"“Organization theory,” a term that appeared in the middle of the twentieth century, has multiple meanings. When it first emerged, the term expressed faith in scientific research as a way to gain understanding of human beings and their interactions. Although scientific research had been occurring for several centuries, the idea that scientific research might enhance understanding of human behavior was considerably newer and rather few people appreciated it. Simon was a leading proponent for the creation of “organization theory”, which he imagined as including scientific management, industrial engineering, industrial psychology, the psychology of small groups, human-resources management, and strategy. The term “organization theory” also indicated an aspiration to state generalized, abstract propositions about a category of social systems called “organizations,” which was a very new concept. Before and during the 1800s, people had regarded armies, schools, churches, government agencies, and social clubs as belonging to distinct categories, and they had no name for the union of these categories. During the 1920s, some people began to perceive that diverse kinds of medium-sized social systems might share enough similarities to form a single, unified category. They adopted the term “organization” for this unified category."