of performance and intelligence aspects are emphasized to indicate in this chapter, while contents regarding application and security are relatively general descriptions. Applications: Indeed, application aspect spans various minor items. When it comes to NGSDP-a telecom system, we pay more attention on business services and operations, telecom frameworks, software engineering, and other aspects. Performance and Intelligence: Cognitive NGSDP is discussed in accordance with the consideration of aspects of both performance and intelligence. Cognitive Science and Cognitive Networks are introduced to further describe cognitive functions. Design principles and feasible solutions long with relevant theories and technologies are mainly discussed then for Cognitive NGSDP. Security: Due to that both distributed telecom networks and software engi- neering should be considered for security, they are described in this section for NGSDP. Based on these introductions, we hope a whole clear impression on NGSDP, especially Cognitive NGSDP, can be made by our readers. Also, we hope our research on Cognitive NGSDP will contribute to further improvement in view of performance and intelligence for telecom operators and service providers. 6.2 Applications Regarding basic requirements of NGSDP, different research groups, telecom opera- tors and solution providers provide corresponding individual details. However, all Service Delivery Platforms these individual details can also represent the same vista of NGSDP. As indicated in paper [10], Atos Origin points out that a comprehensive and future-proof SDP supports all of the following: Off-the-shelf services. A broad catalogue of off-the-shelf services should be available that could be leveraged by the operator to cover most of its needs from the outset. For example, rich suite of services for both residential and enterprise segments contributing a new revenue stream, attracting new subscribers and increasing usage by existing subscribers. Next-Generation voice services (e.g., VoIP, Cent