1. The peoples concerned shall have the right to decide their own priorities for the process of development as it affects their lives, beliefs, institutions and spiritual wellbeing and the lands they occupy or otherwise use, and to exercise control, to the extent possible, over their own economic, social and cultural development. In addition, they shall participate in the formulation, implementation and evaluation of plans and programmes for national and regional development which may affect them directly. 2. The improvement of the conditions of life and work and levels of health and education of the peoples concerned, with their participation and co-operation, shall be a matter of priority in plans for the overall economic development of areas they inhabit. Special projects for development of the areas in question shall also be so designed as to promote such improvement. 3. Governments shall ensure that, whenever appropriate, studies are carried out, in cooperation with the peoples concerned, to assess the social, spiritual, cultural and environmental impact on them of planned development activities. The results of these studies shall be considered as fundamental criteria for the implementation of these activities. 4. Governments shall take measures, in co-operation with the peoples concerned, to protect and preserve the environment of the territories they inhabit. Article 8 1. In applying national laws and regulations to the peoples concerned, due regard shall be had to their customs or customary laws. 2. These peoples shall have the right to retain their own customs and institutions, where these are not incompatible with fundamental rights defined by the national legal system and with internationally recognised human rights. Procedures shall be established, whenever necessary, to resolve conflicts which may arise in the application of this principle. 3. The application of paragraphs 1 and 2 of this Article shall not prevent members of these peoples from exercising the rights granted to all citizens and from assuming the corresponding duties. Article 9 1. To the extent compatible with the national legal system and internationally recognised human rights, the methods customarily practised by the peoples concerned for dealing with offences committed by their members shall be respected. 2. The customs of these peoples in regard to penal matters shall be taken into consideration by the authorities and courts dealing with such cases. Article 10 1. In imposing penalties laid down by general law on members of these peoples account shall be taken of their economic, social and cultural characteristics.