SCM general process, practices and tools are same in Japan as of used in the west or any other part of the country. Though the approach of practicing SCM may vary depending on the nature of project or product as well as the culture of the organization. I have an experience with the Japanese based clients and feel quite comfortable with the processes and practices.
Lastly, it is the SCM practitioners that needs to understand the trends of software development in particular organization and map the CM processes accordingly.
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