Abstract – ”Japan’s high corporate savings might be holding back growth. We focus on the causes and consequences of the current corporate behavior and suggest options for reform. In particular, Japan’s weak corporate governance—as measured by available indexes—might be contributing to high cash holdings. Our empirical analysis on a panel of Japanese firms confirms that improving corporate governance would help unlock corporate savings. The main policy implication of our analysis is that comprehensive corporate governance reform should be a key component of Japan’s growth strategy.”
http://www.imf.org/external/pubs/ft/wp/2014/wp14140.pdf
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.