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Maurice Hendrix, A3H AH2008, 29/07/2008 A meta level for LAG Adaptation Language.

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Presentation on theme: "Maurice Hendrix, A3H AH2008, 29/07/2008 A meta level for LAG Adaptation Language."— Presentation transcript:

1 Maurice Hendrix, A3H Workshop @ AH2008, 29/07/2008 maurice@dcs.warwick.ac.uk http://www.dcs.warwick.ac.uk/~maurice A meta level for LAG Adaptation Language re-use in education

2 Outline LAOS Limitations of LAG Solution Proposed extension System setup of extension

3 LAOS 5 layer model for AH authoring: Domain model (DM) Goal and constraints model (GM) Adaptation model (AM) User models (UM) Presentation model (PM) AH Authoring: LAOS

4 Authoring now: DM & GM Several tools like MOT (My Online Teacher) Efforts to automate part of the process Can easily be done by teachers without CS background Content can be reused and transported easily e.g. via CAF and (recently) e- learning standards

5 Example DM authoring

6 Authoring AM Either pre-prepared strategy or programming knowledge required Re-use possible, but not very flexible, (DM/GM needs to be set-up for specific strategy) In LAOS AM is authored using LAG, programming language like

7 Example AM authoring (LAG Language) initialization( PM.next = true PM.ToDo = false PM.menu = true while true ( PM.GM.Concept.show = true UM.GM.Concept.beenthere = 0 ) UM.GM.begnum = 0 UM.GM.intnum = 0 ….

8 Limitations of LAG Inherent run-time limitations. No access to all items during run-time Thus no Access to set of metadata (labels and weights) and concepts in use Combined strategies have to share metadata fields

9 Examples of Limitations Beginner – Intermediate – Advanced type strategy with arbitrary knowledge level groups defined by authors metadata (weight & label). Course on general domain identifying the users more specific topic of interest using metadata (labels) Integration of multiple strategies (currently forced use of same metadata field is a problem)

10 Solution Access to the set of weights and labels (the metadata) at compile-time often enough Propose extension to LAG language to allow compile-time access to set of label/weights & regular expression matching as metadata share mechanism

11 Proposed extension XML format for the additions Easy to implement and maintain Can cope with changing LAG Adding like statement capturing labels with reg expr

12 DTD

13 Example while UM.GM. _number += 1 )

14 System setup of extension

15 Conclusion & Further work Using a simple pre-processing some limitations of LAG can be overcome Next in line is building a prototype, integrated with advancing LAG developments Conceptual Adaptation Model (CAM) of the Grapple project

16 Thank you for your attention Questions?


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