In 2007 Ishikawa Harima Industries (IHI) experienced large profit overstatements (and subsequent downward revisions) caused by overly-optimistic estimates used in percentage-of-completion accounting for large projects. At the bottom of the link below, you can see IHI’s explanation of the incident, and the actions it took for years afterwards in order to improve its internal controls and accounting:
http://www.ihi.co.jp/csr/english/2011/management/governance.html
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.