2006. 1. 2 Dugki Min Konkuk University Web Services Quality Model 2006. 1. 2 Dugki Min Konkuk University

Related WS Specifications Future Work 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 Quality Model : 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

Quality in Service-Level WS Quality Quality in Service-Level In Use In Management

Search, Negotiation, Contract, Implementation, Test, Deployment,… WSQM Quality Model Search, Negotiation, Contract, Implementation, Test, Deployment,… Quality Factors (Attributes) Quality Associates Quality Activity Business Value Quality Service Level Measurement Quality Interoperability Quality Business Processing Quality Manageability Quality Security Quality Development Quality contract Management Quality contract Appropriation Quality contract Service Stakeholder Service Developer Service Provider Service Administrator (or operator) Consumer QoS Manager QoS Broker (Assuror) We composed WSQM with 3 components: QF, QA, and QA. QF represents the evaluating items for WSQ. Quality associates are the person or the organization related all the WS activities. Quality Activities represent the major operations for guaranteeing a level of WS between associates. The main activities are maybe contracting, monitoring, control, etc. Most of QF are provided as a form of independent specification. We will view and arrange these factors in the respect of qualities and focus the activities before normal execution or operating time. There could be many activities for preserving a level of WSQ such as Search, Negotiation, Contract, Implementation, Test, Deployment. We will specify these activities in the respect of relationship of associates and QFs.

Development Quality Contract Quality Activity of WS 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 Development Quality Contract Service Developer Service Development Service stakeholder Service Operation & Management Service Provider Service Broker Service Quality Contract Management Quality Contract For example, let’s think about two quality activity. Service Consumer Quality Manager Service user

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 We referred 2 main model. SLA provides management framework, In that management level is differentiated by service level contracted by service provider and consumer. WSMF provides well organized management framework: WSM, Foundation, Events. WS-Manageability specifies well the manageability of metamodel in type of topic: Relationship, Identification, State, configuration, Metrics. WSDM, approved as OASIS standard, provides two spec: MUWS and MOWS. MUWS is for managing any resources with WS. So, it focus on the manageability and composability. The composability means that how easily WS management capability can be combined with resources. MOWS specify relationship model between manageability WS endpoint and manageable WS enpoint.

Future Work Subject to WSQM TC