4. An amendment shall enter into force on the thirtieth day following the date of deposit of the last instrument of ratification With the Secretary-General of ASEAN. ARTICLE 49 TERMS OF REFERENCE AND RULES OF PROCEDURE Unless otherwise provided for in this Charter, the ASEAN Coordinating Council shall determine the terms of reference and rules of procedure and shall ensure their consistency ARTICLE 50 REVIEW This Charter may be reviewed five years after its entry into force or as otherwise determined by the ASEAN Summit ARTICLE 51 INTERPRETATION OF THE CHARTER 1. pon the request of any Member State, the interpretation of the Charter shall be undertaken by the ASEAN Secretariat in accordance with the rules of procedure determined by the ASEAN Coordinating Council. 2. Any dispute arising from the interpretation of the Charter shall be settled in accordance with the relevant provisions in Chapter VII. Headings and titles used throughout the Charter shal only be for the purpose of reference.