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MyUltralase (top right and right sidebar). This site registration facility again shows the online value 

proposition. This is intended to encourage a deeper relationship and return visits.

Elements of site design

Once the requirements of the user are established we can turn our attention to the design of 

the  human–  computer interface. Nielsen (2000a) structures his book on web usability accord-

ing to three main areas, which can be interpreted as follows:

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Site design and structure.

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Page design.

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Content design.

Today, the increasing importance of mobile design means that designing for mobile 

devices is a key consideration, so we have added a separate section on design for mobile 

platforms.