Quality related aspects relevant for service-based applications cover a broad field of research, including work on quality modeling, QoS and SLA negotiation, as well as constructive and analytical quality assurance (like testing, monitoring and static analysis). This deliverable provides a survey of this broad field of “service quality ” and identifies the key areas where research contributions are currently available. Based on this survey of the state of the art, important and emerging research challenges are identified that could be pursued in the future in order to close several of the gaps which emerge from the current state of the art on “service quality”. Copyright © 2008 by the S-Cube consortium – All rights reserved.