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Quality of Service: Concept Analysis. Jolanta Miliauskait ė Vilnius University Institute of Mathematics and Informatics. Content. Introduction What is the Quality? What means the Quality of Service? Conclusions. Introduction. quality-driven composition of semantic web services

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quality of service concept analysis

Quality of Service: Concept Analysis

Jolanta Miliauskaitė

Vilnius University

Institute of Mathematics and Informatics

content
Content
  • Introduction
  • What is the Quality?
  • What means the Quality of Service?
  • Conclusions

Baltic DB&IS 2012

introduction
Introduction
  • quality-driven composition of semantic web services
  • domain-independent characteristics of quality
  • highly dynamic environment
  • ontological model

Baltic DB&IS 2012

what is the quality
What is the Quality?
  • The five different meanings of the term quality:
      • Transcendental (ormetaphysical) view
      • Product-Based View
      • User-Based View
      • Manufacturing-Based View
      • Value-Based View

Baltic DB&IS 2012

what is the quality1
What is the Quality?
  • Transcendental (ormetaphysical) view
    • “innate excellence”
    • absolute and universally recognizable, a mark of uncompromising standards and high achievement
    • an ideal, towards which we should strive but which can never be achieved in objective reality
    • cannot be measured by experts and can be perceived through experience alone

Baltic DB&IS 2012

what is the quality2
What is the Quality?
  • Product-Based View
    • quantifiable and measurable characteristics or attributes
      • it examines the quality from inside perspective and assumes that a product which has good internal properties has also good external properties

Baltic DB&IS 2012

what is the quality3
What is the Quality?
  • Product-Based View
    • ISO-9004 standard
      • quality is defined as
        • fitness for use
        • performance
        • safety
        • dependability
      • quality of design

Baltic DB&IS 2012

what is the quality4
What is the Quality?
  • Product-Based View
  • The disadvantages of this approach
    • it do not take into account preferences of a particular user
    • it assumes that the absence or presence of an attribute implies higher quality

Baltic DB&IS 2012

what is the quality5
What is the Quality?
  • User-Based View
    • fitnessforpurpose
    • market-place quality or consumer preference
    • Idea - quality is an individual matter, and things that best satisfy user preferences have the highest quality
    • context-dependent

Baltic DB&IS 2012

what is the quality6
What is the Quality?
  • User-Based View
    • highly subjective
      • product characteristics as
        • usability
        • reliability
        • performance
        • efficiency
    • Product is of high quality if it satisfies a large number of users

Baltic DB&IS 2012

what is the quality7
What is the Quality?
  • User-Based View
    • how to sum up varying individual preferences of particular users
    • how to know which attributes are for quality and which for user satisfaction

Baltic DB&IS 2012

what is the quality8
What is the Quality?
  • User-Based View
    • difficult to develop
    • user’s satisfaction may change
    • large number of non-quality issues
    • function of the differences between customer’s expectation and performance along the quality dimensions

Baltic DB&IS 2012

what is the quality9
What is the Quality?
  • Manufacturing-Based View
    • conformance to requirements specification in which the requirements are stated mostly in technical terms
    • idea - any deviation from the specification decreases quality
    • objective and measurable terms
      • focuses on making error-free products or services
      • not on the absence or presence of some attributes

Baltic DB&IS 2012

what is the quality10
What is the Quality?
  • Manufacturing-Based View
    • quality of conformance
    • errors can be eliminated by
      • conformance to process standards
      • concentrates on engineering
      • manufacturing practices
    • It is supported by ISO 9001 standard and CMM.

Baltic DB&IS 2012

what is the quality11
What is the Quality?
  • Value-Based View
    • the degree of excellence at an acceptable price
    • it makes a trade-off between cost and quality
    • the Value-Based View (in the context of web services)
      • cost
      • functionality
      • time to deliver

Baltic DB&IS 2012

what is the quality12
What is the Quality?
  • Summary
    • The concept of quality has
      • multiple definitions
      • wide variety of phenomena
      • context dependent and time period dependent
    • unique ontological model

Baltic DB&IS 2012

what means the quality of service
What means the Quality of Service?
  • services and products share many similarities, they differ also in a number of ways
    • intangibility
    • heterogeneity
    • inseparability
    • Perishability
  • Conflicting opinions exist on these issues.

Baltic DB&IS 2012

what means the quality of service1
What means the Quality of Service?
  • SQuaRE model for software
  • Ability to provide specific users with specific service in defined context of use (user-based view of quality)
  • propose to consider also internal web service quality (manufacturing-based view of quality)
  • external web service quality (product-based view of quality)

Baltic DB&IS 2012

conclusions
Conclusions
  • ambiguous and difficult to define precisely
  • although observations are very significant and highlight some aspects of the nature of this concept, unfortunately,
    • they are still not enough to develop the ontological model of QoS
    • more deep analysis of QoS should be done for this aim

Baltic DB&IS 2012