Analysis Of Mental Workload With NASA-TLX Method On Employees Of Kareb Bojonegoro Cooperative

The human body is designed to perform daily work activities that allow humans to be able to move the body and perform. The presence of muscle mass whose weight is almost more than half the weight of the body, allows us to be able to move and do work. NASA – TLX is a widely used assessment tool, at the time of assessing perceived workload to assess the effectiveness of tasks, systems, or teams or other aspects of performance. This method is in the form of a questionnaire developed based on subjective measurement needs that are easier but more sensitive to workload measurement. Based on the calculation results in table 5 on employees of the KAREB Bojonegoro Cooperative outlet, it can be seen that the highest NASA-TLX score was obtained by respondents with the initials WA with a score of 82, while the lowest score was obtained by respondents with the initials MR with a score of 41.33. Based on the results of determining the category, it can be seen that as many as 1 respondent is categorized as having a very high workload, while 14 respondents are categorized as having a high workload, while 10 respondents are categorized as having a medium workload. The age attribute consists of 7 respondents aged 17 – 25 years, 14 respondents aged 25 – 40 years, 4 respondents aged 41 – 55 years. From the results.


INTRODUCTION
The human body is designed to perform daily work activities that allow humans to be able to move the body and perform.The presence of muscle mass whose weight is almost more than half the load of the body, allows us to be able to move and do work.Work on the one hand has an important meaning for progress and improvement of achievement, so as to achieve a productive life as a life goal.On the other hand, work means that the body will receive loads from outside its body.In other words, every job is a burden for those involved.(Soleman 2011) Workload measurement is one of the factors needed by companies to determine the workload of their employees.Because workers are one of the important factors in the process that affect the quality of each job, this physical and mental activity has consequences, namely the emergence of the workload contained in each employee.The research that will be carried out leads to the mental workload on employees who are in the KAREB Bojonegoro Cooperative This research was conducted at the Bojonegoro KAREB Cooperative which is engaged in tobacco drying service midwives, this research will be conducted on employees of the Bojonegoro kareb cooperative by measuring the mental workload experienced by each employee.This study used the NASA-TLX method which was used later in each measure of mental workload, using questionnaires in the form of employee respondents who were at the Bojonegoro KAREB Cooperative

METHOD
NASA -TLX is a widely used assessment tool, at the time of assessing perceived workload to assess the effectiveness of tasks, systems, or teams or other aspects of performance.This method is in the form of a questionnaire developed based on subjective measurement needs that are easier but more sensitive to workload measurement.Using a multidimensional assessment procedure, NASA -TLX achieved an overall workload score based on a weighted average of six subscale scores.(Hancock, 1998) The NASA-TLX method is a method used to analyze the mental workload faced by workers who have to perform various activities on their job.This method was developed by Sandra G. Hart of NASA-Ames Research Center and Lowell E. Staveland of San Jose State University in 1981 based on the emergence of subjective measurement needs consisting of a scale of nine factors (task difficulty, time pressure, type of activity, physical effort, mental effort, performance, frustration, stress and fatigue).From these nine factors, it is simplified again to 6, namely Mental demand (MD), Physical demand (PD), Temporal demand (TD), Own Performance (PO), Effort (E), Frustation level (FR).NASA-TLX (Nasa Task Load Index) is a method of subjectively measuring mental workload (Table 1.).The measurement of the NASA-TLX method is divided into two stages, namely the comparison of each scale (Paired Comparison) and the assignment of values to the work (Event Scoring).(Pradhana and Suliantoro 2018).

Weighting
In this section, respondents were asked to circle one of two indicators that were perceived to be more dominant, causing a mental workload on the work.The NASA-TLX questionnaire is provided in a paired comparison format and consists of 15 paired comparisons.From this questionnaire, an overall score is calculated for each indicator that is considered the most influential.The total score is the weight of each indicator of mental load.

Calculating Product Value
At this stage the product value is obtained by multiplying the weight and rating given by respondents, so that it will produce the product value of each indicator.

Figure
Figure 1.Rating

Table 1 NASA -TLX Indicators
(Arasyandi and Bakhtiar 2016)ate the six indicators of mental load.The score given is subjective and depends on the mental load experienced by respondents To get the NASA -TLX mental load score, the weight and score of each indicator are multiplied, then added up and divided by 15 (the number of paired comparisons.(Arasyandiand Bakhtiar 2016) The value 15 is the number of pairs -pairs of weights like the tableabove 100 JISTE (Jurnal Sistem Informasi, Teknologi dan Rekayasa), Volume 1, No. 3, pp.95-103 Score = Ʃ Nilai Produk 15