https://tokkatsuglobaledu.jimdofree.com/
https://globaledumulti.jimdofree.com/
http://www.mext.go.jp/english/
http://www.tim.hi-ho.ne.jp/zentokkatu/
http://wwwsoc.nii.ac.jp/tokkatsu/
http://www.geocities.jp/dokkatsu_katarukai/index.html
http://www.lessonresearch.net/
(Note) English translation for organizations are tentative, and were translated by the writers of this homepage (as of June 2012), with the exception of those written as the (official name).