Answer:
The correct word for the blank space is: Elton Mayo.
Step-by-step explanation:
Australian sociologist and psychologist Elton Mayo (1880-1949) and his associates from Harvard University conducted a study in Chicago in the Western Electric Hawthorne Plant between the 1920s and 1930s. The purpose of the research was to prove that employees' behavior changed for the fact they were being observed rather than for changes in the environment. In the 1980s, the research was criticized because, according to other specialists, the methodology used was imprecise to suggest such reactions in individuals for the situation given in the Hawthorne Plant.