Industrial Engineering and Production Management
The assumption in PERT is

Cost of project will always be more than the estimated cost, if no timely corrections are taken
Activities are fixed and can't be changed
A project can be subdivided into a set of predictable, independent activities
A project will always be behind schedule, if left uncorrected

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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

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
All variables and constants are known and form a linear equation

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

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

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