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The first comprehensive theories of management appeared around 1920.

The Harvard Business School offered the first Master of Business Administration degree ( MBA ) in 1921.

People like Henri Fayol ( 1841 – 1925 ) and Alexander Church described the various branches of management and their inter-relationships.

In the early 20th century, people like Ordway Tead ( 1891 – 1973 ), Walter Scott and J. Mooney applied the principles of psychology to management, while other writers, such as Elton Mayo ( 1880 – 1949 ), Mary Parker Follett ( 1868 – 1933 ), Chester Barnard ( 1886 – 1961 ), Max Weber ( 1864 – 1920 ), Rensis Likert ( 1903 – 1981 ), and Chris Argyris ( 1923-) approached the phenomenon of management from a sociological perspective.