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    Mirri5 Mirri5 Presentation Transcript

    • Metrics for accessibility on the Vamolà project Silvia Mirri Ludovico Antonio Muratori Paola Salomoni Marco Roccetti Department of Computer Science University of Bologna
    • Summary
      • Accessibility evaluation
      • The Italian law
      • The Vamolà Project
        • Validator
        • Monitor
      • Metrics for Accessibility
      • Future Works
      • Conclusion
    • Accessibility Evaluation
      • Automated Web accessibility evaluation tools (parsing HTML code)
        • Based on:
          • WCAG 1.0
          • Section 508
        • Online, offline
        • Freeware, shareware
      • Manual tests
      • Tests with users
    • The Stanca Act (2004)
      • 22 mandatory requirements (Web sites)
      • It restricts the WCAG 1.0 and the U.S. section 508
        • XHTML 1.0 Strict DTD
        • At least 0.5 em between a link and the following one
        • ...
      • It bounds every public institution
        • automatic check procedures
        • subjective, manual evaluation by accredited experts
    • The Vamolà Project
      • A collaboration between the University of Bologna and the Emilia Romagna Region
      • 2 applications:
        • An automatic validator
        • A monitor
      • Goals:
        • aiding public institution to survey their Web sites
          • getting together all the automatic procedures
          • providing guidelines to the subjective manual evaluations
        • pointing out a portrait of accessibility and its dynamics in time
    • The Validator
      • It is organized into 22 requisites to be satisfied (each single requirement could be chosen and then check)
      • It is implemented as a three-version application:
        • a Web‑centered application (based on Achecker )
        • a Web service
        • a module for the Apache Web server
    • The Validator
    • The Validator
    • The Monitor
      • Web-centered application:
        • Stores characteristics of evaluated Web sites (geographical location, administrative role, …)
        • Allows authorized users to choose:
          • Time period
          • Depth of the evaluation (only the home page, the whole Web site, a subset of Web pages, …)
          • Set of requirements
          • Subset of inserted Web sites to be evaluated
        • Is based on the validator results
        • Provides some in-time reports, Web sites improvements, etc
        • Shows its results on an SVG map and on a HTML table
    • The Monitor
    • The Monitor
    • Metrics for Accessibility
      • Several works in the accessibility field are related to the definition and the proposal of quantitative metrics for measuring accessibility
      • They are based on WCAG 1.0 checkpoints
      • They take into account
        • Automatic and semi-automatic checks (errors and warnings)
        • Different groups of people with disabilities
    • Our aims
      • Comparing the accessibility among Web sites
      • Evaluate Web sites an absolute scale
      • Evaluate Web sites dynamics in time and on the territory
      • Evaluate Web sites according to the users’ expectations and preferences
    • Our metrics
      • Counting errors of each class, assigning them a proper weight ( errors, warnings, … )
      • Clustering criteria
        • Checks
          • related to each of the 22 requirements
          • related to aspects which involved particular groups of users
        • Web sites
          • Institution domain (geographically or administratively)
          • Size (number of pages)
          • Services provided (as forms, multimedia object, etc)
      • Parameters of each metrics
    • Our metrics
      • Collaborative communities
        • different weight and some particular aspects could be considered as prior or secondary and hence defining different metrics
        • a sort of “majority report” could be synthesized as a set of parameters to build one or more customized metrics
    • Future work
      • A prototype of the monitor is being used to gauge all the parameters appearing on measures
      • Future work will deal with the developing phase and providing suitable, ad hoc guidelines, based on shortcomings clustering and measures values
      • Overridden enhancement and new metrics are also expected from a future community of developers on the monitor
    • Conclusion
      • At the present time Vamolà is an ongoing project:
        • We are designing and developing the prototype of the validator
        • We have implemented a prototype of the monitor and we are revising it in order to design the final application. This application open trends about accessibility metrics and measures
    • Contacts
      • Thank you for your attention!
      • For further information:
        • [email_address]