In 1878, a machinist at a Pennsylvania steelworks noticed that his crew was producing much less than he thought they could. With stopwatches and time-motion studies, Frederick Winslow Taylor ran experiments to find the optimal way to make the most steel with lower labor costs. It was the birth of a management theory, called scientific management or Taylorism.
Source: 4 Business Ideas That Changed the World: Scientific Management | Harvard Business Review