World population growth, especially its fertility component, poses a major dilemma for policymakers throughout the world. However, theoretical developments in demography have not yet provided a solid foundation for understanding contemporary population processes. From an anthropological perspective, the current micro-level models do not properly recognize the cultural and biological constraints within which people make reproductive decisions. On the macro level, demographic transition continues to be linked to processes of "modernization." Arguing that it is necessary to readdress micro-level issues in light of the cultural-historical variability of particular places and times and to explore linkages between macro- and micro-level phenomena through which population processes work themselves out, the contributors point the way to new theoretical formulations of the concept of culture, the nature of macro/micro linkages, and methods of placing demographic theory within the more encompassing framework of evolutionary theory.