This paper investigates the development of school system reform in the first years of past war Japan; whether the school system reform was carried out under the U.S. compulsion or not? Why the new school system was put into practices in less than two years after the War? These problems and others were taken into consideration. We have got conclusion as follows: 1. The U.S. was unwilling to force Japan to adapt the 6-3-3-4 system, though it took the initiative and played an active role in making the school system reform; most Japanese educators were in favor of adopting the 6-3-3-4 systems in theory. 2. The Ministry of Education of Japan played a comparatively minor part in the development of school system reform. The task was done by the Japanese educators working in close cooperation with the United States Education Mission to Japan and the American educational experts in the Civil Information and Education Section. 3. The Past War Japan’s economy was in an extremely difficult condition and the Japanese government had a strong intention to postpone the enforcement of the New School System. But with a great pressure from the U.S., they finally put it into practice in less than two years after the war. |