Germany's Commission on its CG Code recommended that supervisory boards not only increase the number of women, but also take the internationality of business into account when appointing board members (meaning, consider appointing more foreigners or persons with foreign experience).
http://bdti.mastertree.jp/f/5k28j4x0
(Readers may wish to refer to the other entries on board diversity and international composition, below.)
The Board Director Training Institute (BDTI) is a "public interest" nonprofit in Japan dedicated to training about directorship, corporate governance, and related management techniques. It is certified by the Japanese government to conduct these activities as a regulated nonprofit. Read a summary about BDTI here, and see a menu of its services for both corporations and investors here.