This document discusses several sociological theories that are relevant to nursing, including systems theory, feminist theory, critical social theory, and chaos theory. It provides overview and key concepts for each theory. Systems theory views systems as open with inputs, throughputs, outputs and feedback. Feminist theory analyzes gender differences and women's oppression. Critical social theory aims to uncover oppression and empower individuals. Chaos theory examines nonlinear dynamical systems and concepts like sensitive dependence on initial conditions and strange attractors. These theories are applicable to different aspects of nursing practice, research, administration and understanding health behaviors.