Volume 3 contains case studies of the El Cenizo and Sparks colonias. This report examines issues such as the history, environment, employment, income, poverty, work conditions, women in the workforce, and education of school children in these colonias and explores the applicability of several economic and state housing programs to meet their needs. It discusses three broad categories of economic programs that are potential sources of assistance to (1) general programs which focus on infrastructure problems, but not necessarily on colonia; (2) specific programs which focus on the economic development of the U.S.-Mexico border; and (3) colonia-based programs which are designed to stimulate economic development in colonias. The study also provides an in-depth analysis of the Economically Distressed Areas Program (EDAP), the types of energy sources available to colonias, and the subdivision and platting laws of Texas, New Mexico, Arizona, and California.