A Walk-up-and-use system is a system that needs to be so self-explanatory that first-time or one-time users can use the system effectively without any prior introduction/training.
Examples are automatic teller machines (ATMs), ticket machines, public informations systems, museum displays, etc.
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As a rule, software systems do not work well until they have been used, and have failed repeatedly, in real applications.
-- Dave Parnas
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Eva Hornecker explains the evolving concept of Tangible Interaction.
Read Eva's insightful entry here..