The paper concerns Business Intelligence (BI) issue and the opportunities of using BI applications in organizations. BI enables to better understand not only the internal business processes, but also the competitive environment through the systematic acquisition, collation, analysis, interpretation and exploitation of information. It is considered that BI transforms the information into strategic knowledge. This allows for the identification of the opportunities and threats, which may occur on the market, while cooperating with customers, suppliers and competition. The main goal of this paper is to present the basic assumptions underlying the idea of BI and BI maturity as well as to identify the level of BI using in selected organizations. The structure of this paper is organized as follows. Firstly, an overview of subject literature on BI has been conducted. Then, the idea of BI maturity has been described. Different BI maturity models have been presented. Using an in-depth interview method, the results from the analysis of twenty organizations applying BI systems have been described. Gartner's Maturity Model for Business Intelligence and Performance Management was used to assess the level of BI in surveyed organizations.