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
Arrival and waiting times are known and can be grouped to form a waiting line model
Complete details of items in, waiting line are known

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Industrial Engineering and Production Management
The important file in making a PERT is

Length of arrow has nothing to do with time
No activity from any event can be started from preceding event till it is completed
All of the these
An event can't be accomplished until activities leading to it are completed

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