Yasashii Nihongo (Easy Japanese) — Turning Disaster-Response Research into a Nationwide Plain-Language Design Standard

Yasashii Nihongo ("Easy Japanese") is a controlled, simplified form of Japanese — short sentences, common vocabulary, furigana readings, restrained use of honorifics — developed after the 1995 Great Hanshin-Awaji (Kobe) earthquake, when it emerged that foreign residents were killed and injured at disproportionately high rates because emergency warnings assumed native-level Japanese fluency. Sociolinguist Satō Kazuyuki of Hirosaki University led the founding research, finding that disaster information given in simplified Japanese was understood by a substantially higher share of foreign residents than the same information in English or Chinese, since Japanese is the one language nearly all long-term foreign residents share some exposure to, unlike any single foreign language.

The approach moved from disaster-response research into a general design standard for inclusive public communication. By June 2018 it was in official use by all 47 Japanese prefectural governments. In 2020 Japan's Immigration Services Agency and Agency for Cultural Affairs published joint national guidelines formally standardising its rules. It has since been built into digital tooling: automated conversion services such as Tsutaeru Web adapt existing web pages into Easy Japanese, readability-analysis tools score vocabulary and kanji complexity of draft text, and municipalities including Hamamatsu, Kumamoto and Yokohama apply it to school communications, administrative guidance and, increasingly, disaster and public-service portals. The NPO e-board produces educational videos with Easy Japanese subtitles that had drawn more than 1.5 million views across 100-plus partner institutions by March 2024, and NHK's long-running "News Web Easy" service republishes daily news in the same simplified register.

Adoption and awareness are tracked, not just assumed. As of 2024, cited survey data put awareness among Tokyo residents at 48% (up 7 percentage points year-on-year), while 92% of surveyed foreign residents had heard of Yasashii Nihongo and 80% said they wanted more information delivered this way — evidence that the demand side of the practice is real and still growing three decades after its origin, even as awareness among the general Japanese-speaking public remains well under half.

Read the full analysis: https://www.bousai.go.jp/kyoiku/gensai/index_en.html