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10--Human Factors Engineering POPULATION STEREOTYPES-BEHAVIORAL RESPONSES CONTROL MOVEMENT & UP UP RECOMMENDED SYSTEM (OR EQUIPMENT COMPONENT) RESPONSE DIRECTIONAL NONDIRECTIONAL RIGHT FORWARD CLOCKWISE INCREASE* NOT recommends NRI RECOMMENDS NOT RECOMMENDS RECOMMENDS NOT RECOMMENDS) NOT RECOMMENDS) <$M SIGHT w(fcA FORWARD RECOMMENDED NOT RECOMMENDED RECOMMENDED RECOMMENDS RECOMMENDS NOT RECOMMENDS vtv NOT RECOMMENDS 1 RECOMMENDS HINOT RECOMMENDS) RECOMMENDS CLOCKWISE RECOMMENDS I RECOMMENDS) RECOMMENDS Mncrease refers to wcreoe in power output, brightness, vpmr rtc, and to "on" or "start" os opipoiod to "off" or "stop" Fig 10-12 --General population stereotype control expectancy When the control is moved as shown at left, most people expect a response as shown at right Additional stereotypes are shown in table on facing page Adapted from C T Morgan, et al Human Engineering Guide to Equipment Design New York, NY, McGraw-Hill Book Co 1963 trol design have emerged Compatibility. Just as in the design of dis plays, control movement should be designed to be compatible with the display and ma chine movement A lift truck, for example, that has the lift controls move nght to left to raise or lower the lift is bound to have a num ber of errors associated with its operation 232 Coding Whenever possible, all controls should be coded in some way A good coding system can reduce many errors by shape and texture, location, color, and operation A sum mary and comparison of various visual coding methods is piesented in Table 10-C Shape and texture Controls can be coded by their shape or their texture (see Fig