Any communication or notice required or permitted to be given under the Plan shall be in such form as the Committee may determine from time to time, and if required in writing, shall be mailed by registered or certified mail or delivered in hand, if to the Company, to 870 Winter Street, Waltham, Massachusetts 02451, Attention: Senior Vice President, Human Resources (or such other address or addressee as the Committee may provide) and, if to the Participant, to such address as the Participant shall last have furnished to the Company.