Some firms have neglected their legal requirement to report job-related accidents involving contract temporary workers to the labor authority. Others have left such workers without social security coverage. The practice must be stopped. But simply treating these workers fairly as temporary workers, as they actually are, won’t be enough. Employers should consider offering permanent jobs to as many of them as possible.
http://www.asahi.com/english/Herald-asahi/TKY200608260115.html