Useful key metrcis – warning signs – developed by GMI. Simple but effective!
http://www3.gmiratings.com/home/key-metrics-series/
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.