Some distributed applications are unable to work correctly without imposing quality guarantees on services provided by the communication network and by the execution platforms. These applications require support for quality of service (QoS) to work correctly, implying that timing, realibility and security requirements must be enforced by the system. This paper presents a language for QoS specification called QSL (QoS Specification Language), which is able to express requirements for different application domains, to map requirements between different abstraction levels and to specify different quality levels. QSL is integrated with specification methods and tools, allowing that QoS requirements be taken into account during all phases of software development. This work also describes an execution support based on CORBA that is able to enforce QoS requiremets specified in QSL.
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