Aim of this pilot project is to study, design and provide practical guidelines for the implementation of a QoS architecture of the GRNet backbone, in order to provide different Classes of Service (CoSs) to the customers of GRNet and utilization and management of GRNet's resources. The project will also study and propose a framework for the application, monitoring and management of these CoSs within the spectrum of GRNet and towards GRNet's customers. CTI/RU6 is a full partner in the project working mainly on the network architecture of the proposed QoS framework.