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 programmes and what procedures and mechanisms they use to conduct those evaluations.This book provides a range of recommendations for improving the design and implementation of evidence-based and accountable policies in the field of migration and asylum. Edited by Solon Ardittis and Frank Laczko, with contributions from Brunson McKinley, Antonio Vitorino, Joanne van Selm, Richard Lewis, Amir Naqvi, Holger Bonin, Rowan Roberts, and Klaus F. Zimmermann.