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ARTICLE XXIV
5. Accordingly, the provisions of this Agreement shall not prevent, as between the territories of contracting parties, the formation of a customs union or of a free-trade area or the adoption of an interim agreement necessary for the formation of a customs union or of a free-trade area; Provided that:
(a) with respect to a customs union, or an interim agreement leading to the formation of a customs union, the duties and other regula- tions of commerce imposed at the institution of any such union or interim agreement in respect of trade with contracting parties not parties to such union or agreement shall not on the whole be higher or more restrictive than the general incidence of the duties and regulations of commerce applicable in the constituent terri- tories prior to the formation of such union or the adoption of such interim agreement, as the case may be;
(b) with respect to a free-trade area, or an interim agreement leading to the formation of a free-trade area, the duties and other regula- tions of commerce maintained in each of the constituent territories and applicable at the formation of such free-trade area or the adop- tion of such interim agreement to the trade of contracting parties not included in such area or not parties to such agreement shall not be higher or more restrictive than the corresponding duties and other regulations of commerce existing in the same constituent territories prior to the formation of the free-trade area, or interim agreement, as the case may be; and
(c) any interim agreement referred to in sub-paragraphs (a) and (b) shall include a plan and schedule for the formation of such a customs union or of such a free-trade area within a reasonable length of time.
6. If, in fulfilling the requirements of sub-paragraph 5 (a), a contracting party proposes to increase any rate of duty inconsistently with the pro- visions of Article II, the procedure set forth in Article XXVIII shall apply. In providing for compensatory adjustment, due account shall be taken of the compensation already afforded by the reductions brought about in the corresponding duty of the other constituents of the union.
7. (a) Any contracting party deciding to enter into a customs union. or free-trade area, or an interim agreement leading to the formation of such a union or area, shall promptly notify the CONTRACTING PARTIES and shall make available to them such information regarding the proposed union or area as will enable them to make such reports and recommenda- tions to contracting parties as they may deem appropriate.
(b) If, after having studied the plan and schedule included in an interim agreement referred to in paragraph 5 in consultation with the parties