Supplementary schools are one of the educational institutions for overseas Japanese children, along with full-time
Japanese schools and the overseas branch campuses of Japanese private schools. The supplementary schools are generally
open at the weekend, except for some cases. The original and primary educational objective of such schools is to help the
overseas Japanese children to maintain or improve their mother tongue (Japanese) and adjust themselves smoothly to the
Japanese school environment after returning home. More Japanese parents were inclined to send their children to local
schools in North America and Western Europe or international schools, slightly more than 50 percent of overseas Japanese
students of compulsory education age (6-15 years old) go to those different types of Japanese-speaking schools, and nearly
half of them study at supplementary schools. This shows that the supplementary schools have significant weight with
Japanese overseas education today. However, for the school management, to offer a Japanese standard of quality education
overseas is by no means an easy task, and this article argues that the schools are faced with a series of problems by
categorizing them into the three ”I”s -- insufficiency, instability, and inconsistency.