The promesa project aimed to influence the physical and emotional health as well as the intellectual development of the children living on the Pacific coast of Chocó in 1976. Twenty years on describes the development of promesa and the way in which it has influenced the children, their families and the community. It also covers an extension to the inland areas of Chocó province and is an object lesson in how programmes must change to fit local circumstances. There were improvements at all levels: in health, nutrition, sanitation, general health, infant mortality, rates of malaria, housing, employment opportunities, income levels, community cooperation and activities. But the most striking changes were in the children and in the women who implemented the programme. (Próximamente publicado en español)