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With its origins dating back only to the second half of the twentieth century, Computer Science can be considered a very young discipline. The widespread adoption of the "Personal Computer" is even more recent. Introduced in the 1970s, its ascendancy was recognised by Time Magazine as recently as 1983 ( Time Magazine 1983 ). As a logical consequence, the study of User Interface design for computing devices is even younger. Indeed the idea of a Graphical User Interface (GUI) is quite a novelty: it is possible to trace a clear evolution from a non-graphical interaction by means of physical devices (punchcards and readers) to the CLI (Command Line Interface), where you type instructions that the computer will execute, and finally to the recent advent of the GUI and its WIMP (Windows, Icons, Menus and Pointing device) paradigm. So recent indeed is this development that a number of crucial key concepts and theories that govern their use were conceived a long time before an actual implementation would become feasible. The word "hypertext," for example, was coined by Theodor Nelson, who later worked at a Hypertext Editing System at Brown University, in the mid sixties (see Nelson 1965 ).