Submitted on: 02 September 2012.
Revised on: 25 December 2012.
Accepted on: 21 February 2013.
___________________International Journal of Knowledge and Learning
Submitted on: 11 February 2001.
Revised on: 13 May 2001.
Accepted on: 29 May 2001.
___________________International Journal of Knowledge and Learning
http://reply.papertrans.cn/2/137/13640/13640-23.png
http://reply.papertrans.cn/2/137/13640/13640-24.png
http://reply.papertrans.cn/2/137/13640/13640-25.png
Submitted on: 11 September 1998.
Revised on: 02 November 1998.
Accepted on: 18 December 1998.
___________________International Journal of Knowledge and Learning
http://reply.papertrans.cn/2/137/13640/13640-27.png
Submitted on: 09 January 2004.
Revised on: 03 February 2004.
Accepted on: 22 March 2004.
___________________International Journal of Knowledge and Learning
http://reply.papertrans.cn/2/137/13640/13640-29.png
Submitted on: 08 February 2016.
Revised on: 09 April 2016.
Accepted on: 26 May 2016.
___________________International Journal of Knowledge and Learning