Presents a collective behavior model for examining the population turnaround (urban to rural migration) of the 1960s/1970s as a specific form of mass movement. Specifies the value-added process that produced this particular episode at this particular point in social history. Explores factors influencing decline in turnaround migration. (Author/MH)

International migration is presented as a permanent phenomenon. Historical changes in migration patterns are traced; and different types of immigration policies, and current and future trends are reviewed. Open and unrestricted immigration is a thing of the past, but selective, and illegal, immigration will continue. (SLD)

This paper focuses on partial models for solving urban problems to contrast our achievements as social scientists with our aspirations as prescribers of public policy. The objectives of this paper are (1) to review some of the reasons that an ideal set of solutions for urban problems has not been produced by social scientists and (2) to describe…