POWER OF ATTORNEY

(Section 16, Form ID, Form 144 Materials)





 The undersigned hereby constitutes and appoints GARY M. NELSON, DOUGLAS C. NEVE

and WILLIAM E. McDONALD, and each of them, to be the undersigned's true and lawful attorney-

in-fact from the date hereof to:



(1) execute for and on behalf of the undersigned any Form 144, Form ID, Form 3,

Form 4 or Form 5 or any amendments to such forms reporting any changes in the

undersigned's beneficial ownership of Ceridian Corporation's equity securities

reportable on such form; and



 (2) do and perform any and all acts for and on behalf of the undersigned which may

be necessary or desirable to complete or amend any such Form 144, Form ID,

Form 3, Form 4 or Form 5 and to effect the timely filing of such form with the

United States Securities and Exchange Commission and any other authority; and



 (3) take any other action of any type whatsoever in connection with the foregoing

which, in the opinion of such attorney-in-fact, may be of benefit to, in the best

interest of, or legally required of, the undersigned, it being understood that the

documents executed by such attorney-in-fact on behalf of the undersigned

pursuant to this Power of Attorney shall be in such form and shall contain such

terms and conditions as such attorney-in-fact may approve in his discretion.



 The undersigned hereby grants to each such attorney-in-fact full power and authority to

do and perform all and every act and thing whatsoever necessary and proper to be done in the

exercise of any of the rights and powers herein granted, with full power of substitution or

revocation, hereby ratifying and confirming all that such attorney-in-fact, or his substitute or

substitutes, shall lawfully do or cause to be done by virtue of this power of attorney and the rights

and powers herein granted.  The undersigned hereby revokes any and all powers of attorney

previously granted by the undersigned relating to the subject matter of this Power of Attorney.



      This Power of Attorney shall remain in full force and effect until the undersigned is no

longer required to file Forms 144, 4, and 5 with respect to the undersigned's holdings of and

transactions in securities issued by Ceridian Corporation, unless earlier revoked by the undersigned

in a signed writing delivered to the foregoing attorneys-in-fact.



 The undersigned has caused this Power of Attorney to be executed as of this ___day of

January, 2007.





      /s/ Michael F. Shea

      Michael F. Shea

F:\Legal\Legal-SEC\Officers & Directors\New Retiring Officer Director\New Section 16 Officer\Powers of Attorney.Section 16.Shea.doc