Each test session started with an introduction to the test application
and the four interaction techniques - the users were educated on
how to use evaluated metaphors; they could also select orientation
technique for joystick and mapping for position control technique
(see previous section). The introduction was followed by a training
session (one practice tasks for each interface) to allow the subjects
to get familiarized with the test procedure. After the subjects indicated
that they were satisfied, we proceeded with the actual trials.
We decided to use two types of tasks (based on [1]) representing
various conditions a user is likely to experience using a 3D map
application while being in the street level: