Abstract
In the era of the mass production from 1945 to 1980, companies were directed to produce identical products, with hierarchical structures, all in a stable environment. In the present "era of information", companies must produce products with dynamic structures in a turbulent environment as the only constant is change. To make this environment more and more turbulent and changing, companies use strategic tools which make it possible to make an internal and external analysis of the company. On one hand, the external analysis includes the general analysis of the environment, the analysis of competition and also the analysis of the industry. On the other hand, the internal analysis includes the analysis of the resources, the analysis functions and the analysis of the performances.
