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Adaptive Hypermedia

Explore the innovative adaptive techniques discussed in the Universal Web Accessibility Symposium 2000 that aim to provide enhanced access to web content for all users. Topics include conditional text filters, stretchtext, frame-based approaches, adaptive multimedia, direct guidance, hiding, sorting, and link annotation.

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Adaptive Hypermedia

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  1. Adaptive Hypermedia John M.D. Hill Curtis A. Carver Jr. Universal Web Accessibility Symposium 2000

  2. Agenda • Introduction • Adaptive Techniques • Adaptive Systems • Future Work • Conclusion Universal Web Accessibility Symposium 2000

  3. Introduction • Universal web accessibility and adaptive hypermedia are fundamentally interlinked. You cannot provide universal web accessibility unless you adapt web presentation and navigational systems to the user. A system is not truly adaptive if it does not adapt to all of its users. Universal Web Accessibility Symposium 2000

  4. More! Adaptive Hypermedia Techniques Adaptive Multimedia Adaptive Text Adaptive Presentation Adaptive Technologies Direct Guidance Adaptive Sorting of Links Adaptive Hiding of Links Adaptive Annotation of Links Map Adaptation Adaptive Navigational Support 4 Universal Web Accessibility Symposium 2000 October 31, 2000

  5. Conditional Text Filters • Conditional text filters are a 'divide and adaptively present' technique. • The information within the hyperspace is divided into components. • Each component has an associated user model state and is only visible if the user is at the appropriate level within the user model. Universal Web Accessibility Symposium 2000

  6. Adaptive Hypermedia Architecture Universal Web Accessibility Symposium 2000

  7. Adaptive Stretchtext • Adaptive stretchtext is similar to a hyperlink but instead of the link opening a new page, the text of the link is replaced. • Stretchtext can be expanded or collapsed to provide as much or as little information as necessary. • Hypermedia information can be presented with all, some, or none of the stretchtext expanded depending on the user model. Universal Web Accessibility Symposium 2000

  8. PUSH Universal Web Accessibility Symposium 2000

  9. Frame-based Approaches • Frame-based adaptation uses a frame to present information about a concept. • Each frame is divided into slots and the information presented in each slot and the order in which the system presents information is adapted based on the user model. • Frame-based adaptation is a very common adaptation technique. Universal Web Accessibility Symposium 2000

  10. AVANTI Universal Web Accessibility Symposium 2000

  11. Adaptive Multimedia Presentation • Adaptive multimedia presentation systems alter the presentation of multimedia elements based on the user model. • It is similar to conditional text filters except multimedia information is adaptively sorted and presented instead of text. Universal Web Accessibility Symposium 2000

  12. CS383 Universal Web Accessibility Symposium 2000

  13. Direct Guidance • Direct guidance is the most restrictive form of adaptive navigation support. Users are presented with a single adaptive link. • For example, when taking an adaptive exam, the 'next question' button will link to different questions based on the user's previous performance on the assessment. Universal Web Accessibility Symposium 2000

  14. RATH Universal Web Accessibility Symposium 2000

  15. Hiding • Hiding is the most common technique for adaptive navigation support. • Links are adaptively hidden so that users cannot access components of the hypermedia system until the user model decides that the user is ready for that information. Universal Web Accessibility Symposium 2000

  16. ISIS-Tutor Universal Web Accessibility Symposium 2000

  17. Map Adaptation • Map adaptation alters the mapping of image components to different links depending on the user model. • While the user is presented with the same image, the destinations of clicking on components of the image change based on the user. Universal Web Accessibility Symposium 2000

  18. Sorting • Adaptive sorting orders the links on a page according to the user model so that the most pertinent links for the user are presented first. • With an accurate user model, the user need only work sequentially down the list of links to retrieve information. • The user retains the capability to overrule the adaptive model and selectively use the information presented as appropriate. Universal Web Accessibility Symposium 2000

  19. InterBook Universal Web Accessibility Symposium 2000

  20. Link Annotation • Link annotation uses textual or verbal cues to suggest to the user which links to visit in which order. Links may have different icons, be color-coded, or have different font sizes or font types to distinguish between types of links. • The annotation used is adaptively changed based on user actions. Universal Web Accessibility Symposium 2000

  21. ELM-ART Universal Web Accessibility Symposium 2000

  22. AHA ARNIE AVANTI BASAR CHEOPS CS383 CAMELEON ELM-ART EPIAIM HyperTutor I-DOC InterBook ISIS-Tutor ITEM/IP MediaDoc MetaDoc Personal web Watcher PUSH RATH Adaptive Systems Universal Web Accessibility Symposium 2000

  23. System Conditional Text Filters Stretchtext Frame-based Approach Adaptive Multimedia Direct Guidance Hiding Sorting Link annotation AHA    Arnie   AVANTI     Basar   CHEOPS  CS383   Chameleon   ELM-ART   EPIAIM  Hyperflex  HyperTutor   Adaptive Systems and Techniques 23 23 Universal Web Accessibility Symposium 2000 October 31, 2000

  24. System Conditional Text Filters Stretchtext Frame-based Approach Adaptive Multimedia Direct Guidance Hiding Sorting Link annotation InterBook    ISIS-Tutor    ITEM/IP    MediaDoc    MetaDoc  WebWatcher    PUSH     RATH   Adaptive Systems and Techniques 24 24 Universal Web Accessibility Symposium 2000 October 31, 2000

  25. Future Work • Multidimensional User Models • Fine-grained Multimedia Presentation • Open Adaptive Hypermedia Systems • Constructive Adaptive Hypermedia Universal Web Accessibility Symposium 2000

  26. Conclusion • For a copy of this slideshow, links to referenced systems, and a survey paper on adaptive hypermedia systems, see http://206.96.207.5/curt/papers.htm and click the Speaker/Panel presentations bookmark. Universal Web Accessibility Symposium 2000

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