Throughout its history as a social science, demography has been associated with an exclusively quantitative orientation for studying social problems. As a result, demographers tend to analyze population issues scientifically through sets of fixed social categories that are divorced from dynamic relationships and local contexts and processes. This volume questions these fixed categories in two ways. First, it examines the historical and political circumstances in which such categories had their provenance, and, second, it reassesses their uncritical applications over space and time in a diverse range of empirical case studies, encouraging throughout a constructive interdisciplinary dialogue involving anthropologists, demographers, historians, and sociologists.