MOT meets AHA

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MOT meets AHA!

• Alexandra Cristea, Davy Floes, Natalia Stash
• and Paul De Bra
• acristea, nstach, debra_at_win.tue.nl,
  d.floes_at_student.tue.nl
• http//wwwis.win.tue.nl/alex/

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Overview

• Motivation
• Theoretical framework LAOS
• The sources to merge
• MOT
• AHA!
• Transformation steps
• Conclusions

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Why are AHS not so popular yet?

• complexity of authoring task
• absence of good authoring tools
• difficulty in re-usage
• absence of expressive structural overview
  possibility
• complicated adaptation model
• possibility of gradual, iterative extension not
  developed
• possibility of authoring cooperation not really
  taken into consideration
• lack of standardization of adaptive behaviour in
  adaptive (educational) hypermedia

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Overview

• Motivation
• Theoretical framework LAOS
• The sources to merge
• MOT
• AHA!
• Transformation steps
• Conclusions

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What is LAOS ?

• a generalized model for generic adaptive
  hypermedia authoring
• based on the AHAM model
• based on concept maps
• http//wwwis.win.tue.nl/alex/HTML/Minerva/papers/
  WWW03-cristea-mooij.doc

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LAOS components

• domain model (DM),
• goal and constraints model (GM),
• user model (UM),
• adaptation model (AM) and
• presentation model (PM)

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Overview

• Motivation
• Theoretical framework
• The sources to merge
• MOT
• AHA!
• Transformation steps
• Conclusions

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Interface AHA!
Domain model autom. generation
The five level AHS authoring model.
Goal constraints model (lesson)
3-layer AM (NEW!!)
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Transformation elements

• Transformation of DM layer
• Transformation of GM layer
• Transformation of UM layer
• Transformation of AM layer
• Transformation of PM layer

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Transformation of domain model

• DM in MOT (cf LAOS) contains a hierarchy of
  concepts their respective attributes.
• Also (typed, weighted) relations between the
  concepts, other than the hierarchical ones.
• DM Elements appear in adaptation only if more
  info (than in GM) is needed.
• 2 cases attributes from DM or relations in DM

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AHA! And MOTs DM

• AHA! 2.0 conditional inclusion of fragments,
  which are parts of an (xhtml) page.
• So (xhtml) pages have to be generated for the
  AHA 2.0 engine.
• If some attribute of some concept appears in
  more than one condition, it has to be pasted as a
  conditional fragment in each of the (xhtml) pages
  in which it could appear (so redundancy!!).
• Relations within DM layer have no real equivalent
  at the moment in AHA 2.0.

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Transformation of goal constraints model

• GM - similar elements to DM ?similar
  transformations.
• major difference (weighted) AND-OR relations,
  which can be directly interpreted as prerequisite
  relations, allowed by the AHA! engine.
• But also, e.g., as knowledge updates. Again,
  these relations would have to be translated into
  (xhtml) pages that AHA! understands.

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Transformation of Adaptation Model

• lowest adaptation level (If-Then rules) are
  stored in MOT in a MySQL database
• the interface to AHA! has to generate xhtml
  rules
• knowledge updates and
• prerequisite relationships.

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Conclusions

• briefly presented MOT, an AHS authoring system,
• based on LAOS, a five-layer AHS authoring model
• Focus to integrate MOT with the AHA! system
• main issue how to keep the MOT expressivity and
  still obtain the translation into AHA! ?
• possible solutions
• to generate multiple AHA! presentations,
  depending on some initial triggers in MOT.
• to respond with custom generation of AHA!
  compatible format.