Existing data on illegal immigration in the U.S. is inadequate. The limited availability of macrodata on the size of the annual flows and of the accumulated stock of individuals as well as of microdata on their influence on selected labor markets has been used to forestall policy reform efforts. (Author/RDN)

Based on interviews conducted with undocumented workers in the El Paso-Juarez (Mexico) metropolitan area, describes living and working conditions of such workers and the migration routes that they follow. Also discusses social networks among undocumented Mexican workers and recounts some of the interviewees' experiences with the U.S. Border…