Gilbreth was best known for her work as an industrial engineer and a pioneer in the field of management theory. Dubbed "America's first lady of engineering," she brought her training in psychology to time-and-motion studies and demonstrated how companies and industries could improve their management techniques, efficiency, and productivity. Gilbreth's extensive research and writings on her own and in collaboration with her husband emphasized "the human element in scientific management." Her expertise and major contribution to the field of scientific management was integrating the psychological and mental processes with the time-and-motion studies. She also helped make these types of studies widely accepted. In addition, Gilbreth was among the first to establish industrial engineering curricula in college and university engineering schools. Gilbreth's book, "The Psychology of Management" (1914), was an early major work in the history of engineering thought and the first to combine psychology with elements of management theory. Major repositories of Gilbreth materials are at the Archives Center of the Smithsonian National Museum of American History in Washington, D.C., and at Purdue University Library, Archives and Special Collections, at West Lafayette, Indiana.