The article describes how to improve business processes by using modeling and simulation tools. A dynamic business environment requires continuous improvement of business processes. By using process improvement tools, the enterprise gains insight into ongoing processes, which is the basic requirement for a planned change. The simulation tools provide professionals with the opportunity to build variants of the future organization of processes that are expected to deliver higher business performance. Using modeling tools, it is possible to describe and create the current map of the monitored processes. By introducing a change in processes, the simulation tool enables the future development of the key performance indicators monitored. In the present paper, the authors present the use of a tool for modeling and simulation of processes, where they address the role of improving the business processes of the company dealing with the production of books, magazines, paper packaging and promotional materials.