The purpose of this research is to establish urban indicators that can support a diagnosis through the application of CDU (Scheme of Urban Inequalities) in the city of Medellin, Colombia, which has a population of about 1,850 inhabitants. Six (6) different quarters, representing all three (3) different social and economic levels, have been chosen in order to analyze and detect three (3) processes of legal and illegal ground occupation, their predominant use and their compatibility in urban accumulation with their associated production of habitationThe first process is characterized by an illegal ground occupation with production of non legal habitation and invasion. The second process, the legal ground occupation with housing developed by the formal market, is associated to the private and official sectors. The third and last process, which occurred during the 80’s, is characterized by illegal ground occupation and habitation production in steep areas of the city.