This article presents information on enterprise resource planning (ERP). ERP systems are instruments for improving business processes such as manufacturing, purchasing or distribution. Therefore, ERP implementation should be closely connected. ERP implementation should involve the analysis of current business processes and the chance of reengineering, rather than designing an application system that makes only the best of bad processes. Due to the fact that business processes are very complex, in many cases analysis cannot be done directly on the real-world application. Thus, modeling aims at reducing the complexity of the reality in order to better understand business processes and their required software support. For this purpose, various aspects of business processes can be focused. In order to guarantee an integrated improvement of all relevant aspects modeling frameworks are needed. The architecture of integrated information systems (ARTS) provides three different applications that enable seamless business process improvement.