This European Telecommunication Standard (ETS) describes the requirements for the management of performance measurements and the collection of performance measurement data across a Public Land Mobile Network (PLMN). It defines the administration of measurement schedules, the generation of measurement results in the Network Elements (NEs) and the transfer of these results to the Operations System (OS). It also describes how the various requirements can be modelled as part of the generic PLMN information model. A set of measurements available for collection by NEs are described in annex B, effort has been made to ensure consistency in the definition of measurements between different NEs. The following is beyond the scope ETS, and therefore this ETS does not describe: - how the data, once accumulated and collected, could or should be processed, stored, or presented to an end user; - the information which may be obtained through the collection and processing of call or event related records which have been produced by the NEs primarily for the purpose of raising bills and other charges. The management requirements have been derived from existing telecommunications operations experience. The management definitions were then derived from other standardisation work so as to minimise the re-invention factor. References are given as appropriate. The objectives of this standardisation are: to normalise the description of each measurement; and to produce a common description of the management technique for result accumulation and transmission across a management interface. The normalisation is intended to result in comparability of measurement data produced in a multi-vendor PLMN. As far as possible, existing standardisation in the area of performanre management has been re-used and enhanced where particular requirements, peculiar to the mobile telephony environment, have been recognised. Field of application This ETS considers all aspects of performance management for a PLMN and its NEs defined in the GSM core Technical Specifications. However, only those aspects which are GSM specific and particular to PLMN operation are included in this ETS. Other performance measurement aspects of described NEs and performance measurement aspects of NEs not described by the GSM core Technical Specifications are included for information purposes in annex E or may be found in referenced documents.