This European Telecommunication Standard (ETS) provides the conceptual and methodological framework for the definition of a standardized approach to the management of a PLMN. (This framework is elaborated in the remainder of the 12 series specifications) It introduces concepts developed for the management of telecommunications networks by other standards groups, discusses their use in the context of the management of a PLMN, defines a complete context for PLMN management information and identifies the developments of other management models which can be beneficially employed in the global and integrated management of a PLMN. This ETS also describes the methodology to be employed in the definition of the standardization activity and the scale of the results which are expected to be achieved. PLMN management is described in terms of the objectives for the Operator enterprise. Relationships exist between network management functionality and functionality required to support the enterprise model. While the definition of the enterprise model is outside of the scope of this series of ETSs, an understanding of the requirements is necessary so as to provide the underlying network management procedures.