ユーザビリティ

Also known as useability, product usability, easy-to-use, user-friendly, user-friendliness, ease of use, userfriendliness, intuitiveness

Usability or user-friendliness 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 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.