This paper analyzes an ERP system implementation from a perspective of complex system and standardization. The examined IT structure can be characterized as a loosely coupled integration with the ERP system as a central integration facilitator. This solution allowed the company to make use of standardization benefits, filling the need of special functionality and at the same time limiting negative unexpected consequences such as decreased activity support and increased complexity. The paper shows how ERP´s can contribute to standardization and integration efforts in IT environments withpeculiar demands on functionality. It also demonstrates how negative side effects related to implementation of ERP systems can be managed and limited.