erformance variables as discussed earlier is also an effective method for performance monitoring. Analyze performance: Analysis starts with formatting the performance records collected from the network elements to get useful data specific to the performance applications in the NMS. All information in the original per- formance records generated from the NE may not be of use in the NMS. The NMS application will be using specific fields in these records in its reports Fundamentals of EMS, NMS and OSS/BSS and processes. The main functionality of analysis is to identify trends in per- formance for planning, find degradation in quality to take corrective action, and generate reports of interest. Control network performance: The network performance control is also a part of performance management. Control mainly involves taking corrective action for issues identified during analysis and monitoring. The corrective action can be triggering action commands performed by a performance pro- cess on the NE or communication with other module like reconfiguration of the NE request to the resource configuration module. Report performance data: Customized performance reports as generated at the NMS. Customization can be at the user level or for user groups. For example, consider two user groups comprised of a service executive group and network operator group. The service executive would be interested in a graph showing the quality of service, while the network operator offering a resource for the same service would be interested in the throughput and utilization of resources. User specific customization is also required as different operators would have their own choice on the order and parameters in a performance report of the same data. The modules that interact with network performance management module are: Network trouble management: If the performance issue identified by the network performance management module requires fixing in the network resources, then the same is performed by interacting with network trouble managem