時間研究における測定値の個人差について

Abstract

Stop watch study is the most commonly used method of measuring work in industry. While it has several advantages, it can not escape from unevitable observation variables due to the follwing two factors. (1) Measuring condition/environment. (2) Personal equation, i. e, reading errors by analyst. In this study I tackled with the subject (2) under the condition where reading variables will be minimized at its best. Further, with the assumption that the reading variable is subject to individual differences of analyst in both physical and given external factors, I also selected homogeneous analysts in view of age, sex, experiences in time study, and others. The study does not prove any other factors to influence the reading error than those I carefully avoided at the time of relecting analysts due to lack of ample samplings. It is found that the deviations and errors by different analysts are subject to differences in judgeing the starting and ending of mechanized proccesses which comes to be much difficult yet important under the persent tendency of high degree of mechanization. Thus, this study endorced one of the important principles that as a premise in stop watch study analysts should be thoroughly accquainted with the work to be observed.