Abstract
The evolution of production techniques and the changes it implies about the nature of the work gives rise to ergonomics. Ergonomics for the purpose of adapting work to the worker.
Applied Psychology outcome of the work of Sigmund Freud emphasized the importance of psychological factors on productivity. Similarly, affect the productivity, physiological factors related to the physical environment and working conditions.
The crisis of 1929 is at the origin of a protest movement of classical thought and its rationalism.
The school of critical human relationships classical school because it neglects the human nature of work and the motivations and disincentives for employees. She studied the attitudes of men at work, their psychology and behavior of working groups. It therefore allows the human dimension of the company an essential place.
