Configuration Management (CM), in general, provides the operator with the ability to assure correct and effective operation of the 3G network as it evolves. CM actions have the objective to control and monitor the actual configuration on the Network Elements (NEs) and Network Resources (NRs), and they may be initiated by the operator or by functions in the Operations Systems (OSs) or NEs. CM actions may be requested as part of an implementation programme (e.g. additions and deletions), as part of an optimisation programme (e.g. modifications), and to maintain the overall Quality of Service (QOS). The CM actions are initiated either as a single action on a NE of the 3G network or as part of a complex procedure involving actions on many NEs. Clauses 4 to 6 give an introduction and description of the main concepts of CM, which are not mandatory for compliance with this specification in Release 99. Clause 7 contains the specific definitions for the standardised interface Itf N, which are necessary to follow for compliance. Clause 4 provides a brief background of CM while Clause 5 explains CM services available to the operator. Clause 6 breaks these services down into individual CM functions, which support the defined services. Clause 7 defines the Itf N (see 3G TS 32.102) to be used for 3G CM.