How are the Costs and Impacts of Migration Policies Evaluated? / Migration Policy Institute, April 2008
http://www.migrationinformation.org/Feature/display.cfm?id=677
Solon Ardittis, Eurasylum and Frank Laczko, International Organization for Migration
"The impact and costs of migration policy measures are often unknown, and performance indicators may be very rudimentary. Several studies, especially in the United States, have tried to measure the costs and benefits of immigration. However, there have been few cross-national attempts to assess how countries evaluate their migration policies and programs and what procedures and mechanisms they use to conduct those evaluations..."