Article 22 1. Education programmes for the populations concerned shall be adapted, as regards methods and techniques, to the stage these populations have reached in the process of social, economic and cultural integration into the national community. 2. The formulation of such programmes shall normally be preceded by ethnological surveys. Article 23 1. Children belonging to the populations concerned shall be taught to read and write in their mother tongue or, where this is not practicable, in the language most commonly used by the group to which they belong. 2. Provision shall be made for a progressive transition from the mother tongue or the vernacular language to the national language or to one of the official languages of the country. 3. Appropriate measures shall, as far as possible, be taken to preserve the mother tongue or the vernacular language. Article 24 The imparting of general knowledge and skills that will help children to become integrated into the national community shall be an aim of primary education for the populations concerned. Article 25 Educational measures shall be taken among other sections of the national community and particularly among those that are in most direct contact with the populations concerned with the object of eliminating prejudices that they may harbour in respect of these populations. Article 26 1. Governments shall adopt measures, appropriate to the social and cultural characteristics of the populations concerned, to make known to them their rights and duties, especially in regard to labour and social welfare. 2. If necessary this shall be done by means of written translations and through the use of media of mass communication in the languages of these populations. PART VII. ADMINISTRATION Article 27 1. The governmental authority responsible for the matters covered in this Convention shall create or develop agencies to administer the programmes involved. 2. These programmes shall include-(a) planning, co-ordination and execution of appropriate measures for the social, economic and cultural development of the populations concerned; (b) proposing of legislative and other measures to the competent authorities; (c) supervision of the application of these measures. PART VIII. GENERAL PROVISIONS Article 28 The nature and the scope of the measures to be taken to give effect to this Convention shall be determined in a flexible manner, having regard to the conditions characteristic of each country. Article 29 The application of the provisions of this Convention shall not affect benefits conferred on the populations concerned in