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Usability is the degree of ease with which products such as software and Web applications can be used to achieve required goals effectively and efficiently. Usability assesses the level of difficulty involved in using a user interface. Although usability can only be quantified through indirect measures and is therefore a nonfunctional requirement, it is closely related to a product's functionality.
Usability assessment generally includes studies of the clarity of websites and computer programs. These studies are conducted by usability analysts. When a product is deemed to be have good usability, this means it is easy to learn, and efficient and satisfying to use.
Usability design considers who the users are, what they know and how they learn, users' general backgrounds, and the context in which they use a given product. It also considers whether users accomplish the tasks at the desired speed, the training required to use the program, supporting materials available to help users, the chance of recovery from errors and the program's ability to meet the needs of disabled users.
Usability is based on three design principles:
There are several methods that can be used to evaluate usability: