Business managers in companies are faced with a large amount of business data and information. This large amount of information will not give managers and employees the information that they need in developing further business and in the decision-making process. In the sea of data, some of the necessary information remain hidden, while they could contribute to the achievement of business goals and be useful in the decision-making process, in such a way that they turn into useful information for decision makers, which can be achieved by implementing Business Intelligence in business. Business Intelligence is, as it name states, a business intelligence service which helps the companies to manage a large amount of data and to obtain a smaller amount of necessary data which are converted into information, and subsequently knowledge which is needed to make strategically important decisions. In larger companies, Business Intelligence can be implemented as a separate business function or department, while in smaller companies it can be implemented as Business Intelligence application. In the research part of the doctoral dissertation, Business Intelligence has been implemented in three observed insurance companies for a period of three months as a Business Intelligence application. As a result of the research, the three set hypothesis have been confirmed; the employees are weighted with a large amount of business data that are not useful for their business and a model has been simulated for data management, conversion of information into knowledge and generation of knowledge– Business Intelligence application. After the research conducted in three observed insurance companies, the data on the efficiency of sales representatives before and after the implementation of Business Intelligence application have been compared and most of sales representatives achieved better business results during the implementation of Business Intelligence application. Business Intelligence leaves space for managers to make strategic decisions, in such a way that it classifies the data based on the given criteria and it creates background for making strategically important decisions. Thus, the companies gain strategic competitive advantage because managers have certain information at disposal which they would not have without the implementation of Business Intelligence. The advantages of implementation of Business Intelligence in companies are numerous. One of them is the increase of overall level of knowledge in a company, in such a way that the gathered data are selected according to the given criteria and are turned into useful information for managers and employees. The information subsequently serves as a background for generating the overall level of knowledge in the company. Business Intelligence is a kind of „radar“ in companies which anticipates future changes and the behaviour of the competition.