Introduction
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x
Avoid windows or other bright light sources that could cause reflections on the host and
display monitors. The grey walls highlighted in Figure 1-1 are locations where bright light
sources will cause reflections.
x
Supply sufficient light in the room. The best way to light the room is with ceiling-mounted
fluorescent lights, above and no more than two meters behind the computer monitors.
Painting the walls light colors or white will maximize ambient light as well.
x
Avoid environmental distractions. Be sure the room can be kept quiet, that no distracting
items are viewable by the participant, and so on. It is a good idea to ensure that the
participant cannot see the host monitor without turning their head (discourage this).
x
Supply a comfortable, stable chair for the participants. It should not wobble or move when
sat in, and the back should be firmly attached to the seat - springiness encourages some
participants to rock forwards and back. A chair with a concave back also discourages
shifting of the body, as does a high back. The top of the chair back should be just below the
shoulders on an average participant. Finally, make sure participants can enter and leave the
chair easily, as the chair will be close to the table with the Display PC monitor.
