The document discusses the evolution of organizational theory from mechanistic to contemporary approaches. It describes Frederick Taylor's scientific management approach from the early 1900s which emphasized standardizing jobs and measuring worker efficiency. This led to bureaucratic organizations. The Hawthorne studies from the 1920s-1930s showed that social factors impact worker productivity more than was previously understood, shifting thinking to the human relations movement. More recent contingency theory argues there is no single best way to organize and the structure depends on external environmental factors. Mintzberg identified five parts of organizations and five common structures that vary based on the degree of specialization and standardization versus flexibility.