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3. The means of ascertaining such qualifications shall be determined by the competent authority. 4. The staff of the employment service shall be adequately trained for the performance of their duties. Article 10 The employment service and other public authorities where appropriate shall, in co-operation with employers' and workers' organizations and other interested bodies, take all possible measures to encourage full use of employment service facilities by employers and workers on a voluntary basis. Article, 11 The competent authorities shall take the necessary measures to secure effective co-operation between the public employment service and private employment agencies not conducted with a view to profit. Article 12 1. In the case of a member the territory of which includes large areas where, by reason of the sparseness of the population or the stage of development of the area, the competent authority considers it impracticable to enforce the provisions of this Convention, the authority may exempt such areas from the application of this Convention either generally or with such exceptions in respect of particular undertakings or occupations as it thinks fit. 2. Each member shall indicate in its first annual report upon the application of this Convention submitted under Article 22 of the Constitution of the International Labour Organization any areas in respect of which it proposes' to have recourse to the provisions of the present Article and shall give the reasons for which it proposes to have recourse thereto ; no member shall, after the date of its first annual report, have recourse to the provisions of the present article except in respect of areas so indicated. 3. Each member having recourse to the provisions of the present Article shall indicate in subsequent annual reports any areas in respect of which it renounces the right to have recourse to the provisions of the present Article. Article 13 1. In respect of the territories referred to in Article 35 of the Constitution of the International Labour Organization as amended by the Constitution of the International Labour Organization Instrument of Amendment, 1946, other than the territories referred to in paragraphs 4 and 5 of the said Article as so amended, each member of the Organization which ratifies this Convention shall communicate to the Director-General of the International Labour Office as soon as possible after ratification a declaration stating—(a) The territories in respect of which it undertakes that the provisions of the Convention shall be applied without modification; (b) The territories in respect of which it undertakes that the provisions of the Convention shall be applied subject to modifications, together with details of the said modifications ; (c) The territories in respect of which the Convention is inapplicable and in such cases the grounds on which it is inapplicable ; (d) The territories in respect of which it reserves its decision.

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