Submitted on: 24 July 2007.
Revised on: 29 October 2007.
Accepted on: 11 December 2007.
___________________Australasian Journal of Educational Technology
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Submitted on: 19 April 2014.
Revised on: 10 July 2014.
Accepted on: 28 August 2014.
___________________Australasian Journal of Educational Technology
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