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As the network and information technology continues to develop , site availability and scholars from various countries have been more and more valued by website developers , usability design web design has become an extremely important part . Meanwhile, the rapid development of Internet , the website construction by leaps and bounds , while the type of site , but there is no clear division standard , making it difficult for certain types of sites , respectively, carry out specific usability design and analysis . In this context , this paper presents the concept of functional sites that provide specific services to the user for the purpose , unique features specific website. Realization of the function of these sites significantly affected by availability issues , and therefore functional website usability studies is imperative. This paper mainly functional usability design principles specific detailed analysis , aimed at deepening the researchers and website developers website usability awareness and understanding , enhance functional website usability , help provide better service functions can be implementation. Thesis, theory and practice using a combination of research , first in integration of existing theoretical studies based on the combination of understanding on the usability of the site and thinking , to establish a Web usability principles of universal design , and in this framework, on the basis of on the functional characteristics of the site for the proposed functional website usability design a set of principles , and finally through usability testing approach to comparative analysis of the way these principles are verified , further confirmed these principles of science and effectiveness of the relevant research and work to provide strong scientific evidence and standards, to help achieve functional website usability design . According to these principles can know, in order to achieve functional website usability design , to meet the usability based on the principles of universal design should also be strengthened in two ways : from the page functional point of view , should be to achieve \prominent websites main function , reduce excess visual noise ; site content from the point of view , it should be from the search , navigation , content, effective , functional design meets user awareness four areas are discussed strengthening the services provided by the website features effective and available , a final and comprehensive achieve functional website usability design .
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