Business Intelligence (BI) aims to support business users to make decisions by providing methods and tools to easily access and manage their information. Even if many organizations have employed BI applications, not all of them have been successful. Therefore, it is important to ensure that they fit business and users' needs in terms of information, knowledge and decision. In this paper, a proposal to apply BI for BI is elaborated. Analysing a BI system based on BI techniques is our main contribution and it is the core of our proposal. While involving users, our proposal aims to identify BI indicators and dimensions and to propose a system architecture allowing to analyse the current BI environment and make decisions about its use. A case study at STMicroelectronics has been conducted since it uses a BI system for making decisions.