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Ever got hopelessly lost on a website or not been able to perform what appeared to be a simple function? The survival of a website depends on the quality of its usability, which assesses how easy an interface is to use and whether it satisfies the needs of visitors: ‘If a website is difficult to use, people leave’ (Nielsen, 25 August 2003). The importance of usability in web design is underlined by Nielsen who says: ‘Usability rules the Web’ (Nielsen, 2000: 9). Web usability possesses the following five quality components relating to users: learnability efficiency, memorability, errors and satisfaction, although there are others, too (Nielsen, 25 August 2003). Findability through browsing, searching and asking, is critically important for overall usability (Rosenfeld and Morville, 2002: 5).

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