Work Sampling - Work Measurement.

The Industrial Engineering Terminology Standard (ANSI Z 94.12) defines work sampling as “an application of random sampling techniques to the study of work activities so that the proportions of time devoted to different elements of work can be estimated with a given degree of statistical validity.”The technique can be applied to humans, machines, or any observable state or condition of an operation.The underlying assumption of work sampling is that the sampling percentage of any observed state of nature estimates the actual time spent in that condition.

Work sampling with performance rating can be used in manufacturing, service organizations, and government for cost-effective work measurement.The technique is particularly useful for the following:

● Determining allowances
● Determining machine and equipment and/or facility utilization
● Production standards for indirect and support personnel
● Production standards for long-cycle, higher-production-quantity operations
● Development of standard data

Work sampling can be used for determining production standards for automated processes.

For limited production runs, lower accuracy and greater error limits are designed into the study.

This reduces the number of observations (and time) required to complete the study. Common guidelines for the confidence interval and error limits are 95 percent and plus or minus 5 percent, respectively.However, in all work sampling applications, the engineer must use judgment about the activity or state being observed and the overall accuracy requirements to determine the correct confidence interval and error limits.


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