s also contributed in this space and came up with an extensive set of NGNM require- ments. The major ones that came out with an initial set of NGNM requirements in Fundamentals of EMS, NMS and OSS/BSS addition to ETSI TISPAN are ATIS and ITU-T. TMF has compiled these require- ments in TR133 document. Given below are some of the main categories in which NGNM requirements are defined. 1. Customer centric requirements: Customer needs and end-user experience is a key capability that drives current industry. This has led to specific require- ments centered on the customer. In a competing telecom market the best vendor is the one that can satisfy customer demands. So choice of service provider is a default requirement of NGNM. Personalization and mobility is one key customer requirement in next generation network management. Personalization would involve each customer getting the experience he/she wants, this way the service capabilities are customized to suit the needs of the specific user. Personalization is coupled with mobility to ensure that the NGN infrastructure has features for the personalized services to always fol- low the customer. Personalization and mobility are usually based on the user role. Another customer centric requirement is flexibility of service. Flexibility ensures service anytime and where, using any access mechanism chosen by the customer using the terminal device of choice. The customer should also be able to aggregate his services and understand the different billing models that are used. This means that the services are bundled and the billing model is simplified to improve customer experience. Two more high level require- ments would be self-care strategies and security. As part of NGNM most service providers are giving capabilities to the end customer to handle the issues that they usually encounter when using a service. This would include functionality like calling a hot line where a software program will try to understand the problem that a user is facing and give the user steps to fix