Exhibit
      31.1




I,
      Michael W. Laphen, certify that:




1.  I
      have reviewed this amended No. 1 to the annual report on Form 10-K/A of Computer
      Sciences Corporation;




2.  Based
      on my knowledge, this annual report does not contain any untrue statement of
      a
      material fact or omit to state a material fact necessary to make the statements
      made, in light of the circumstances under which such statements
      were made, not misleading with respect to the period covered by this annual report;




3.  Based
      on my knowledge, the consolidated financial statements, and other financial
      information included in this annual report, fairly present in all material
      respects the financial condition, results of operations and cash flows of the
      registrant as of, and for, the periods presented in this annual
      report;




4.  The
      registrant’s other certifying officer and I are responsible for establishing and
      maintaining disclosure controls and procedures (as defined in Exchange Act
      rules
      13a-15(e) and 15d-15(e)) and internal control over financial reporting (as
      defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and
      we
      have:




a)  Designed
      such disclosure controls and procedures, or caused such disclosure controls
      and
      procedures to be designed under our supervision, to ensure that material
      information relating to the registrant, including its consolidated subsidiaries,
      is made known to us by others within those entities, particularly during the
      period in
      which this annual report is being prepared;




b)  Designed
      such internal control over financial reporting, or caused such internal control
      over financial reporting to be designed under our supervision, to provide
      reasonable assurance regarding the reliability of financial reporting and the
      preparation of financial statements for external purposes in accordance with
      generally accepted accounting principles;




c)  Evaluated
      the effectiveness of the registrant’s disclosure controls and procedures and
      presented in this report our conclusions about the effectiveness of the
      disclosure controls and procedures, as of the end of the period
      covered by this report based on such evaluation; and




d)  Disclosed
      in this report any change in the registrant’s internal control over financial
      reporting that occurred during the registrant’s fourth fiscal quarter that has
      materially affected, or is reasonably likely to materially affect, the
      registrant’s internal control over financial reporting; and




5.  The
      registrant’s other certifying officer and I have disclosed, based on our most
      recent evaluation of internal control over financial reporting, to the
      registrant’s auditors and the audit committee of registrant’s board of directors
      (or persons performing the equivalent function):




a)  All
      significant deficiencies and material weaknesses in the design or operation
      of
      internal control over financial reporting which are reasonably likely to
      adversely affect the registrant’s ability to record, process, summarize
      and report financial information; and




b)  Any
      fraud, whether or not material, that involves management or other employees
      who
      have a significant role in the registrant’s internal controls over financial
      reporting.


Date:
                January 11, 2008
            
            By:
            /s/    MICHAEL
                W.
                LAPHENMichael
                W. Laphen
              Chief
                Executive Officer