
Web usability can be defined as an efficient and easy to use web design aspect for visitors. Web usability means designing for users instead of for yourself or your client. A website that complies with user expectations makes visitors more comfortable and more likely to visit again. Websites with good usability is essential to site’s success.
This site is dedicated to providing information about web design and website development and how to make websites more usable, useful and accessible .We have provided set of usability guidelines for user-centered design.
User-Centered design (UCD) is a designed product development methodology that involves users throughout all stages of web site development, in order to create a web site that meets users' needs. It is an approach for carrying out usability which considers an organization's business objectives and the user's limitations, needs and preferences.
It is important to recognize that usability is not a one-dimensional property of a user interface. Web site usability is a combination of factors including:

Websites should be designed and developed by considering several usability-related issues, methods, and procedures. The most important ones are including ’up-front’ issues such as setting clear and concise goals for a Website, determining a correct and exhaustive set of user requirements, ensuring that the website meets user’s expectations, setting usability goals, and providing useful content.
A key factor in designing web sites is to facilitate and encourage efficient and effective human-computer interactions. Reducing the user’s workloads using computer’s capabilities is effective. Some benefits that users take over well designed web sites are directly usable format display of information as well as organized contents. The speed of loading a page is an important factor and users should be provided with appropriate feedback while waiting. Users should be easily able to print information. Designers should make sure to avoid unnecessary windows or graphics to users.

All web sites should be designed to ensure that it facilitates all users including people with difficulties such as hearing, seeing and making precise movements.
Some of the main accessibility issues to be dealt with include:
• Provide text equivalents for non-text elements
• Ensure that scripts allow accessibility
• Provide frame titles
• Enable users to skip repetitive navigation links
• Ensure that plug-ins and applets meet the requirements for accessibility; and
• Synchronize all multimedia elements
Where it is not possible to ensure that all pages of a site are accessible, designers should provide equivalent information to ensure that all users have equal access to all information.

All Web pages should be structured for ease of conception. Items should be displayed according to important relevance aligned on top and centre of the page. The designers should make sure that they follow this rule of thumb that sometimes “less is more”. It is also important to ensure that users are able to scrolling up/down.
When a Web page contains style text, choosing appropriate line lengths is important since users tend to prefer shorter line lengths. Another main issue is the length of the page. It is a good idea to use frames to keep the table of contents readily accessible and visible in the left panel if page content or length dictates scrolling and the page's table of contents needs to be accessible.
The method used to find information within a web site is called Navigation which is used mainly to help users locate and link to destination pages. A Web site’s navigation features should allow users to find and access information effectively and efficiently. When possible, designers should keep navigation-only pages short. Including site maps and effective feedback on the user’s location within the site are key factors for designers.
Navigation’s design includes different type of elements including appropriate menu types which facilitate navigation. Using descriptive tab labels, providing a clickable list of page contents on long pages, as well as adding ‘glosses’ where they will help users select the correct link are important factors. By all means an excellent designer should avoid dead-end pages.
Designers must decide on the length of the page, early in the design process. This decision will be based on considerations of the primary users and the type of tasks being performed. For example, older users scroll more slowly than younger users; therefore, long scrolling pages may slow them down considerably.
Generally, designers should use the option of scrolling and paging as efficient as possible. If unable to decide, providing several shorter pages is preferable to couple of long pages. This can be determined using the usability testing.
Most users spend a considerable amount of time scanning rather than reading information on Web sites. Designers should strive to use unique and descriptive headings, and to use as many headings as necessary to enable users to find what they are looking for—it is usually better to use more rather than fewer headings. Headings should be used in their appropriate HTML order, and it is generally a good idea not to skip heading levels.
Providing links means clicking on a hypertext link on a page and to be directed to the target page. Meaningful link labels, providing consistent clickability cues and designating when links have been clicked should be considered while designing links.
The most important part of a web site is content. The value of a well designed website get defined by it’s contents. In order to accommodate multiple audiences, designer should make sure that the information is clearly organized. Content should be formatted to facilitate scanning, and to enable quick understanding. Organizing content includes putting critical information near the top of the site, grouping related elements, and ensuring that all necessary information is available without slowing the user with unnecessary information
The following issues should be considered when conducting usability testing
Generally, the best method is to conduct a test where representative participants interact with representative scenarios:
The tester collects data on the participant’s success, speed of performance, and satisfaction. The findings, including both quantitative data and qualitative observations information, are provided to designers in a test report. Using ’inspection evaluations,’ in place of well-controlled usability tests, must be done with caution. Inspection methods, such as heuristic evaluations or expert reviews, tend to generate large numbers of potential usability ’problems’ that never turn out to be actual usability problems
The major consideration is to ensure that an iterative approach is used. After the first test results are provided to designers, they should make changes and then have the web site tested again. Generally, the more iterations, the better the Web site.
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