The main objective of the INTER-TRUST project is to develop a framework to support trustworthy applications in heterogeneous networks and devices based on the enforcement of interoperable and changing security policies.This framework will allow developers, integrators and operators of systems to act during the development and operation phases to obtain systems with components that communicate and share data in a secure trusted manner dictated by negotiated security policies that we also refer to as dynamic security Service Level Agreements.The result will incorporate trustworthiness by integrating legal, social and economic concerns, allowing applications and devices to negotiate and be constrained by them. It will offer scalable and economically viable security and privacy policy management and enforcement solution that will assure secure interoperability to applications and devices in heterogeneous environments (objective 1.4a of the work programme).High level researchers and developers from academia and security software companies will bring the know-how and innovation to solve complex issues guaranteeing that the dynamic solution is applicable and does not introduce any vulnerability. Advanced enabling technologies will be integrated including: formal based monitoring and testing to detect malicious behaviour; negotiation, delegation, dynamic protection and prevention mechanisms based on Aspect Oriented weaving techniques; and, enhanced protection techniques to avoid introducing new vulnerabilities.INTER-TRUST intends to validate the results using two different case studies with complex, highly demanding critical services. The two case studies, E-voting and Vehicle-to-Vehicle and Vehicle-to-Infrastructure Communications for Intelligent Transport Systems, involve key European players and will perfectly illustrate the importance and cross-domain applicability of the INTER-TRUST's results and offer unique opportunities for their wide-spread exploitation