Methods engineering combined with motion and time study seems to play an important role for finding the economical way of performing the operation, standardizing the operation, and determining the time standard in industry. Motion time engineers sometime believe that the design or analysis of various industrial machines or tools should be determined by the application of methods engineering. However, they only concentrate their attention on the time factor in relation of man to machine, and not on the ratio of input to output of man-machine relationship.
So far as man-machine system, a minimal work unit, is concerned, the design of equipment should be evaluated not only in speed but in other ways, accuracy, comfort, safety and muscular force, so that the operator of such equipment will not be stressed beyond his physiological and psychological capabilities.
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