The document discusses key aspects of usability as it relates to user experience (UX). It defines usability as a measure of how effectively, efficiently, and satisfactorily users can use a product to achieve goals. The document outlines several ways to design for optimal usability, including understanding user goals, mimicking the real world, limiting options, and thorough testing. It also describes the three main outcomes of a usable interface as easy first contact, ability to achieve objectives, and easy recall on subsequent visits.
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