In behalf of the public programme ChileBarrio, for a study of 3 settlements in Rinconada de Maipú, to make a Plan of Improvement, the Instituto de la Vivienda (INVI) makes a physical- social cadastre, case to case of the houses, elaborating so many cards. It became necessary the implementation of a SIG to give a general concept of each settlement, with 3 different aims; the legal-institutional decisions of ChileBarrio, decisions of design of the office that will project the PMB, and as a substrate for INVI’s later investigations.