Usability Requirements
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[edit] Usability
Usability is an example of a non-functional requirement. It is a requirement that may not be explicitly be specified in a contract between the customer and the system developer, but it affects the general performance of the system and thereby its overall quality. It may therefore also be known as a quality factor.
Other examples of non-functional requirements are: reliability, portability, maintainability, testability, efficiency and integrity.
As with other non-functional requirements, usability cannot be directly measured but must be quantified by means of indirect measures or attributes such as, for example, the number of reported problems with ease-of-use of a system.
