Specifications

44
of the main areas in which the projector failed to accommodate users.
Even when the users stood behind the projectors they had problems
getting a response due to the narrow angle at which the remote
sensors picked up a signal from the remote.
Although the users of our evaluation knew which button to
press to alter the volume it took many of them a number of attempts
at pressing the volume button to succeed. The pointer button that
moves the on-screen cursor is also difficult to control. Users had a lot
of problems trying to navigate through the menu using it. When a
user wants to move to the left for example they can easily move the
cursor down instead. The reason the pointer button is like this is
because it can be used for the digital zoom and as a mouse (although
the projector we evaluated was not set up to be used as a mouse).
The pointer button doesn’t do this very well. Users found it hard to
control the zoom; it was either too sensitive to their actions or not
sensitive enough.
The on-screen menu was unnecessarily small, these reduced
the physical affordance offered to the user. When the users needed to
change the brightness the two arrows beside the current value for
brightness were very close beside each other users were often unable
to get the cursor on beside the desired arrow.
Sensory Affordance
Sensory affordance helps the user sense something usually
cognitive and physical affordances. For example the font of a label on
a button helps the user read it while what is written on the label is the
cognitive affordance.