AN INVESTIGATION INTO SOME ASPECTS OF THE ACCURACY OF PREDETERMINED MOTION TIME SYSTEMS

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Abstract
The analytical procedure of predetermined motion time systems is based on the premise that time standards can be determined by adding elemental times, fixed once and for all and conceived as universally applicable. Consequently, it was the aim of the experiments to investigate whether this “additivity of elemental times” can be considered sufficiently accurate in practice. Experiments proved that influences exist, due to the effect of the motion “Gestalt”, which make the presumed additivity of elemental times questionable. However, it is also demonstrated—at least as far as the experiments reported are concerned—that, on the one hand, it appears impossible to allow for such influences in practice since they vary from one person to the next, and that on the other these influences may be considered, in many cases, to be of little significance in relation to other factors. Finally, some general theoretical considerations concerning the overall accuracy of the predetermined motion time systems are presented. From the curves developed it is suggested that even greater inaccuracies in the elemental times will, in many cases, lead to total times of satisfactory validity.

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