Companies can only gain competitive advantages through their ERP system if they have the ability to continuously adapt this system to new business conditions. ERP application management supports companies in this challenge and represents one of the central services that IT organizations provide today. Sonja Hecht is developing a maturity model that companies can use to assess and improve their capabilities in ERP application management. The model architecture and the methodology for determining maturity are based on the international standard ISO/IEC 15504. The organizational capabilities considered in the model are based on a comprehensive literature analysis as well as a qualitative-empirical study in ERP user companies.