About the Santa Fe Institute -- Santa Fe Institute Studies in the Sciences of Complexity -- Introduction: Prehistoric Societies as Evolving Complex Systems -- Demography, Environment, and Subsistence Stress -- Notes on Economic Uncertainty and Human Behavior in the Prehistoric North American Southwest -- Hunting, Gathering, and Health in the Prehistoric Southwest -- Technological Strategies Responsive to Subsistence Stress -- Risk, Anthropogenic Environments, and Western Anasazi Subsistence -- The Calculus of Self-interest in the Development of Cooperation: Sociopolitical Development and Risk Among the Northern Anasazi -- Risk, Reciprocity, and the Operation of Social Networks -- Variability in Food Production, Strategies of Storage and Sharing, and the Pithouse-to-Pueblo Transition in the Northern Southwest -- Models and Frameworks for Archaeological Analysis of Resource Stress in the American Southwest.