 
                                      Secretary
  

Date:  July 20, 1998


                                        5
 

                                    EXHIBIT INDEX

                                                              


Exhibit No.         Description                                         
- -----------         -----------
            
23             Consent of Independent Accountants

27             Financial Data Schedule

99.1           Information Statement dated as of June 22, 1998

99.2           Form of Distribution Agreement between Cognizant Corporation and
               IMS Health Incorporated
 
99.3           Form of Tax Allocation Agreement between Cognizant Corporation
               and IMS Health Incorporated 

99.4           Form of Employee Benefits Agreement between Cognizant 
               Corporation and IMS Health Incorporated 

99.5           Form of Amended and Restated Transition Services Agreement among
               Cognizant Corporation, IMS Health Incorporated, The Dun &
               Bradstreet Corporation, The New Dun & Bradstreet Corporation, 
               ACNielsen Corporation and Gartner Group, Inc.