for prevention of disability, rehabilitation and the realization of the goals of ‘full participation’ of [persons with disabilities] in social life and development, and of ‘equality’”; 7 (b) the Guidelines for the Establishment and Development of National Coordinating Committees on Disability or Similar Bodies, adopted in 1990; 8 (c) the Principles for the Protection of Persons with Mental Illness and for the Improvement of Mental Health Care, adopted in 1991; 9 (d) the Standard Rules on the Equalization of Opportunities for Persons with Disabilities (hereinafter referred to as the “Standard Rules”), adopted in 1993, the purpose of which is to ensure that all persons with disabilities “may exercise the same rights and obligations as others”. 10 The Standard Rules are of major importance and constitute a particularly valuable reference guide in identifying more precisely the relevant obligations of States parties under the Covenant. 1. General obligations of States parties 8. The United Nations has estimated that there are more than 500 million persons with disabilities in the world today. Of that number, 80 per cent live in rural areas in developing countries. Seventy per cent of the total are estimated to have either limited or no access to the services they need. The challenge of improving the situation of persons with disabilities is thus of direct relevance to every State party to the Covenant. While the means chosen to promote the full realization of the economic, social and cultural rights of this group will inevitably differ significantly from one country to another, there is no country in which a major policy and programme effort is not required. 11 9. The obligation of States parties to the Covenant to promote progressive realization of the relevant rights to the maximum of their available resources clearly requires Governments to do much more than merely abstain from taking measures which might have a negative impact on persons with disabilities. The obligation in the case of such a vulnerable and disadvantaged group is to take positive action to reduce structural disadvantages and to give appropriate preferential treatment to people with disabilities in order to achieve the objectives of full participation and equality within society for all persons with disabilities. This almost invariably means that additional resources will need to be made available for this purpose and that a wide range of specially tailored measures will be required. 7 World Programme of Action concerning Disabled Persons (see note 3 above), paragraph 1. 8 A/C.3/46/4, annex I. Also contained in the Report on the International Meeting on the Roles and Functions of National Coordinating Committees on Disability in Developing Countries, Beijing, 5-11 November 1990 (CSDHA/DDP/NDC/4). See also Economic and Social Council resolution 1991/8 and General Assembly resolution 46/96 of 16 December 1991. 9 General Assembly resolution 46/119 of 17 December 1991, annex. 10 Standard Rules (see note 6 above), Introduction, paragraph 15. 11 See A/47/415, passim.