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					Toward a Contingent Approach to Evaluation of
  WWW Site Usability: A Comparative Study

 B325 Research Study and Assignment Tutorial

        Honours Research Project for Russell Dunstan
                     Murdoch University
    Division of Business, Information Technology and Law
Problem Review

     Design for Usable WWW Interfaces
         Lack of Usability processes in WWW Site development
         Experts and Amateurs share the same design space
     E-Commerce sites of growing importance – IBM,
      Internet start-ups
         Estimated 25% of all retail stock trades
         1.5 billion WWW sites in circulation
     Super-Webmaster Syndrome
         1 Person does everything!
Goals of this Research Study

    Research Goals:
        To compare a Contingent Approach to WWW Site
         Usability Evaluation to a Non-Contingent Approach
        Appropriate Usability Evaluation procedures for
         WWW Sites
             Definitions of usability based on characteristics of system
             User-Centred, Task-Based approach
             Adapted Interface principles from traditional systems
             WWW Design Style Guides (OHP)
        Implement the two approaches into a Software Tool
         for the Usability Evaluation of Heuristic Users – You.
        Providing scope to your B325 Studies!
WUCET (Contingent Approach)

   Chooses the most relevant set of criteria for a
    heuristic evaluation of particular websites
   Utilises a priority order for criteria, based on:
       Characteristics of the target user group (User-centred)
       WWW Site purpose (Task-based)
   Usability Dimensions
WUCET Usability Score

                                                Usability Ratings for Dim ensions



  Usability Rating


                     0.2                                                                                Series1

                            a   b   c   d   e    f     g    h     I    j     k      l   m   n   o   p


                                                     Usability Dim ensions
WAMMI (Non-Contingent Approach)

    Usability Evaluation on 5 factors
        Attractiveness, Control, Efficiency, Helpfulness, and
    20 questions in cut-down version (Original version
     at 60 questions and rising)
    Scores computed by WAMMI software
     (copyrighted) to produce average (median) values

                                    Source: (Jurek Kirakowski)
WAMMI Usability Score
Qualitative Responses

   Adding your personal view to the assessment
    of usability; and also to the software tool used
    to measure it.
          Free form comments on each tool
          Further development of the Software tool

   Provides support and adds weight to the
    assessment of usability for each web site using
    both of the tools.
     Comparison of Tools
                              WAMMI dimensions                 WUCET dimensions
   Comparing the             Attractiveness     ‘c’ Clarity/Presentation
    effectiveness of                             ‘g’ Attractiveness/Annoyance
    each tool against         Control            ‘b’ Hyperlinks
                                                 ‘e’ Navigation Support
    each other.
                              Efficiency         ‘a’ Content
   Derived WUCET                                ‘f’ Search Facilities
    scores: attained by                          ‘h’ Interaction Opportunities
                                                 ‘k’ Download Speed
    averaging scores                             ‘l’ HW and SW Requirements
    achieved by                                  ‘m’ Reliability
                                                 ‘o’ Ease of Downloads
    respondents for
                              Helpfulness        ‘i’ Error Reduction/Recovery
    those dimensions                             ‘j’ Help/Documentation
   Statistical t-tests for   Learnability       ‘d’ Adherence to Conventions/Standards
                                                 ‘n’ Customisability
                              OTHER              ‘p’ Integrity/Ethics
    difference between

   WWW Site usability of growing importance
       E-Commerce to engage most, if not all, potential customers
       Comparison between tools facilitating decision whether
        contingent approach more effective than a non-contingent
 WUCET contributing to field of WWW site automated
  usability evaluation tools
 Contribution to ever-growing list of WWW design
 Questions?

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