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

All variables and constants are known and form a linear equation
The laws governing arrivals, service times, and the order in which the arriving units are taken into source are known
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 study is mainly aimed at

Economizing the motions involved on the part of the worker while performing a job
Determining the most efficient method of performing a job
Developing the standard method and standard time of a job
Establishing the minimum time of completion of a job

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