This excerpt taken from the CB 8-K filed Dec 11, 2006.
Section 2. Eligibility
Any Director of The Chubb Corporation (the Company) or any Director of a participating subsidiary of the Company who is also a Director of the Company, who is not an officer or employee of the Company or a subsidiary thereof is eligible to participate in the Plan. A subsidiary shall become a participating subsidiary upon adoption of this Plan by the Board of Directors and by obtaining the consent to such adoption from the Board of Directors of the Company.