Performance Measure in Stop Watch by Fuzzy Logic

One of the most important subjects in the production field is time study that is the base of many decisions such as the determination of the number of operators and machines. A usual method in time study is using stopwatch method. In this method، after recording the observation times، a performance measure is allocated for it to determine the normal time and by adding the allowances to the normal time، the standard time is determined. In this process، a real performance measure has an effective role. So، some methods are developed for it. A usual method for determination the performance measure is Westinghouse method. Unfortunately، this method uses only certain data. However، in the real-world، the determination of exact and certain value for processing time is not possible. So، the results of the real-world situation specially in high volume production are different from the forecasting. In this situation، fuzzy logic can be used as an effective tool for solving this problem. So، in this paper we try to use fuzzy logic in the Westinghouse method for better time studying. Also، a numerical example is solved in details that can have the better results for these conditions.