No population stereotype relating direction of movement of a thumbwheel switch and the increase or decrease of the number it displays was found in a test with ninety subjects, half of whom were instructed to change the setting from 2 to 4 (increase setting), the other half from 4 to 2 (decrease setting). In the interest of uniformity, upward-to-increase is recommended as the preferred human engineering practice. A recommendation is also made to decrease required torque and to increase the accessibility of the gripping surface.
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References
1.
BakerC. A.GretherW. F.Visual presentation of information.WADC Technical Report 54-160, 1954