GAT Matrix is the software solution for managing access authorizations within the GAT Management Solution, an organization software package for modern companies. In addition to the organization of access control authorizations, numerous other topics can be managed in the GAT Management Solution. The software solutions available for this can be used as stand-alone programs or as part of the overall package. As an administration solution for access management, the GAT Matrix software is reduced to the essentials and at the same time can be used in a uniquely flexible way. Since compatibility with existing devices is retained, investment security is guaranteed.