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

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
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

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Industrial Engineering and Production Management
Scheduling

Prescribes the sequence of operations to be followed
Regulates the progress of job through various processes
Is concerned with starting of processes
Determines the programme for the operations

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