Abstract: Organizations are created and developed by people.It is also people, both managers and line workers as well as other stakeholders, who affect an organization's environment and performance.Probably for this reason people are a subject of management since the early stages of scientific management development.Mary Parker Follett was among the pioneers of this approach .She indicated the role of people in effective management, emphasizing workplace democracy and participation (Berman, Van Buren, 2015).The principle of "spirit harmony" in the organizational context has been formulated by Karol Adamiecki a hundred years ago.He believed that following this principle can increase the role of managerial science and enable man to find a source of the highest riches (both material and moral) at work (Adamiecki, 1924, p. 595).In the late 1920s and early 1930s, Elton Mayo conducted in Hawthorn research that laid the foundations for the human relations movement.This concept significantly contributed to the development of management science as well as other fields (e.g., organizational psychology).Mayo's study unveiled the importance