Science versus humankind: the yin and yang of motivation theory

Motivation theory in the 20 th century has evolved to meet the changing social, political, and economic environment. The purpose of this paper is to examine the developmental path of modern motivation theory from the perspective of the Tao and the cyclical nature of Yin and Yang. We review motivation theory from the Industrial Revolution to the present. The developmental path during the past 100 years consists of seven distinct stages, each stage representing a significant shift in theory as well as a shift in the social, political, and economic environment in the United States. The dominant theme that emerges from the analysis is the discourse between science and humanity, and the revolving cycle of these fundamental theories throughout the century.