時間研究における代表値に関する一考察

Abstract

In determining a standard time by way of direct time study method, on observed operation should be carried out in a stabled manner, i.e, with minimum variation. In order to meet this requirment, any values of extraodinal nature should be omitted in calculation. However in reality, penatration of various factors which makes an operation be unstable is unevitable, and segration of such data is beyond a practice. This paper suggests a practical approch by plotting accumulated mean values for a certain period of time, and then select a range of such values when a curve comes to be stablized. There are several different patterns in an accumulated mean values and different treaments are suggested accordingly.