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CSA4080: Adaptive Hypertext Systems II

Explore adaptation techniques in hypertext systems, including stages, collaborative user modeling, problems, solutions, and adaptive presentation. Learn about adaptive navigation technologies and systems like Letizia, WebWatcher, and HyperContext.

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CSA4080: Adaptive Hypertext Systems II

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  1. CSA4080:Adaptive Hypertext Systems II Topic 7: Adaptation Techniques Dr. Christopher Staff Department of Computer Science & AI University of Malta 1 of 15 cstaff@cs.um.edu.mt

  2. Aims and Objectives • Review of stages in the adaptation process and adaptation techniques from CSA3080 • Adaptive navigation in Letizia, WebWatcher, and HyperContext 2 of 15 cstaff@cs.um.edu.mt

  3. Stages in the Adaptation Process • Collect data about the user • Process data to build/update user model • Apply user model to provide the adaptation • Last stage always fully automated in adaptive hypertext systems • 1st and 2nd stages may require user intervention. Ideally, fully automated 3 of 15 cstaff@cs.um.edu.mt

  4. Stages in the adaptation process • If user and system need to co-operate to achieve adaptivity, then it is called collaborative user modelling From [Brusilovsky96] 4 of 15 cstaff@cs.um.edu.mt

  5. Problems Revisited • Lost in HyperSpace • Cognitive overload • Complexity of the search space • Search-browsing • Static hypertext structure 5 of 15 cstaff@cs.um.edu.mt

  6. Generic solutions • Adaptive Presentation • Adaptive Navigation 6 of 15 cstaff@cs.um.edu.mt

  7. What can be adapted? • A hypertext is a collection of nodes that are connected by links • So what can be adapted? • The node content and user interface - adaptive presentation • The node organisation and hyperspace representations (e.g., index, map, overview) - adaptive navigation 7 of 15 cstaff@cs.um.edu.mt

  8. Adaptation Technologies 8 of 15 cstaff@cs.um.edu.mt

  9. Adaptive Navigation • Adaptive Navigation-local reconnaissance is highly related to link annotation • E.g., Letizia, WebWatcher, Personal WebWatcher, HyperContext • Already talked about Personal WebWatcher in Topic 4 (User Modelling) and CSA3080 9 of 15 cstaff@cs.um.edu.mt

  10. Adaptive Navigation • Differences in ITS and generic approaches to adaptive navigation • ITS aim is to transfer knowledge efficiently by guiding through a learning space • Learned, ready to be learned, not ready to be learned • Generic aim is to guide user through document space to relevant information (that is ideally also at the level of simplicity required by user!) • Relevant, not relevant (what about “related to interest X?”) 10 of 15 cstaff@cs.um.edu.mt

  11. Adaptive Navigation • Letizia • Predicts a user’s interest as the user browses and suggests links to relevant document in the vicinity of the user’s current location • User tends to traverse Web graph “downwards”, but relevant information may lie sideways • Observes user behaviour to determine user interests (eg, “skipping” links, bookmarking...) • Makes recommendations based on “persistence of interest” lieberman95letizia.pdf 11 of 15 cstaff@cs.um.edu.mt

  12. Adaptive Navigation • WebWatcher • Guides users through a web site based on interaction with past users • Users express a query and are guided to relevant documents • Associates what users are interested in with documents that they mark as relevant • Marks up links with terms used by users, and terms that occur in “downstream” documents webwatcher.ijcai97.pdf 12 of 15 cstaff@cs.um.edu.mt

  13. Adaptive Navigation • HyperContext • Uses Information Retrieval-in-Context to guide users to information in hyperspace (up to 7 link traversals away) • Once user has navigated to a location which probably contains information, can submit query to search “context sphere” • With Adaptive Information Discovery, system generates query on behalf of user HCTCh5.pdf 13 of 15 cstaff@cs.um.edu.mt

  14. Adaptive Presentation • Already described MetaDoc’s Stretchtext functionality in CSA3080 • Approaches are generally intended to make the content more understandable to the user • automatically including glossary explanations of terms unknown to the user • removing extraneous information, or information known to the user • showing information in format preferred by user... 14 of 15 cstaff@cs.um.edu.mt

  15. Summary • Reminded ourselves of the problems that AHSs try to fix • The adaptation process • Adaptation technologies • Examples of systems that incorporate adaptive navigation techniques 15 of 15 cstaff@cs.um.edu.mt

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