Article XIX Amendments (a) Amendments to the Convention may be proposed by any Party and shall be communicated to the Director General, who shall promptly circulate the proposals to all the Parties and Signatories. Three months notice is required before consideration of a proposed amendment by the Board of Signatories, which shall submit its views and recommendations to the Assembly of Parties within a period of six months from the date of circulation of the proposed amendment. The Assembly of Parties shall consider the proposed amendment not earlier than six months from receipt by it, taking into account any views and recommendations expressed by the Board of Signatories. This period may, in any particular case, be reduced by the Assembly of Parties by a decision taken in accordance with the procedure for a matter of substance. (b) If adopted by the Assembly of Parties, the amendment shall enter into force one hundred and twenty days after the Depositary has received notices of acceptance from two-thirds of those States which at the time of adoption by the Assembly of Parties were Parties and whose Signatories then held at least two-thirds of the total investment shares. Upon its entry into force, the amendment shall become binding upon all Parties and all Signatories. (c) An amendment shall not enter into force less than eight months after the date on which it was adopted by the Assembly of Parties. An amendment which has not entered into force under paragraph (b) of this Article eighteen months after the date on which it was adopted by the Assembly of Parties shall be deemed null and void.