Seamless interworking between different MSs requires that the management information and the appropriate management services identified in the previous section are defined in a way that they can be accessed by peer MSs. Consequently, this section will focus on establishing an object model (a MIB) for MSs. In section 4.1, we show how we achieved a unified representation of management information common to all different kinds of entities involved in the management process. We then describe in section 4.2 how this management information can be refined w.r.t. the needs of specific MSs and how this process is eased by CASE tools.