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Universal Access to Technology

Universal Access to Technology. User-centered system Design is iterative!. DESIGN TEST. Case Study:. Computer Aided Conversation for Severely Physically Impaired Non-speaking People (Norman Alm et al.). Why I like this article. Solves a real problem Tells a clear story

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Universal Access to Technology

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  1. Universal Access to Technology

  2. User-centered system Design is iterative! DESIGN TEST

  3. Case Study: Computer Aided Conversation for Severely Physically Impaired Non-speaking People (Norman Alm et al.)

  4. Why I like this article • Solves a real problem • Tells a clear story • Did a terrific analysis of the task • Technical solution is informed by a theory of communication • Good evaluation at the end

  5. Conversation • Turn-taking • Adjacency pairs • Topic structure • Perspectives

  6. What the researchers did: • Task analysis • Had real user in mind • Simulation with index cards • Role playing • Iteration • Screen design • Evaluation • Healthy users • Non-speaking user

  7. Computer-assisted conversation A: I went to France last year, to Marseilles. B: I’ve never visited Marseilles, I’ve sort of driven round the outskirts, but never actually gone into Marseilles. A: Surprisingly, it’s really beautiful. B: Really? I just imagine it as sort of a port, and just like any other large city, with nothing particularly interesting. A: You expect a major port to be fairly grotty, don’t you ? B: [LAUGHl That’s right [LAUGH]. A: We also visited other places on the coast, but we decided to give St. Tropez a miss. B: That’s one place I’d like to go. A: I’ve heard it’s pretty grotty now, and crowded. B: Really ? Oh, well, maybe give it a miss then. Of course, there’s always the chance to see Brigitte Bardot there. A: Whatever turns you on.

  8. What’s the web like if you can’t see it? A point of view by Chieko Asakawa • Section 508 of the Rehabilitation Act: All federal agencies must make their info available to people with disabilities • How? • Screen readers, alt texts, skip-navigation links

  9. More and more images, with more and more “alt texts”

  10. What’s the web like if you can’t see it? “These days, Web pages are becoming larger and visually more complex using layout tables, images, colors and other visual effects. Thus, one page contains more various types of information than ever before. This means that blind users need to spend more time on one page to extract the information they need, since voice browsers (in this discussion, voice browser means both self-talking browsers and screen readers) present information serially using a text-to-speech (TTS) engine.” • (from Asakawa, 2005)

  11. Skip navigation link Alt text

  12. The irony: sometimes the very features meant to make the page more accessible actually makeit worse • Asakawa’s example of empty images used to space real images: With no alt text, these were invisible to her. With alt text added, she had to listen to lots of “spacer gif” readouts!

  13. Some ways of improving accessibility: • Guidelines, legislation, and standards • (skip links, content anchors, alt text, etc.) • Have sighted designers experience a web page as the blind do! • aDesigner - simulates blind experience • Estimates “reaching times” for key parts of page

  14. aDesigner Inaccessible parts are darkened

  15. Some ways of improving accessibility: • Guidelines, legislation, and standards • (skip links, content anchors, alt text, etc.) • Have sighted designers experience a web page as the blind do! • aDesigner - simulates blind experience • Estimates “reaching times” for key parts of page • “Intelligent” parsing of web pages (HearSay) • Treat form-filling as a kind of dialogue • See Tony’s fax form example • Include methods for repair and managing interruptions

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