Usability - convenience and ease of use - the ability of the digital product to be intuitively understood, studied and used. This includes attractiveness to the user under specified conditions (ISO / IEC 25010); the attribute of a system, product or service, in which a particular user can operate the system under certain conditions to achieve specified goals with the required efficiency and satisfaction (ISO 9241-210).
Usability in mobile and web software development is a result of the software design stage, which provides users with convenient facilities for app interaction, software or websites.
Good usability requires that:
Direct evaluation is considered in the ISO 9241-11 standard, which assumes that the ergonomics of the system depends on all indicators affecting the operation of the system in real conditions, including both organizational indicators (for example, labor skills, location or appearance of products), and individual differences between users, for example, in the cultural level and preferences.
Indirect evaluation is considered in ISO / IEC 25010, which describes the following usability characteristics:
The best way to estimate the usability of the existing or new software is to implement the usability testing, inviting the real users to do the set of standard procedures as a test.