within isolated environments / silos. Therefore, managing advertising campaigns across different verticals is still very complex. However, leveraging on the advances provided by Next Generation Networks, together with the design principles inherent to Service Oriented Architectures and capabilities offered by Service Delivery Platforms, this scenario is about to change. Based on key conceptual entities called enablers, this work aims to change the current scenario. More concretely, this book introduces three distinct but complementary enablers. The Human Enabler provides a real-time context brokerage system capable of securely managing different types of user-related data in a standardized way. The Reasoning Enabler is the result of a welldefined methodology that enables new knowledge to be reasoned, based on previously stored data, by aggregating, correlating and inferring new information about people and their contexts. Lastly, the Session Management Enabler is responsible for abstracting the communication layers. It provides a context-aware multimedia delivery system capable of personalizing and adapting multimedia content according to a set of user and system pre-defined context data or rules, respectively. Altogether, they form the Converged User-Centric Advertising System and introduce new features that address the needs of both users and advertisers.