[Usability - Wikipedia](https://en.wikipedia.org/wiki/Usability) > **Usability** can be described as the capacity of a system to provide a condition for its users to perform the tasks safely, effectively, and efficiently while enjoying the experience. > In [[ソフトウェア工学|Software Engineering]], usability is the degree to which a software can be used by specified consumers to achieve quantified objectives with effectiveness, efficiency, and satisfaction in a quantified context of use. (1.  Ergonomic Requirements for Office Work with Visual Display Terminals, ISO 9241–11, ISO, Geneva, 1998. 1. **[^](https://en.wikipedia.org/wiki/Usability#cite_ref-3 "Jump up")**) 国際規格ISO 9241-11]では > 特定のユーザが特定の利用状況において，システム，製品又はサービスを利用する際に，効果，効率及び満足を伴って特定の目標を達成する度合い。