mode-specific buttons can be replaced with mode-specific gestures, ones that relate to the
function they perform. For instance, starting your hand above your head then dropping it down
quickly, as if you were starting a foot race, would start the stopwatch. Resetting the timer could
simply be a vigorous shake of your wrist.
After those improvements we are left with an LCD display surrounded by a mode-switching ring,
and time-setting knob and one button to turn on the back-light.
3.1 Cost Estimation
It’s safe to say that the major cost of the improvements will come from research and
development of the control gestures required to operate the new watch. The control gestures
are untested and they must be developed until they are perfected so the user experience is
improved and not made worse.
Design new time control knob: 100 working hours X $40/hr salary = $4000
Design mode switching knob: 100 working hours X $40/hr salary = $4000
Develop control gestures: 1000 working hours X $40/hr salary = $40000
TOTAL: $44,000
(Estimate of $40 per staff hour from http://www.spiritsoftworks.com/resources/2004_salary_survey.pdf)