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Usability.gov—usability basics with focus on web usability; Evaluating Websites for Accessibility—accessibility is a crucial subset of usability for people with disabilities. This W3C/WAI suite includes a section on involving users in testing for accessibility. Usability News from the Software Usability Research Laboratory at Wichita State ...
Usability includes methods of measuring usability, such as needs analysis [3] and the study of the principles behind an object's perceived efficiency or elegance. In human-computer interaction and computer science, usability studies the elegance and clarity with which the interaction with a computer program or a web site (web usability) is
Web accessibility, or eAccessibility, [1] is the inclusive practice of ensuring there are no barriers that prevent interaction with, or access to, websites on the World Wide Web by people with physical disabilities, situational disabilities, and socio-economic restrictions on bandwidth and speed.
Universal usability; Usability engineering; Usability lab; Usability of web authentication systems; Usability goals; Usability testing; Usable security; Usage-centered design; Use error; Use-centered design; Useable; User analysis; User interface design; User journey; User persona; User-centered design
Usability guidelines recommend a default font size of at least 12 points (about 16 pixels, but pixels are evil). Reducing text size causes usability issues: The first usability issue to consider is readability. An extensive number of usability studies were made about the impact of text size on readability.
Provide documents in nonstandard formats, such as PDF and Flash, only as an alternative to accessible html. Harry Hochheiser and Ben Shneiderman have also developed the Universal Usability Statement Template, which describes a Web site's content, browser requirements, network requirements, and other characteristics that may influence its usability.
For the definition part, Matera, Rizzo &Carughi's Article in Web Engineering suggests Web usability can be defined as the ability of Web applications to support target web tasks with effectiveness, efficiency, and satisfaction.
Common points between accessibility and usability: Internationalization (usability) is related to indicating language changes (accessibility). Highly contrasted texts/links/etc. improves readability for everyone (usability); notably elders, visually impaired, etc. (accessibility). Explicit link titles benefit to everyone.