The pueblos jovenes or 'young towns' of Lima, capital of Peru, are one of the most spectacular phemena of Latin American urbanization. They were originally formed when poor migrants from the sierra invaded vacant land within the city, initially erecting matting shelters; but latterly governments encouraged the upgrading of these settlements, through the self-help of their residents, and in consequence many older pueblos jovenes developed into poor working-class suburbs with solidly built houses. In this book, which was originally published in 1980 as part of the Urbanization in Developing Countries series, Professor Lloyd outlines the processes that led to the formation of the pueblos jovenes. First, the author shows that the settlement is a strongly cohesive community; and second that the term 'marginal', which is applied to both the settlement and its people, is in many senses inappropriate. He also critically examines government policies between the middle class and the poor.