This document discusses user experience (UX) design. It defines usability as "the extent to which a product can be used by specified users to achieve specified goals with effectiveness, efficiency and satisfaction in a specified context of use." The document outlines key principles of usability including learnability, efficiency, memorability and satisfaction. It notes that great UX does not always mean good usability, and vice versa. The document provides examples of user profiles and sketches out a design for a meme generator app. It ends with links to additional UX resources.
9. Usability == ease of using
The extent to which a product can be used by specified
users to achieve specified goals with effectiveness,
efficiency and satisfaction in a specified context of use.
International Organization for Standardization