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We first began looking at pointing devices and human performance in
1990 when the senior author, Sarah Douglas, was asked to evaluate
the human performance ofa rather novel device: a finger-controlled
isometric joystick placed under a key on the keyboard. Since 1990
we have been involved in the development and evaluation ofother
isometric joysticks, a foot-controlled mouse, a trackball, and a
wearable computer with head mounted display. We unabashedly believe
that design and evaluation of pointing devices should evolve from a
broad spectrum of values which place the human being at the center.
These values include performance iss ues such as pointing-time and
errors, physical issues such as comfort and health, and contextual
issues such as task usabilityand user acceptance. This book
chronicles this six-year history of our relationship as teacher
(Douglas) and student (Mithal), as we moved from more traditional
evalu ation using Fitts' law as the paradigm, to understanding the
basic research literature on psychomotor behavior. During that
process we became pro foundly aware that many designers of pointing
devices fail to understand the constraints of human performance,
and often do not even consider experimental evaluation critical to
usability decisions before marketing a device. We also became aware
ofthe fact that, contraryto popularbeliefin the human-computer
interaction community, the problem of predicting pointing device
performance has not been solved by Fitts' law. Similarly, our
expectations were biased by the cognitive revolution of the past 15
years with the beliefpointing device research was 'low-level' and
uninter esting."
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