The Essential Guide to User Interface Design
An EPSS Interface that people can use
Speaking Metaphorically
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CIO Magazine: "An effective metaphor makes a site or system intuitively obvious to the new user by providing comfortable and familiar surroundings that help users quickly absorb the content of a site or adapt to the rules of a system. Take the shopping cart used in online stores, which helps ground users by providing a brick-and-mortar object for them to relate to." (2001-01-01)
The link address is: http://www.cio.com/archive/010101_platform.html
