SIEBEL SYSTEMS INC
AMENDED 2005 EXECUTIVE BONUS PLAN
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<TYPE>EX-10.6
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<DESCRIPTION>AMENDED 2005 EXECUTIVE BONUS PLAN
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<TITLE>Q2 2005 Exhibit 10.6</TITLE>
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<B><P ALIGN="CENTER">Siebel <FONT FACE="Times New Roman Bold">Systems, Inc. Amended 2005 Executive
Bonus Plan</P>
</FONT><P>Purpose:</P>

</B><P ALIGN="JUSTIFY">The terms of the Amended 2005 Executive Bonus Plan (the &quot;Plan&quot;) have been
established to reward the Company's executives and other senior management for assisting the Company in achieving
its operational goals through exemplary performance.  As further described below, under the Plan, the overall bonus
pool for cash bonuses, if any, will be funded based on the achievement of a specified corporate goal, and the awarding
of individual cash bonuses, if any, will be made based on a review of individual performance, which is determined at the
discretion of the Compensation Committee.</P>

<B><P>Determination of 2005 Cash Bonuses:</P>

</B><P ALIGN="JUSTIFY">The overall bonus pool for potential cash bonuses under the Plan (the &quot;Bonus
Pool&quot;) is based on the Company's targeted 2005 non-GAAP operating income as approved by the Compensation
Committee (the &quot;Target Operating Income&quot;).  The Bonus Pool will range from 33% to a maximum of 150% of
the target bonus pool as approved by the Compensation Committee depending on the extent to which the Company's
actual 2005 non-GAAP operating income meets, exceeds or falls short of the Target Operating Income.  </P>

<P ALIGN="JUSTIFY">The individual target bonus levels for participants in the Plan will be set forth as a percentage of
base salary.  The actual bonuses payable to participants will be paid out of the Bonus Pool based on the evaluation of
performance objectives which reflect, among other things, the participant's contribution to Company and business unit
performance, as appropriate, demonstration of the Company's core values and exceptional leadership, or on other
criteria to be determined by management and approved by the Compensation Committee.  </P>

<P ALIGN="JUSTIFY">The Company's Board of Directors and Compensation Committee reserve the right to modify
these performance goals and objectives at any time or to grant bonuses to participants even if the performance goals
and objectives are not met.</P>

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