Industrial Engineering and Production Management
In queuing theory, the nature of the waiting situation can be studied and analysed mathematically if

The laws governing arrivals, service times, and the order in which the arriving units are taken into source are known
All variables and constants are known and form a linear equation
Complete details of items in, waiting line are known
Arrival and waiting times are known and can be grouped to form a waiting line model

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Industrial Engineering and Production Management
Work sampling is applied for

Estimation of the percentage utilization of machine tools
Finding out time standards, specially where the job is not repetitive and where time study by stop watch method is not possible
All of these
Estimating the percentage of the time consumed by various job activities

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