Reaction speed is the time needed to complete a sudden work. For example, security guards speed in ringing the alarm when signal lamp turns on. The carefulness shows the error number done per time unit. This is connected to movement when tracking.
A man–machine system means that man and machine have reciprocal relationship one to another. The main case in reciprocal relationship from man to machine and from machine to man, interaction is the most important. Ergonomically, interaction from man – machine system is:
a. Perception is all the information on display
b. Control is the operation as manual
In doing a work, errors will occur. Error percentage is the numbers of errors divided by total work.
Reaction speed test to the color is done in order to know man reaction time to the fast reaction. For example, the signals indicating fire alarm, supervisor instrument, etc.
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