ABSTRACT
Consider the following scenarios. Insurance company claims processors sit at
workstations in which the task lights shine into their eyes while they work on
their computers. When they turn them off, they have trouble seeing the docu-
ments they are working from. Technical support staff for a manufacturing firm
need to refer to manuals to reply to customers’ questions, but these heavy
volumes are located in an adjacent room. They have made so many photo-
copies of this material that their small desks are overflowing with paper.
