he 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 the problem. This way the end customer does not have to wait for an operator and in most cases can get an issue fixed within a few minutes. Security from a customer perspective would be to ensure that the content is secure and reli- able and not misused in anyway by the service provider. 2. Service requirements: The main requirement in service space is to increase the number of services offered by the service provider. Killer application or the single application that can capture the market and build a customer base now mostly being a myth, the sure strategy to get customers is to increase the number of services. One of the adopted methods to achieve this with- out burden on capital expenditure is to mesh up existing services to create a new service. Diversity in the services that are offered is another service level requirement. Service management spans multiple areas like fraud man- agement, billing management, provisioning, service fulfillment, and SO 