Maturity models are widespread used in several domains ranging from business processes to complete management frameworks like CMMI, ITIL or Cobit. In the paper on hand we develop a detailed maturity model for the management of segregation of duties in ERP systems. Our model includes several aspects starting with simple access rights management of individual systems and leading to comprehensive organizational aspects of multiple systems environments. Applying this model, organizations are enabled to improve compliance regarding access rights using a step by step approach. The approach described can also be used to assess existing segregation of duties processes of an organization in order to reveal further improvement opportunities.