In 2011, at the request of the U.S. Department of Homeland Security (DHS), the Committee on National Statistics at the National Research Council (NRC) appointed the Panel on Survey Options for Estimating the Flow of Unauthorized Crossings at the U.S.–Mexican Border to provide guidance on the use of surveys and other methodologies to estimate the number of unauthorized crossings at the U.S.–Mexico border. This report represents the final product of the panel.

The panel held its first in-person meeting (in conjunction with a public workshop) in November 2011. It held a second in-person meeting in January 2012. Several panel members participated in a field trip to the Tucson and San Diego sectors of the U.S.–Mexico border prior to the January meeting and had an opportunity to meet with U.S. Border Patrol (USBP) agents, observe the processing of apprehended migrants in the Tucson sector, tour the Nogales and the Chula Vista sections of the border fence, and see the remote sensing facility in the San Diego sector. These panel members were encouraged to ask questions about all aspects of border enforcement and received valuable information from USBP agents. The panel held its final in-person meeting in March 2012. In May 2012, several panel members traveled to Tijuana, Mexico, where they were hosted by researchers at El Colegio de la Frontera Norte (COLEF) and learned about data collection for the Survey of Migration at the Northern Border (EMIF-N).

This report would not have been possible without the contributions of many people. Special thanks go to the members of the panel, who dedicated time, thought, and energy to the report. The panel worked very well together and, due to its professional diversity, was well-positioned to address

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