Submitted on: 25 October 2006.
Revised on: 08 February 2007.
Accepted on: 20 February 2007.
___________________International Journal of Education and Information Technologies
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Submitted on: 08 September 2018.
Revised on: 14 October 2018.
Accepted on: 02 November 2018.
___________________International Journal of Education and Information Technologies
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