Determination of the Optimal Number of Workers Usingthe NASA-TLX Method in Chemical Company, Indonesia

Abstract

This study aims to analyze the workload of operators and analyze the optimal number of workers to complete work on the part of the production. The research was conducted at one chemical company in Indonesia and this study uses a method NASA -Task Load Index (NASA-TLX) of the six indicators to measure mental workload with the NASA-TLX method, namely mental needs, physical needs, time requirements, performance, level of frustration, and physical and mental effort obtained mental workload calculations on production operators as many as 4 operators experience mental workload categories very high, 13 operators with mental category workloads are high, 2 operators experience mental workload categories rather high, and 1 operator experiences mental workloads with moderate categories. Of the 4 work shift groups, all experienced a high mental workload so that an additional workforce was needed to reduce operator workload. After adding 1 operator in each group, the level of mental workload decreased to a rather high level. But of the 4 work shift groups, there is still 1 shift group that experiences high workloads despite having added 1 workforce.