The inadequacy of existing data on illegal immigration to the United States is described. The attempts that have been made by various government agencies and individual researchers to measure the extent and employment impact of illegal immigrants are then reviewed.

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Research Methodology literature review Americas economics population Migrants demography methodology Research Design developing country Population Dynamics Developing Countries statistics measurement Developed Countries Illegal Migrants socioeconomic status United States Demographic Analysis North America social status health care manpower Health Manpower Socioeconomic Factors socioeconomics Western Hemisphere Article employment status migration international migration developed country data analysis Demographic Factors research Estimation Technics Emigration and Immigration Economic Factors Transients and Migrants social class Northern America Human Resources employment Labor Force