This document provides an overview of the evolution of management thought from the 1880s to the present. It describes the classical/scientific management school pioneered by Taylor, Fayol, and the Gilbreths which emphasized rationality and scientific principles. It then discusses the human relations movement led by Mayo, Follett, and McGregor which focused on micro-level needs, motivation, and leadership. Finally, it outlines systems theory and contingency theory, noting management must adapt to changing environments and circumstances.