Evaluating the Accuracy of the MOST Predetermined Motion Time System through Lab Experiments.

Abstract: Ensuring the reliability of time estimations is vital for industries, as it establishes the basis for effective planning, resource allocation, and performance assessment, ultimately improving operational efficiency and optimizing workflows. This study, designed to evaluate the accuracy of the MOST predetermined motion time system (PMTS) through comprehensive laboratory experiments, involved twenty participants performing 300 various simple motions. Our focus was on motions characterized by specific features, such as those at higher levels (shoulder height), motions involving objects with varying weights, and motions occurring within the reach distance zone (between 5 cm and 60 cm from the workers). These motion characteristics are often overlooked in MOST data cards. Task durations were initially measured using an accelerometer and then estimated using both the MOST and Fitts' Law (a widely recognized method for estimating the duration of simple motions). The results unveiled a 22% underestimation of MOST estimations by Fitts’ Law. These findings underscore the need to revise MOST data cards for accuracy enhancement and to mitigate potential risks to workers. Future research endeavors should incorporate real-world scenarios and a broader array of motions to further validate and refine these outcomes, ensuring a more comprehensive understanding of the capabilities and limitations of the MOST predetermined motion time system.

Keywords: Predetermined motion time system (PMTS), Fitts’ law, MOST, Validation study, Laboratory experiment

DOI: 10.54941/ahfe1005157

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