There is general agreement today that traditional approaches to immigration admissions in the major receiving countries of the West have serious shortcomings either in concept or implementation, or at times in both. These essays, all written by leading immigration experts, consider the philosophical and moral constraints on immigration law and policy, the basic elements of a comprehensive migration policy, and specific policy areas, including family reunification and asylum. Taken together, these perspectives represent a fresh, comparative look at some of the most urgent issues in this pivotal area of law and policy.