There is a great page on the CGD site I think you should see.  Here is the link:

http://www.cgdev.org/content/publications/detail/2844

いいいいいいいいいいいいいいいいいいいいいいいいいいいいい
To unsubscribe/subscribe or view archives of postings, go to the Gambia-L Web interface
at: http://listserv.icors.org/archives/gambia-l.html

To Search in the Gambia-L archives, go to: http://listserv.icors.org/SCRIPTS/WA-ICORS.EXE?S1=gambia-l
To contact the List Management, please send an e-mail to:
[log in to unmask]
いいいいいいいいいいいいいいいいいいいいいいいいいいいいい