This bachelor thesis is focused on a theme of informatics, which is the Competitive Intelligence. Its aim is to apply Competitive Intelligence in medium-sized enterprise. It is necessary to define Competitive Intelligence in order to make this application possible so that the reader understands what the term represents and where it applies. The main benefit would be to demonstrate how CI works in medium-sized enterprise. This thesis consists of 4 sections. The first one is focused on the general characteristics of Competitive Intelligence (hereinafter CI). The first part of this section is the definition of the term CI, and then it deals with its history, the reason for establishing CI and its division according to certain symptoms and perf...