Usability is the art of making sure that any kind of communication deliverable (e.g. a website, a handbook, a user guide, etc.) is intuitive, easy-to-use , and helps users achieve their goals. Usability is part of the broader discipline known as User Experience Design (or UX), which encompasses all aspects of the look, feel, and information contained in a communication deliverable. Usability testing, the process by which a communication deliverable is assessed, however, remains at the core of this discipline.