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 | | For the Metcard machine: What you (as user) have to do is press the various buttons to specify what kind of ticket you want to purchase, and then insert a sufficient amount of money into the coin slot, take your ticket, and collect your change if any. |
 | | : If you know something about how the Metcard system works, then you’ll know that specifying what kind of ticket, 2-hour, daily, short-trip, etc., is part of what the machine needs to be told, and will therefore connect this action with achieving your goal of buying a ticket. |
 | | Also, with a Metcard machine, the interface is to some extent limited by the requirement that it be very robust against vandalism. |
| www.cs.mu.oz.au /371/stun-08-4ht/stun-08.html (2173 words) |
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