The education of the lower secondary school in France which corresponds to the Period of Integrated Study has been developed as a project study with the keyword “interdisciplinarité” from the end of last century. Its successor EPI (Interdisciplinary Practical Learning) starting from 2016 -2017 school year was planned as an effective learning approach for the French situation like declining academic performance. Japan, which showed the high performance in the PISA survey, seems to be oriented the more advanced one, with expecting that the school plan and the curriculum management is required to be more strictly executed. But there are uneasy factors to deepen the learning. Although the effectiveness of interdisciplinarité in France is still controversial, the French style that the specialty of the subject teacher in charge is utilized seems firm from the viewpoint of how to develop the class to deepen the learning.