consideration of the amendments by the States Parties. Such notice may be waived by the Member States. 3. Amendments to this Protocol shall be adopted by a decision of three quarters of all the State Parties and shall become effective thirty (30) days after such adoption. ARTICLE 27 SIGNATURE This Protocol shall be signed by the duly authorised representatives of the Member States. ARTICLE 28 RATIFICATION This Protocol shall be subject to ratification by the signatory States in accordance with their constitutional procedures. ARTICLE 29 ENTRY INTO FORCE This Protocol shall enter into force thirty (30) days after the deposit of instruments of ratification by at least two-thirds of all of the Member States. ARTICLE 30 ACCESSION This Protocol shall remain open for accession by any Member State. ARTICLE 31 WITHDRAWAL 1. Any State Party may withdraw from this Protocol upon the expiration of twelve (12) months from the date of giving written notice to the Executive Secretary to that effect. 2. Any State Party that has withdrawn pursuant to paragraph 1 of this Article shall cease to enjoy all rights and benefits under this Protocol upon the withdrawal becoming effective. 3. Any State Party that has withdrawn pursuant to paragraph 1 of this Article shall remain bound by the obligations under this Protocol for a period of twelve (12) months from the date of giving notice. 23