1 / 31

Testing for Accessibility and Usability

Testing for Accessibility and Usability. Is Your Site Accessible and Usable or Just Conformant?. Presenters. Jason White – Co-Chair, Web Content Accessibility Guidelines Working Group Naomi Heagney – The Hiser Group Andrew Arch – Vision Australia Foundation.

cheryl
Download Presentation

Testing for Accessibility and Usability

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Testing for Accessibility and Usability Is Your Site Accessible and Usable or Just Conformant?

  2. Presenters • Jason White – Co-Chair, Web Content Accessibility Guidelines Working Group • Naomi Heagney – The Hiser Group • Andrew Arch – Vision Australia Foundation

  3. W3C and Accessibility Success Criteria Jason White

  4. WCAG 1.0 • Issues with conformance

  5. WCAG 2.0 • Testable success criteria • Abstraction and specificity • Definition of testability • Either machine testable or human testable • Introduction of review requirements into success criteria • E.g. text equivalent

  6. WCAG 2.0 continued • WCAG 2.0 is multi layered • Design principles • Guidelines and Checkpoints • Techniques for technologies • Test cases as part of techniques • Machine testable • Human testable • Non-testable

  7. A Usability Perspective Naomi Heagney

  8. Usability & Accessibility • What is Usability? • Similarities and differences • Focus • Resources • Method • Standards and legislation

  9. What is Usability? Usability is the extent to which a product can be used by specified users to achieve specified goals with effectiveness, efficiency and satisfaction in a specified context of use. – Definition from ISO 9241-11

  10. What is Usability? • User Centred Design (UCD) is an iterative and collaborative methodology: • Analysis • Design • Evaluation • Usability is not just “lab testing” • Reviews, walkthroughs, in-situ testing

  11. Similarities • The people • Involvement in development processes • Integrated • The earlier the better • Need knowledge of: • Target audience • Personal characteristics

  12. Differences • Focus • Conformance versus site improvement • Qualitative & quantitative data • Measures for usability are project-specific • Resources • Different specialist knowledge required

  13. Differences • Evaluation methods • Less emphasis on automated tools • Variety of techniques, scalable to project constraints • Standards & legislation • Focus on process rather than product • WCAG & checkpoints provide excellent basis for legislative support

  14. Accessibility Testing Andrew Arch

  15. Concept and Design Review • Critical consideration of end-to-end process • Identify: • Objective • Options for implementation • Assess strategies that could be used • Consider requirements on the user

  16. Manual Checking • Requires knowledge and understanding • Involves: • Reviewing content • Reviewing code • User testing

  17. Site Testing by Assistive Technology Users • Complements technical accessibility testing, but does not replace it. • Purpose is to appreciate usability issues for users of assistive technology. • User testing CANNOT determine if a site or online object works with all assistive technology. • User testers need to be skilled, but not expert with their technology.

  18. Technical Accessibility Checking • Automated Tools • All do a partial job • All have flaws or weaknesses • Interpretation needed (manual checking and rectification) • Many “pseudo tools” are available by using the options included as standard within your computer

  19. Browser settings Built-in checking Colour checkers Link checkers The Wave A-Prompt Tidy Code validators Commercial Tools Evaluation & Repair Tools Full list: http://www.w3.org/WAI/ER/existingtools.html

  20. Pseudo Tools – Browser Setting Options • Change the font to a larger size • View pages without images • View pages with styles sheets and pages colours/fonts disabled • View pages with an alternative, high contrast, colour scheme • Use the keyboard not the mouse to navigate • Disable scripts, applets and/or plugins • Try different browsers & versions

  21. Built in Checking – eg. Dreamweaver See also WAI Authoring Tools guidelines

  22. Colour Checkers • Colour Contrast • http://www.lighthouse.org/color_contrast.htm • http://aprompt.snow.utoronto.ca/ColorVisibilityProgram.html (Beta version) • Colour tester – colour blind • http://www.tesspub.com/colours.html • http://www.vischeck.com/ • Legible text • http://www.lighthouse.org/print_leg.htm

  23. Link Checkers • Link checkers: non-existent URLs • http://www.linkalarm.com/ • http://www.tetranetsoftware.com/solutions/linkbot/looking-for-linkbot.asp • http://www.cyberspyder.com/cslnkts1.html • http://validator.w3.org/checklink • Cannot check for incorrect addresses

  24. Pros Visual Shows reading order Shows logical structure Shows suspect ALT text Identifies scripts as a potential accessibility issue Cons No fixes No recommendations The Wave http://www.temple.edu/inst_disabilities/piat/wave/

  25. Pros Offers repairs Alt text registry Cons Slow to use Repairs code Interactive A-Prompt http://www.aprompt.ca/

  26. Pros Offers to fix code Formats HTML Works with HTML/XHTML/ Cleans up Word conversions Advice on accessibility & internationalisation Pros …cont GUI front-end available Interfaces with several authoring tools Cons Very technical Tidy http://www.w3.org/people/Raggett/tidy/

  27. Code Validators • HTML Validator • W3C: http://validator.w3.org/ • NetMechanic, WebDesignGroup • CSS Validator • http://jigsaw.w3.org/css-validator/ • SMIL Validator • http://www.cwi.nl/~media/symm/validator/

  28. Site Evaluation & Repair Tools(Commercial, but with free limited checks or trials) • Bobby (Watchfire) • http://bobby.watchfire.com/bobby/html/en/index.jsp • Lift Online(Usablenet) • http://www.usablenet.com/ • Ask Alice (SSB Technology) • http://askalice.ssbtechnologies.com:8080/askalice/index.html • Accverify (HiSoftware) • http://www.hisoftware.com/access/sitetest.htm

  29. Things to consider

  30. Management Considerations • How much will it cost? • What can “I” do? • Where do we need help? • What is the developers role? • What can I expect of “off the shelf” software? • What about outsourced sites?

  31. References • Evaluating Websites for Accessibilityhttp://www.w3.org/WAI/eval/Overview.html • The WAVEhttp://www.temple.edu/instituteondisabilities/piat/wave/ • Tidyhttp://tidy.sourceforge.net/ • A-Prompthttp://www.aprompt.ca/

More Related