l
lHuman-factors
variables
l speed of motion for short and
long distances
l accuracy of positioning
l error rates
l learning time
l user satisfaction
lOther variables
l cost
l durability
l space requirements
l weight
l left- versus right-hand use
l likelihood to cause
repetitive-strain injury
l compatibility with other
systems
lSome results
l direct pointing devices
faster, but less accurate
l graphics tablets are
appealing when user can remain with device
for long periods without switching to keyboard
l mouse is faster than
isometric joystick
l for tasks that mix typing and
pointing, cursor keys a faster and are preferred by users to a mouse
l muscular strain is low for
cursor keys