| 1. | I                  have reviewed this quarterly report on Form 10-Q of Computer Sciences                  Corporation; |
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| 2. | Based                  on my knowledge, this quarterly 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 quarterly report; |
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| 3. | Based                  on my knowledge, the consolidated financial statements, and other                  financial information included in this quarterly 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                  quarterly report; |
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| 4. | The                  registrant's other certifying officers 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: |
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|   | 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 quarterly                  report is                  being prepared; |
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|   | 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; |
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|   | 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 |
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|   | d. | Disclosed                  in this report any change in the registrant's internal control                  over                  financial reporting that occurred during the registrant's first                  fiscal                  quarter that has materially affected, or is reasonably likely to                  materially affect, the registrant's internal control over financial                  reporting; and |
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| 5. | The                  registrant's other certifying officers 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): |
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|   | 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 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. |
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| Date:                  January 11, 2008 | By: |  /s/                  Michael W.                  Laphen                                                |
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|                                         |     |       Michael                  W. Laphen      Chief                  Executive Officer                                                                                                                                                                                                      |