The seven papers in this volume deal with problems concerning data and measurement, methods of constructing life tables, population projections, analyses of migration patterns and age profiles, aggregation procedures, and the evolutionary dynamics of populations of an international group of scholars studying national problems of human settlement at the International Institute for Applied Systems Analysis (IIASA). The papers included are: The one-year/five-year migration problem, P. Kitsul and D. Philipov; Constructing multiregional life tables using place-of-birth-specific migration data, J. Ledent; Multistate population projections, D. Philipov and A. Rogers; Entropy, multiproportional, and quadratic techniques for inferring patterns of ...