Business process reengineering refers to a thorough rethinking and radical redesign of a business process in order to achieve dramatic and lasting improvements in quality, costs, services, delivery time and innovations. Although the idea of business process reengineering is easy to understand literally, its practical implementation is very difficult. One drawback is that BPR not only requires company money, but also consumes time and human resources. This aspect must be kept in mind when attempting to make a decision on which activity to continue. This paper describes the concept of business process reengineering as well as the business processes themselves. Business analyses that increase process efficiency and effectiveness are mentioned as well. The connection between information technology and reengineering is also described. Working together, BPR and IT have the potential to create a more flexible, team-oriented, coordinated work environment. IT is more than a set of tools for automation or process mechanization. It can fundamentally transform the way of doing business and enable process design. A part of the paper deals with reengineering methods and tools that ultimately aim to improve the efficiency of the company. They provide a systematic approach to managing and optimizing a company's business processes. At the end of this paper, examples of how large companies have made good use of all the capabilities of BPR are shown.