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The construction industry is a sector where human resources are used intensively, and work accidents related to falling from height occur mostly. In the construction industry, studies are generally carried out to determine and prevent the physical workload of the work done. However, it is necessary to measure mental workload and make improvements to keep this workload at an optimum level to prevent work accidents and performance losses. In literature, NASA-TLX (National Aeronautics and Space Administration Task Load Index) method is widely used to evaluate the mental workload of workers. Uncertainty arises in the calculation process of NASA-TLX since this method is subjective, and the rating values of workload dimensions included are expressed in linguistic terms. For this reason, to eliminate uncertainties and obtain more accurate results, fuzzy set theory can be used. In this study, the Fuzzy NASA-TLX …