Modelling eLearning systems: UML v CHAT

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Modelling eLearning systemsUML v CHAT

• Dr Angela Trikic
• angela.trikic_at_ntu.ac.uk

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Aim

• Outline attributes of Activity Theory
• Consider role of signs and sign systems
• Describe and review CHAT notation
• Illustrate UML for modelling activity systems

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Is this a useful endeavour?
Impact of Activity Theory on

• Studies of HCI and communities of practice
• Research activities
• Persistent usage of CHAT notation
• Importance of
• Utility of modelling languages.

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Attributes of Activity Theory

• Object-orientedness
• Internalisation and externalisation
• Tool mediation
• Development
• Signs and sign systems

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Derivation of Activity Triangle

S
R
Tool
S
R
X
Subject
Object
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Basic structure of activity
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UML modelling

• Background context
• Formal methods soft systems methodologies
• Assumptions underpinning UML modelling
• Continual evolution
• Periodic rupture/breakdowns/disaster
• Complexity

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Level 0 model of pharmacy professional
development eLearning system
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A Level 1 class model of a pharmacy professional
development e-Learning system
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A class model representing an instantiation of an
elearning programme

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Use case model
Use case model showing a learner view of
composite learning tasks contained in
understanding a supplementary prescribing scenario
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Use case model
Use case model showing a learner view of
composite learner events
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Dynamic modelling Activity Diagrams

• An Activity diagram representing the behaviour of
  a word search tool

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Reappraising CHAT notation
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Utility of UML
Capacity to

• Support planning and communication tasks
• Accommodate to changing needs
• Involve key participants throughout development
  process
• Reduce risk

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• Thank you
• Angela Trikic
• angela.trikic_at_ntu.ac.uk