The terms of the elected members of the board shall be for not more than three years. An elected board member serves until the qualification of his or her successor, even if that requires that he or she serve for longer than three years. In the event of a vacancy, the board must hold an election within 120 days from the date of vacancy. In such a situation, the board must determine before the election whether the newly elected member will serve for a three-year term or for the remainder of the vacant term.
840 CMR, § 7.13