Define work measurement. What are the various methods of work measurement? Discuss work sampling.
The purpose of work measurement is to determine the time it ought to take to do a job. The problem is in the definition of "ought to." Work measurement analyst define this as the time it should take an experienced and well-trained operator to perform the job in a specific and well-defined method at a speed that can be maintained all day, day after day, without undue fatigue. This time, called standard time, can be divided into several parts: the actual elements used to perform the job; the rating factor used to determine the "normal" pace of these elements (the method used to determine the "ought to" time); and an allowance for personal time, unavoidable delays, and slowing due to fatigue.
There are four main systems of work measurement. First, and most used, is time study, specifically, stop-watch time study. Motion picture and video cameras, computers, and various production timing devices can also be used in the place of, and in conjunction with, the stop watch. The second system, work sampling, is a statistical procedure for measuring work and requires an understanding of the techniques of statistics and probability.
The third system, predetermined time systems (PDT), uses sets of tables of basic motions that
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