This document provides an overview of different schools of management thought, beginning with the Classical perspective which emerged in the 19th-20th centuries. It discusses Scientific Management pioneered by Frederick Taylor which focused on operational efficiency. Henri Fayol contributed principles of administration including division of labor and unity of command. The Hawthorne Studies showed the importance of social factors in workplaces. Later, behavioral science looked at individual/group behaviors and needs hierarchies. Theories X and Y examined beliefs about employee motivation. Barnard viewed organizations as cooperative systems requiring effectiveness and efficiency to survive through communication and incentives.