CORPORATE EXECUTIVE BOARD CO
EX-10.1 NON-COMPETITION AGREEMENT
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<TYPE>EX-10.1
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<DESCRIPTION>EX-10.1 NON-COMPETITION AGREEMENT
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<TITLE>Corporate Executive Board Exhibit 10.1</TITLE>
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<P align="right"><FONT size="2"><B>Exhibit&nbsp;10.1</B></FONT>


<P align="center"><FONT size="2"><B>THE CORPORATE EXECUTIVE BOARD COMPANY<BR>
2000 Pennsylvania Avenue, N.W.<BR>
Washington, D.C. 20006</B></FONT>


<P align="center"><FONT size="2"><B>October&nbsp;25, 2001</B></FONT>


<P><FONT size="2">David G. Bradley<BR>
c&#47;o The Advisory Board Company<BR>
600 New Hampshire Avenue, N.W.<BR>
Washington, D.C. 20037
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        <TD valign="top"><FONT size="2"><I>Re:</I></FONT></TD>
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<I>Non-Competition Agreement by and among The Corporate Executive Board Company, The Advisory Board
Company and David G. Bradley</I></FONT></TD>
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<P><FONT size="2">Dear David:
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<P><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Effective as of January&nbsp;1, 1999, The Corporate Executive Board Company (&#147;CEB&#148;), entered into a Non-Competition Agreement (the &#147;Agreement&#148;) with you and The Advisory Board Company (&#147;ABC&#148;). Section&nbsp;5 of the Agreement provides that the term of the Agreement shall end on the date that is five years after January&nbsp;1, 1999.
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<P><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This letter confirms that, in consideration of the benefits which you and CEB each draw from the Agreement, you and CEB have agreed:
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        <TD width="2%" align="left" nowrap><FONT size="2">&#149;</FONT></TD>
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        <TD width="94%"><FONT size="2">To amend Section&nbsp;5 of the Agreement to provide that the term of the Agreement, solely with respect to the rights and obligations as between you and CEB, shall end on January&nbsp;1, 2007.</FONT></TD>
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        <TD width="94%"><FONT size="2">To amend Section&nbsp;3 of the Agreement to provide that after January&nbsp;1, 2004, the Bradley Parties, but not ABC, may recruit or employ up to one person per year that would otherwise require the consent of CEB under Section&nbsp;3(a) of the Agreement.</FONT></TD>
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<P><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Nothing in this letter shall be deemed to amend, waive, void or extend the term of the Agreement with respect to ABC&#146;s rights or obligations under the Agreement.
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<P><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Please indicate your agreement with the foregoing by signing and returning one copy of this letter, which will constitute our agreement with respect to the subject matter hereof.
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Very truly yours,</FONT></TD>
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        <TD colspan="3" align="left" valign="top"><FONT size="2">THE CORPORATE EXECUTIVE BOARD COMPANY</FONT></TD>
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        <TD valign="top"><FONT size="2">By:<BR>
Name:<BR>
Title:</FONT></TD>
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&#47;s&#47; JAMES J. MCGONIGLE<BR>
</FONT><HR size="1" noshade><FONT size="2">
James J. McGonigle<BR>
Chairman and Chief Executive Officer</FONT></TD>
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<P><FONT size="2">ACCEPTED AND AGREED:</FONT>
<P><FONT size="2">&#47;s&#47; DAVID G. BRADLEY
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David G. Bradley
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