Web Services Quality Model Dugki Min Konkuk University

Contents Background Motivation Definition of Terms WSQM Quality Activity of WS Quality Associates of WS Quality Factors of WS Related WS Specifications Future Work

Background Web Services become popular infrastructure for service-oriented integration Business Web Services Grid Web Services Mobile Web Services Ubiquitous Web Services Web Services are valuable only if whose service qualities are satisfied by the consumers and guaranteed continuously.

Motivation Everybody uses the term, WS Quality, and says it is important. WSDM UDDI Service Contract But, there is no clear-cut definition of what WS Quality is. We need to have Common Model of WS Quality => Web Service Quality Model Common Language to describe WS Quality => Web Service Quality Description Language

Definition of Terms Quality : The totality of features and characteristics of a product or a service that bear on its ability to satisfy stated or implied needs. (ISO/IEC 9000) Quality Model : The set of quality-related actors, activities, characteristics of a product or a service and the relationship between them which provide the basis for specifying quality requirements and evaluating quality

WS Quality Quality in Service-Level In Use In Management

Quality Associates Quality Factors (Attributes) Quality Activity Service Stakeholder Service Developer Service Provider Service Administrator (or operator) Consumer QoS Manager QoS Broker (Assuror) Service Stakeholder Service Developer Service Provider Service Administrator (or operator) Consumer QoS Manager QoS Broker (Assuror) Development Quality contract Management Quality contract Appropriation Quality contract Development Quality contract Management Quality contract Appropriation Quality contract Quality Model Business Value Quality Service Level Measurement Quality Interoperability Quality Business Processing Quality Manageability Quality Security Quality Business Value Quality Service Level Measurement Quality Interoperability Quality Business Processing Quality Manageability Quality Security Quality WSQM Search, Negotiation, Contract, Implementation, Test, Deployment,…

Service stakeholder Service Developer Development Quality Contract Service Provider Service Consumer Management Quality Contract Service Development Service Operation & Management Quality Manager Service Broker Service user Example of Quality Activity Development Quality Contract: between Stakeholder and Developer Delivery time, Interoperability, Usability, Security Management Quality Contract: between Provider and Quality Manager Manageability, Composability Service Quality Contract Quality Activity of WS

Quality Associates for WS Consumer & Provider Stakeholder Has a ownership of WS and requires WSQ to a developer Uses WSQM in Quality Inspection Procedure QoS Broker Registers WS with quality properties and connect consumer and provider Monitors whether registered WS keep a quality level Quality Assuror Guarantees WSQ by monitoring and controlling the quality level Focus on Legal Assurance 3rd Party Quality Manager(3PQM) Deputy manager of WS-provider Monitors and manages system to secure required quality level from outside Focus on Technical Management

Quality Associates for WS

Quality Factors (Attributes) of WS

Related WS Specifications SLA Contract Standards WSLA (IBM): Management by service level agreement WS Management Standards WSMF (HP): Layered Management Framework WS-Manageability(IBM): Manageability Metamodel in type of Topic WSDM 1.0 (OASIS): OASIS standard MUWS: Composability + Manageability MOWS: Manageability Other related: WS-Addressing: to find WS resources WS-Notification: to notify change in resource state

Future Work Subject to WSQM TC