Abstract
It is effective to divide the sequence of events for vocational training instructor candidates and so on to understand history of a law related to the vocational ability. A concept of self-help co-aid public-assistance is taken up, and it's separated by whether it was the dominant of the three concepts. In the texts and composition of the law, it inclined toward public-assistance until a legal revision in 1985, but co-aid became superior around that time. And the weight of self-help increased by a legal revision in 2007, and it is interpreted a balance of 3 concepts was planned for. It is certain that the amendment in 1985 and 2007 is an epoch legally but it is also necessary to pay attention these changes are somewhat continuous. In addition, consideration is given to the relationship between these categories and the internal labor market and external labor market.
https://ror.org/01e3mhx02 
