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When you come to a new situation, how do you know what to
do?
Imagine yourself in each of these situations and walk through
a typical scenario.
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Use a new device or tool
* To calculate interest on a mortgage or car loan you
call up a calculator or widget. You have to know
the buttons to press and the meaning of the actions you
can perform.
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Get where you want to go in a complex topology of pages
*Find all the info on product X in a web site. Even
if you find some of the information how do you know if
you have found all of it?
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Plan or undertake a sequence of actions to accomplish
a goal
*Change the name of a directory.
Determine the size of a hard disk
The core problem is that in novel situations you need hints,
advice, enough constraint or a sufficiently intuitive
context of action to make it obvious what to do.
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