Industrial Engineering and Production Management
The reasons which are basically responsible for the formation of a queue should be that

Output rate is linearly proportional to input
The average service rate Hess than the average arrival rate
Output rate is constant and the input varies in a random manner
All of these

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

Arrival and waiting times are known and can be grouped to form a waiting line model
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
All variables and constants are known and form a linear equation

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