In an effort to reduce distortions to freer mobility of low-skilled labor, the World Bank’s KNOMAD (Global Knowledge Partnership on Migration and Development) program has implemented this research project to collect migration cost data comparable across select migrant corridors to determine how much migrant workers pay to obtain foreign jobs and how migration costs vary across corridors. Results from this work will shed light on the amount and composition of worker-paid migration costs, identify cost items that can be reduced with appropriate policies and through cooperation among countries, and guide the global migration community in settling a global target to reduce migration costs.