Understand what functions the system should have.
If there are no real users or tasks… think again, there probably
are!
Jeff Hawkins, the inventor of the Palm Pilot, was said to
have carried a small block of wood around in his shirt pocket
… As various everyday situations arose, he would take out the
block of wood and imagine how he would use the device.
The same technique can be used to evoke a response from expected
end-users