An important social issue currently confronting societies around the world is how to successfully accommodate the arrival of millions of migrants. The increasing immigration flow presents challenges for both members of the host societies and for the people that newly enter their countries. This issue focuses on the contribution of psychological theory and research to facilitating successful immigration and integration. Coverage includes both sides of the equation-the attitudes and values of members of the host society as well as the motivations and experiences of immigrants themselves-and includes contributions from investigators on four continents.