Wikipedia includes all texts from the US Library of Congress: Country Studies Japan (Public Domain) website. While the texts are of good quality, they were written around 1992, so some of the information is outdated. Since the Japanese asset price bubble collapsed in 1993, especially the articles on Economy need a review. See #List of recent events. You can help wikipedia by updating these articles.
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How to contribute
Pick an article / a topic
try to find up-to-date information on the topic (see #Sources) on the internet, in newspapers or in your library. Check official government sites for statistics
If you find a possible source, but you can't read the language, post it on the talk page and we'll find a translator
update the article
or
check the Wikimedia Commons for pictures, check Wikisource for sources
proofread
wikify and check links
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clean up
search for other wikipedia articles where the loc articles can be linked
http://www.oecd.org/ - OECD homepage - has up-to-date statistics and background information on many issues. Texts are copyrighted; statistics can be quoted