Dugki Min

1
Web Services Quality Model

• 2005. 10. 12
• Dugki Min
• Konkuk University

2
Contents

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

3
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.

4
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
• gt Web Service Quality Model
• Common Language to describe WS Quality
• gt Web Service Quality Description Language

5
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

6
WS Quality

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

7
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)
8
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
ServiceDeveloper
ServiceDevelopment
Service stakeholder
Service Operation Management
ServiceProvider
Service Broker
Service Quality Contract
Management Quality Contract
ServiceConsumer
Quality Manager
Service user
9
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

10
Quality Associates for WS
11
Quality Factors (Attributes) of WS
12
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

13
Future Work

• Subject to WSQM TC