Specifications

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Physical Constraints
Physical constraints limit possible operations. The fact the
projector is attached to the ceiling limits the user to using the remote
control and not the control panel on the projector. The size of the
human hand limits the size of the remote control. The design of the
buttons apply some physical constraints the zoom, focus and volume
buttons can only be press in a vertical direction. The on-screen menu
has strict physical constraints the user can’t move the cursor in any
direction, the cursor is always on a certain selection.
Cultural Constraints
These are constraints that came about through cultural
conventions. On the remote control to increase the volume the user
presses up and to decrease the volume the user presses down. There
was nothing stopping the designers of the remote changing this
around except the cultural constraint that the increase volume button
is directly above the decrease volume button. To do otherwise would
cause annoyance for the user. Proxima have tried to replicate a
television remote control so that users feel comfortable using it. In
our evaluation we noticed that most users felt they would be unable to
use the projector before seeing the remote control but the fact that it
looks like a remote for a television they became more confident in
being able to accomplish the tasks.
Logical Constraints
Logical constraints are other constraints that are neither
physical nor cultural. None of the users had previously used a laser