1. Cabinet Office of Japan: Electronic Government Usability Guidelines (2009) (in Japanese),
http://www.kantei.go.jp/jp/singi/it2/guide/index_before090916.html
2. Nagano, Y., Utamura, S., Zempo, H.: Usability Requirements in Information System Development. In: The Proceedings of the 53rd Annual Conference of the Japan Ergonomics Society, p. 176 (2012) (in Japanese)
3. Sociomedia, Inc.’s: UI design patterns,
https://www.sociomedia.co.jp/category/uidesignpatterns
(in Japanese)
4. Okubo, R., Noda, H., Tanikawa, Y., Fukuzumi, S.: Development of Design Pattern for HI Design. NEC Giho 64(2) (2011) (in Japanese)
5. Software Engineering Center, Information-technology Promotion Agency. Non-Functional Requirement Grade Usage Guide, Japan (2010) (in Japanese),
http://sec.ipa.go.jp/reports/20100416.html