The multiple land use philosophy in the area is to maintain the peaceful co-existence of human and wildlife in a natural and traditional setting. Pastoralism, conservation of natural resources and tourism are the three, main components that are given equal consideration in policy shaping decisions. The NCA aims for the historic balance of people and nature in a way which has not been possible in many parts of the world. At stake are the rich bio diversity and ecology of the Serengeti Plains and The Ngorongoro Highlands, the major palaeontological and archaeological sites and important water catchment areas. Tourism is a vital element in raising revenue and has been encouraged and developed with a respect for culture and without damaging the environment. Man and his ancestors have lived in the Ngorongoro eco-system for more than three million years. By careful research and continuing management, the fragile balance between man and nature will be successfully maintained.