92 must vote for approval in the number of not less than twenty per cent of the total number of members of all such political parties combined, and Senators comprising not less than one-third of the total number of existing members of the Senate must vote for approval; (7) after resolution of approval has been passed under (6), there shall be an interval of fifteen days after which the draft Constitution Amendment shall be presented to the King, and the provisions of section 81 shall apply mutatis mutandis; (8) in the case where the draft Constitution Amendment is an amendment to Chapter I General Provisions, Chapter II The King or Chapter XV Amendment to the Constitution, or a matter relating to qualifications and prohibitions of persons holding the positions under the Constitution, or a matter relating to duties or powers of the Court or an Independent Organ, or a matter which renders the Court or an Independent Organ unable to act in accordance with its duties or powers, before proceeding in accordance with (7), a referendum shall be held in accordance with the law on referendum, and if the referendum result is to approve the draft Constitution Amendment, further proceedings shall then be taken in accordance with (7); (9) before the Prime Minister reports to the King for signature pursuant to (7), Members of the House of Representatives, Senators or members of both Houses comprising not less than one-tenth of the total number of existing members of each House or of both Houses, as the case may be, have the right to sign a joint petition submitting their opinions to the President of the House in which they are members or the President of the National Assembly, as the case may be, that the draft Constitution Amendment under (7) is contrary to section 255 or is of the characteristic under (8). The President of the House who receives such petition shall submit the opinions to the Constitutional Court. The Constitutional Court shall render a decision within thirty days from the date the petition is received. While the petition is under consideration for decision by the Constitutional Court, the Prime Minister may not present such a draft Constitution Amendment to the King for signature. CHAPTER XVI NATIONAL REFORM Section 257. National reform under this Chapter must be carried out to achieve the following objectives: (1) the nation enjoys peace and order, unity and solidarity, sustainable development in accordance with the philosophy of sufficiency economy, and a balance between material and spiritual development; (2) the society is peaceful and fair, and provides comparable opportunities to eliminate disparity;