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Journal Article (Refereed)
January 2011

A Generic QoS Model for Web: Services Design

Rahman, W N W A & Meziane, F 2011, 'A Generic QoS Model for Web: Services Design', International Journal of Information Technology and Web Engineering, 6(3), pp.15-38.


  The development, registration, discovery, and invocation of quality Web services are vital for the successful implementation of applications using Web services. Considerable research focuses on quality for Web services. Unfortunately, current research on Quality of Service (QoS) for Web services is concentrated on service users and the implementation stage. This research highlights the importance of incorporating QoS at the design and development stages; the authors propose the introduction of QoS at the same time as functional requirements. However, Web Service Description Language (WSDL) describes the functional elements of a Web service, and QoS is significant for this description. Therefore, the authors propose an extension to the WSDL through a generic QoS metamodel, incorporating QoS specifications into the functionalities. This paper begins by defining the required QoS specifications for the development of quality Web services and explores the potential of the Unified Modeling Language as a technique and notation to specify QoS. To properly integrate QoS in the design, the authors propose extensions to the existing UML QoS profile. The paper concludes with the evaluation of the proposed framework and summarises its advantages.


 Quality of service (QoS) is an important attribute for web services. When using web services a developer should use and have access to the “best” available service. Current web services specifications fail to address this issue as quality is not part of the Web Service Description Language (WSDL). This paper proposes a lightweight extension to the WSDL through a generic QoS metamodel to incorporate QoS specifications. The second contribution of the paper is the proposed QoS metamodel that can be used by the developers to select the best web-service in terms of the attributes defined in the metamodel.


SEEK Members

External Authors

Wan Nurhayati Wan Ab. Rahman

Publication Details

Journal Name
International Journal of Information Technology and Web Engineering