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(a). This Convention shall be open for signature on behalf of all members of the Bank and Switzerland and shall be subject to ratification, acceptance or approval by the signatory States in accordance with their constitutional procedures.
(b). This Convention shall enter into force on the day when not less than five instruments of ratification, acceptance or approval shall have been deposited on behalf of signatory States in Category One, and not less than fifteen such instruments shall have been deposited on behalf of signatory States in Category Two; provided that total subscriptions of these States amount to not less than one-third of the authorized capital of the Agency as prescribed in Article 5.
(c). For each State which deposits its instrument of ratification, acceptance or approval after this Convention shall have entered into force, this Convention shall enter into force on the date of such deposit.
(d). If this Convention shall not have entered into force within two years after its opening for signature, the President of the Bank shall convene a conference of interested countries to determine the future course of action.