The Evolutionary Sociology specialization examines theories and research on evolutionary processes, broadly conceived. Evolutionary thinking has existed since the founding of sociology and now permeates, often implicitly, much sociological analysis in diverse fields. The specialization examines long-term cycles and stages of societal and inter-societal development, the rise and demise of world-systems, neurosociology, evolutionary psychology, cross-species comparisons and analysis of human behavior and organization, the biological bases of human behavior, interaction, and social organization. and both sociocultural evolution and human biological evolution. The specialty is also developing cross-disciplinary collaborations with other social sciences as well as with the natural sciences.