In Manila, 50,427 families, or approximately 12 percent of the population, live under conditions which, measured by the living standards of Europe and North America, would be deemed at best to be sub-standard and at worst, to be inhuman. Nor are these conditions limited to Manila. They are in fact, typical of most metropolitan areas of the developing countries of the world. It is estimated that in developing countries, from 10 to 40 percent of the people are living under conditions that the United Nations describes as--"a building, group of buildings, or area characterized by over-crowding, deteriorations, unsanitary conditions or absence of facilities or amenities which, because of these conditions or any of them endanger the health, safety or morals of its inhabitants or the community."