A GUI interface is user-friendly. But designing good GUI gets really sticky. Lots of steps go into making that interface, and it's easy to get bogged down or messed up. This matrix gives you a punchlist of steps to make that GUI design the best ever.
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"It is an important and popular fact that things are not always what they seem. For instance, on the planet Earth, man had always assumed that he was more intelligent than dolphins because he had achieved so much -- the wheel, New York, wars and so on -- whilst all the dolphins had ever done was muck about in the water having a good time. But conversely, the dolphins had always believed that they were far more intelligent than man -- for precisely the same reasons."