In Web page design, a design – evaluation of iterative design process is adopted to improve Web usability. The traditional usability engineering emphasizes the precise definition of Usability metrics. Whiteside and etc provides a set of quantitative metrics. According to the principles of usability metrics, Melody Y. Ivory provide a tool which called Webtango , Webtango explores automated approaches for helping designers improve their sites. It’s goal is to create an interactive tool that helps steer occasional website builders away from bad designs and toward better ones — a “quality checker” tool analogous to a grammar checker in a word processor. This design-checking approach is not intended to replace usability testing, but rather to complement it.
With quantitative methods, it analyzes and measures the information, navigation, presentation and etc. Ed It. Chi, Peter Pirolli and James Pitkow present an architecture and system for the quantitative analysis and prediction of user behavior and website usability. Simulation has also been used for Website evaluation. Chi, Pirolli, and Pitkow have developed a simulation approach for generating a site’s navigation paths based on content similarity, server log data, and linking structure.
Other automated critique tools, such as KRI/AG tool (knowledgebased review of user interface)  and IDA (user interface design assistance), perform rule-based interface critiques. HTML code validation can adopt validation service provided by the W3C. W3C provides validation service for HTML and XHTML markup in http://validator.w3.org/, and provides validation service for CSS in http://jigsaw.w3.org/css-validator/. According to the specific error messages through validation, amend Web pages, fully improve the degree of Web page standard, consequently to enhance their usability.
The Web interface is a specific HCI interface, and Web application is the special interactive system. The usability is important for successful websites. The Web design should focus on website’s users to enhance its usability. Web design must directly face “users with the specific needs”, and must ensure that users are pleasant to successfully complete tasks with Web. Web design usually adopts a design – evaluation iterative design process to improve its usability.
Web usability design includes the following three main elements: research users, Web design, and usability evaluation. Based on the above research, this paper concludes the specific methods for Web usability design as follows: under the guidance of user-centered design, fully understand the content of Web design, learned to design ideas of other areas; determine the features and functions of websites, through researching the user goals, views and behaviors with persona; construct a reasonable Web information framework; follow the general principles of navigation design, optimize Web interface, write for the way users read on the Web, build reasonable search in internal website, follow the Web standards, in order to construct self-described Web user interface with high-usability; Web evaluation is a measuring means for iterative process of Web usability design.